Engine Specs - S65 Rod Bearings

Rod Journal Dimensions

Crankshaft Rod Journals	Metric Dimensions	SAE (Inch) Dimensions
Rod Journal Dimensions	51.9811mm	2.04650 inch
Rod Journal Variance	51.9786 - 51.9887 mm	2.04640 - 2.04680 inch
Rod Journal Tolerance	-0.0025, +0.0076 mm	-0.00010, +0.00030 inch

Rod Bearing Clearance

Calculating Rod Bearing Clearance

Theoretical Clearance

The theoretical rod bearing clearance may be calculated in the following manner:

Abbreviation	Name	Description
JDmin / JDmax	Rod Journal (min/max)	Diameter of the connecting rod journal. Measurements will include the min/max variance.
BEBmin / BEBmax	Rod big-end bore (min/max)	Diameter of the connecting rod big-end bore. This is the housing which holds the rod bearings themselves. Measurements will include the min/max variance.
UPRmin / UPRmax / LWRmin / LWRmax	Rod bearing thickness: UPR=Upper shells, LWR=Lower Shells	Thickness of the upper and lower rod bearing shells, measured at 90-degrees. Measurements will include the min/max variance.
CTmin / CTmax	Rod bearing coating (min/max)	Thickness of the rod bearing coating, if any: 0, if no coating exists. Measurements will include the min/max variance.
CLRmin	Minimum Clearance	Calculated theoretical minimum clearance: = BEmin - JDmax - LWRmax - UPRmax - (2*CTmax)
CLRmax	Maximum Clearance	Calculated theoretical maximum clearance: = BEmax - JDmin - LWRmin - UPRmin - (2*CTmin)
CLRnom	Nominal bearing clearance	(CLRmin + CLRmax) / 2
CLRji	Clearance per journal-inch diameter	= CLRnom / ((JDmin + JDmax) / 2)

BMW Theoretical Clearance Specifications

The following clearance specifications come from BMW TIS. These are the official BMW specifications. <Link>

Crankshaft Rod Journal Clearance	Metric Dimensions	SAE (Inch) Dimensions
Minimum Clearance	0.010 mm	0.0004 inch
Nominal Clearance	0.022 mm	0.0009 inch
Maximum Clearance	0.034 mm	0.0013 inch

Bearings Specification, Dimensions, Clearance

OEM 088/089 Bearings

Production and Composition

BMW "088/089" bearings were the factory production bearings between 2007 to mid-2010. When the EU mandated the removal from lead in automotive bearings, BMW discontinued these bearings.

The composition is a standard babbit lead/copper bearing. They are soft faced, and easy on the crankshaft.

Manufacturer: Clevite. Clevite logo is seen on the back of the bearings.
Composition: Tri-metal lead/copper

Picture Description

Dimensions

Bearing Dimensions (088/089 Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue)	2.0028 mm	0.07885 inch
Nominal Bearing Thickness (Bottom, Red)	1.9977 mm	0.07865 inch
Bearing Thickness Variance (Top, Blue)	2.0015 - 2.0041 mm	0.07880 - 0.07890 inch
Bearing Thickness Variance (Bottom, Red)	1.9964 - 2.0015 mm	0.07860 - 0.07880 inch
Bearing Tolerance (Top, Blue)	-0.0013 - 0.0013 mm	-0.00005 - +0.00005 inch
Bearing Tolerance (Bottom, Red)	-0.0013 - 0.0038 mm	-0.00005 - +0.00015 inch

Bearing Clearance Specifications

Con Rod Clearance (088/089 Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0192 mm	2.04800 inch
Rod + Bearing Variance	52.0040 - 52.0319 mm	2.04740 - 2.04850 inch
Nominal Rod Bearing Clearance	0.0381 mm	0.00150 inch
Bearing Clearance Variance	0.0152 - 0.0533 mm	0.00060 - 0.00210 inch
Bearing Clearance Tolerance	-0.0229 - +0.0152 mm	-0.00090 - +0.00060 inch
Bearing Clearance per Journal inch		0.00073 inch/inch
Bearing Clearance per Journal Inch Variance		0.00029 - 0.00103 inch/inch
Bearing Eccentricity	0.0216 mm	0.00085 inch
Bearing Eccentricity Variance	0.0178 - 0.0229 mm	0.00070 - 0.00090 inch
Bearing Eccentricity Tolerance	-0.0038 - +0.0013 mm	-0.00015 - +0.00005 inch

Shell Measurements (088-Bottom)

nBearing	5°	10°	15°	25°	35°	45°	55°	65°	75°	85°	90°	95°	105°	115°	125°	135°	145°	155°	165°	170°	175°
1	0.07595	0.07635	0.07700	0.07755	0.07780	0.07800	0.07815	0.07830	0.07845	0.07850	0.07850	0.07850	0.07840	0.07830	0.07820	0.07805	0.07795	0.07765	0.07725	0.07670	0.07625
2	0.07625	0.07680	0.07720	0.07775	0.07795	0.07820	0.07830	0.07840	0.07850	0.07855	0.07855	0.07850	0.07840	0.07840	0.07835	0.07800	0.07785	0.07755	0.07695	0.07690	0.07635
3	0.07690	0.07695	0.07730	0.07765	0.07795	0.07810	0.07830	0.07840	0.07850	0.07860	0.07865	0.07855	0.07845	0.07835	0.07815	0.07810	0.07785	0.07770	0.07685	0.07690	0.07630
4	0.07610	0.07660	0.07710	0.07755	0.07780	0.07805	0.07825	0.07850	0.07850	0.07855	0.07855	0.07855	0.07845	0.07830	0.07825	0.07810	0.07790	0.07770	0.07730	0.07685	0.07610
5	0.07625	0.07660	0.07710	0.07765	0.07790	0.07805	0.07825	0.07835	0.07845	0.07855	0.07860	0.07855	0.07845	0.07830	0.07820	0.07800	0.07780	0.07755	0.07705	0.07675	0.07640
6	0.07605	0.07655	0.07715	0.07750	0.07775	0.07795	0.07815	0.07840	0.07855	0.07845	0.07845	0.07845	0.07850	0.07830	0.07815	0.07820	0.07805	0.07775	0.07725	0.07690	0.07645
7	0.07640	0.07695	0.07730	0.07770	0.07795	0.07815	0.07835	0.07845	0.07850	0.07855	0.07860	0.07855	0.07845	0.07840	0.07825	0.07810	0.07790	0.07775	0.07705	0.07695	0.07630
8	0.07615	0.07680	0.07730	0.07775	0.07795	0.07810	0.07825	0.07840	0.07845	0.07860	0.07855	0.07850	0.07840	0.07830	0.07815	0.07805	0.07790	0.07775	0.07720	0.07685	0.07640

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05070	2.05040	2.05035	2.05055	2.05060	2.05050	2.05035	2.05050
19.75	2.04860	2.04860	2.04880	2.04880	2.04880	2.04885	2.04885	2.04885
45.00	2.04815	2.04800	2.04840	2.04815	2.04830	2.04805	2.04835	2.04830
90.00	2.04785	2.04790	2.04795	2.04795	2.04800	2.04795	2.04800	2.04800
135.00	2.04800	2.04820	2.04820	2.04840	2.04820	2.04810	2.04840	2.04820
160.25	2.04860	2.04860	2.04880	2.04870	2.04885	2.04880	2.04870	2.04885
175.00	2.05060	2.05100	2.05035	2.05060	2.05055	2.05015	2.05050	2.05055
Clearance	0.00135	0.00140	0.00145	0.00145	0.00150	0.00145	0.00150	0.00150

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00285	0.00250	0.00240	0.00260	0.00260	0.00255	0.00235	0.00250
19.75	0.00075	0.00070	0.00085	0.00085	0.00080	0.00090	0.00085	0.00085
45.00	0.00030	0.00010	0.00045	0.00020	0.00030	0.00010	0.00035	0.00030
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00015	0.00030	0.00025	0.00045	0.00020	0.00015	0.00040	0.00020
160.25	0.00075	0.00070	0.00085	0.00075	0.00085	0.00085	0.00070	0.00085
175.00	0.00275	0.00310	0.00240	0.00265	0.00255	0.00220	0.00250	0.00255

Bearing Eccentricity: BMW Factory 088/089 rod bearings

OEM 702/703 Bearings

Production and Composition

EU mandates against lead/copper bearings began in 2011. However, S65 engines have been seen with mid-2010 production dates having these newer 702/703 bearings. These bearings remained in production until the end of S65 production in 2013.

The new 702/703 bearings are made from tin/aluminum/copper composition. The 702/703 bearings are substantially harder than the 088/089 bearings they replaced. As a consequence, when a bearing is spun, it tends to cause more damage to the crankshaft in the process.

Manufacturer: Glyco.
Bearing composition: Trimetal Aluminum

Picture Description

Dimensions

Bearing Dimensions (702/703 Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue)	1.9977 mm	0.07865 inch
Nominal Bearing Thickness (Bottom, Red)	1.9939 mm	0.07850 inch
Bearing Thickness Variance (Top, Blue)	1.9977 - 1.9990 mm	0.07865 - 0.07870 inch
Bearing Thickness Variance (Bottom, Red)	1.9939 - 1.9952 mm	0.07850 - 0.07855 inch
Bearing Tolerance (Top, Blue)	0.0000 - 0.0013 mm	0.00000 - +0.00005 inch
Bearing Tolerance (Bottom, Red)	0.0000 - 0.0013 mm	0.00000 - +0.00005 inch

Bearing Clearance Specifications

Con Rod Clearance (702/703 Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0192 mm	2.04800 inch
Rod + Bearing Variance	52.0179 - 52.0294 mm	2.04795 - 2.04840 inch
Nominal Rod Bearing Clearance	0.0381 mm	0.00150 inch
Bearing Clearance Variance	0.0292 - 0.0508 mm	0.00115 - 0.00200 inch
Bearing Clearance Tolerance	-0.0089 - +0.0127 mm	-0.00035 - +0.00050 inch
Bearing Clearance per Journal inch		0.00073 inch/inch
Bearing Clearance per Journal Inch Variance		0.00056 - 0.00098 inch/inch
Bearing Eccentricity	0.0508 mm	0.00200 inch
Bearing Eccentricity Variance	0.0444 - 0.0584 mm	0.00175 - 0.00230 inch
Bearing Eccentricity Tolerance	-0.0063 - +0.0076 mm	-0.00025 - +0.00030 inch

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05280	2.05290	2.05290	2.05280	2.05250	2.05260	2.05270	2.05290
19.75	2.05045	2.05035	2.05035	2.05020	2.05010	2.05020	2.05035	2.05035
45.00	2.04900	2.04880	2.04880	2.04920	2.04870	2.04890	2.04880	2.04890
90.00	2.04830	2.04815	2.04840	2.04820	2.04835	2.04830	2.04820	2.04820
135.00	2.04900	2.04890	2.04900	2.04885	2.04900	2.04890	2.04890	2.04885
160.25	2.05035	2.05045	2.05035	2.05020	2.05040	2.05040	2.05035	2.05020
175.00	2.05280	2.05300	2.05270	2.05280	2.05285	2.05290	2.05285	2.05300
Clearance	0.00180	0.00165	0.00190	0.00170	0.00185	0.00180	0.00170	0.00170

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00450	0.00475	0.00450	0.00460	0.00415	0.00430	0.00450	0.00470
19.75	0.00215	0.00220	0.00195	0.00200	0.00175	0.00190	0.00215	0.00215
45.00	0.00070	0.00065	0.00040	0.00100	0.00035	0.00060	0.00060	0.00070
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00070	0.00075	0.00060	0.00065	0.00065	0.00060	0.00070	0.00065
160.25	0.00205	0.00230	0.00195	0.00200	0.00205	0.00210	0.00215	0.00200
175.00	0.00450	0.00485	0.00430	0.00460	0.00450	0.00460	0.00465	0.00480

Bearing Eccentricity: BMW Factory 702/703 rod bearings

BE Bearings (Version-2): SP1527F

Introduction: February, 2022

Production and Composition

Manufacturer: Clevite
Composition: Tri-metal silver oxide
Part Number: SP1527F
Target Market: Extra clearance OEM replacement

BE Bearings are a full custom rod bearing designed and manufactured by Clevite. Clevite manufactures the bearings to the BE Bearing specifications.

The composition is a tri-metal design coated with silver oxide babbit. The surface feels a little rough compared to the previous lead-copper design which used the TriArmor PTFE (Calico) coating. The silver oxide provides better seizure resistance and 30% higher load capacity than previous designs. These bearings are compatible with stop-start vehicles.

Silver Oxide, Tri-Metal design Tri-Metal, silver oxide is considered the the "next generation" bearing design by Clevite. This new bearing was Clevite's answer to the Glyco IROX bearing design. This is the same bearing design used in the Dodge Hellcat engines. BE Bearings is the first aftermarket manufacturer to bring this new bearing design to the market. Clevite considers the new silver oxide bearing so superior, that they advise it has a wider tolerance spectrum in which the engine is still considered safe. The steel backing is coated with copper, then topped with a silver oxide.  The silver oxide is embeddable, meaning small particles can embed themselves in the surface without causing any damage to the crankshaft.

Used Oil Analysis (UOA) TBD.

Factory BMW oil recommendations There's a lot of discussion about the best for the S65/S85.  BMW specified 10W60 weight oil, and many people believe this is too thick for the bearing clearances.  Others believe BMW chose it for a specific engineering reason and refuse to switch regardless of the too-thin oil clearance.  For better peace of mind, BE Bearings wanted their bearing owners to know they can safely use 10W60 oil with their bearings, just as BMW had specified in the first place.

Silver Oxide coating The Silver Oxide coating is superior to the previous TriArmor PTFE (Calico) coating. Silver oxide provides better seizure resistance and 30% higher load capacity. To combat the issues with shell thickness inconsistency from Calico Coatings, BE worked with Clevite for nearly two years to bring this bearing to the market. It's ideally suited for the highest horsepower engines, ideally suited for start-stop engines, and protects the crankshaft and bearings at critical times of low oil pressure and/or during start up.

Picture Description

Standard (STD)

+0.025 MM, +0.001 INCH

Dimensions

Standard (STD)

Bearing Dimensions (BE Bearings Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	1.9876 mm	0.07825 inch
Bearing Thickness Variance (Top=Bottom)	1.9812 - 1.9939 mm	0.07800 - 0.07850 inch
Bearing Tolerance (Top=Bottom)	-0.0064 - 0.0064 mm	-0.00025 - +0.00025 inch

+0.025 MM, +0.001 INCH

Bearing Dimensions (BE Bearings Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	2.0003 mm	0.07875 inch
Bearing Thickness Variance (Top=Bottom)	1.9939 - 2.0066 mm	0.07850 - 0.07900 inch
Bearing Tolerance (Top=Bottom)	-0.0064 - 0.0064 mm	-0.00025 - +0.00025 inch

Bearing Clearance Specifications

BE Bearings (Clevite) Custom Rod Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0492 mm	2.04918 inch
Rod + Bearing Variance	52.0446 - 52.0548 mm	2.04900 - 2.04940 inch
Nominal Rod Bearing Clearance	0.0681 mm	0.00268 inch
Bearing Clearance Variance	0.0559 - 0.0762 mm	0.00220 - 0.00300 inch
Bearing Clearance Tolerance	-0.0122 - +0.0081 mm	-0.00048 - +0.00032 inch
Bearing Clearance per Journal inch		0.00131 inch/inch
Bearing Clearance per Journal Inch Variance		0.00108 - 0.00147 inch/inch
Bearing Eccentricity	0.0645 mm	0.00254 inch
Bearing Eccentricity Variance	0.0381 - 0.0965 mm	0.00150 - 0.00380 inch
Bearing Eccentricity Tolerance	-0.0264 - +0.0320 mm	-0.00104 - +0.00126 inch

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05620	2.05230	2.05570	2.05525	2.05490	2.05295	2.05500	2.05260
19.75	2.05265	2.05080	2.05260	2.05230	2.05205	2.05080	2.05180	2.05080
45.00	2.05050	2.04895	2.05000	2.04980	2.04980	2.04880	2.04940	2.04890
90.00	2.04940	2.04900	2.04920	2.04940	2.04910	2.04910	2.04925	2.04900
135.00	2.04920	2.04995	2.04880	2.04940	2.04950	2.05010	2.04920	2.05010
160.25	2.05090	2.05225	2.05080	2.05160	2.05130	2.05250	2.05160	2.05280
175.00	2.05180	2.05560	2.05205	2.05315	2.05310	2.05540	2.05375	2.05600
Clearance	0.00290	0.00250	0.00270	0.00290	0.00260	0.00260	0.00275	0.00250

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00680	0.00330	0.00650	0.00585	0.00580	0.00385	0.00575	0.00360
19.75	0.00325	0.00180	0.00340	0.00290	0.00295	0.00170	0.00255	0.00180
45.00	0.00110	-0.00005	0.00080	0.00040	0.00070	-0.00030	0.00015	-0.00010
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	-0.00020	0.00095	-0.00040	0.00000	0.00040	0.00100	-0.00005	0.00110
160.25	0.00150	0.00325	0.00160	0.00220	0.00220	0.00340	0.00235	0.00380
175.00	0.00240	0.00660	0.00285	0.00375	0.00400	0.00630	0.00450	0.00700

Bearing Eccentricity: BE Bearings SP1527F rod bearings

BE Bearings (Version-1): SP1527HK

Introduction: November, 2015

Production and Composition

Manufacturer: Clevite
Composition: Tri-metal lead/copper
Coating: Clevite TriArmor®
Part Number: SP1527HK
Target Market: Extra clearance OEM replacement

BE Bearings are a full custom rod bearing designed and manufactured by Clevite. Clevite manufactures the bearings to the BE Bearing specifications.

The composition is a standard babbit lead/copper bearing with additional Clevite Tri-Armor non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.

Lead/Copper, Tri-Metal design Tri-Metal, lead/copper are considered the world's best bearings.  The steel backing is coated with copper, then topped with a soft lead.  The lead is embeddable, meaning small particles can embed themselves in the lead without causing any damage to the crankshaft.  Look in the best automotive engines, and you're likely to find a Tri-Metal bearing design.

Used Oil Analysis (UOA) BE Bearings chose the Tri-Metal lead/copper bearings to track the metals in the UOA like Blackstone.  Owners with 2008-2010.5 vehicles still have the lead/copper bearings and can track their bearing life with the UOA.  The newer tin/aluminum BMW bearings are virtually untrackable in the UOA.  BE Bearings wanted their bearings to show up in the UOA, and another reason they chose the Tri-Metal, lead/copper design.

Factory BMW oil recommendations There's a lot of discussion about the best for the S65/S85.  BMW specified 10W60 weight oil, and many people believe this is too thick for the bearing clearances.  Others believe BMW chose it for a specific engineering reason and refuse to switch regardless of the too-thin oil clearance.  For better peace of mind, BE Bearings wanted their bearing owners to know they can safely use 10W60 oil with their bearings, just as BMW had specified in the first place.

Clevite TriArmor® coating For increased bearing life and durability, BE Bearings chose to add the Clevite TriArmor coating.  TriArmor is a low-friction coating offered directly from Clevite with a Clevite warranty.  It's ideally suited for start-stop engines and protects the crankshaft and bearings at critical times of low oil pressure and/or during start up.

Picture Description

Standard (STD)

+0.025 MM, +0.001 INCH

Dimensions

Standard (STD)

Bearing Dimensions (BE Bearings Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	1.9876 mm	0.07825 inch
Bearing Thickness Variance (Top=Bottom)	1.9812 - 1.9939 mm	0.07800 - 0.07850 inch
Bearing Tolerance (Top=Bottom)	-0.0064 - 0.0064 mm	-0.00025 - +0.00025 inch

+0.025 MM, +0.001 INCH

Bearing Dimensions (BE Bearings Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	2.0003 mm	0.07875 inch
Bearing Thickness Variance (Top=Bottom)	1.9939 - 2.0066 mm	0.07850 - 0.07900 inch
Bearing Tolerance (Top=Bottom)	-0.0064 - 0.0064 mm	-0.00025 - +0.00025 inch

Bearing Clearance Specifications

BE Bearings (Clevite) Custom Rod Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0408 mm	2.04885 inch
Rod + Bearing Variance	52.0344 - 52.0497 mm	2.04860 - 2.04920 inch
Nominal Rod Bearing Clearance	0.0597 mm	0.00235 inch
Bearing Clearance Variance	0.0457 - 0.0711 mm	0.00180 - 0.00280 inch
Bearing Clearance Tolerance	-0.0140 - +0.0114 mm	-0.00055 - +0.00045 inch
Bearing Clearance per Journal inch		0.00115 inch/inch
Bearing Clearance per Journal Inch Variance		0.00088 - 0.00137 inch/inch
Bearing Eccentricity	0.0419 mm	0.00165 inch
Bearing Eccentricity Variance	0.0229 - 0.0483 mm	0.00090 - 0.00190 inch
Bearing Eccentricity Tolerance	-0.0191 - +0.0063 mm	-0.00075 - +0.00025 inch

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05280	2.05200	2.05305	2.05190	2.05270	2.05290	2.05235	2.05225
19.75	2.05050	2.05040	2.05030	2.05030	2.05070	2.05055	2.05065	2.05025
45.00	2.04930	2.04910	2.04920	2.04935	2.04965	2.04940	2.04965	2.04940
90.00	2.04860	2.04885	2.04870	2.04900	2.04920	2.04875	2.04900	2.04885
135.00	2.04900	2.04930	2.04920	2.04940	2.04910	2.04910	2.04930	2.04920
160.25	2.05010	2.05050	2.05045	2.05065	2.05010	2.05010	2.05000	2.05005
175.00	2.05315	2.05205	2.05280	2.05290	2.05260	2.05270	2.05250	2.05190
Clearance	0.00210	0.00235	0.00220	0.00250	0.00270	0.00225	0.00250	0.00235

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00420	0.00315	0.00435	0.00290	0.00350	0.00415	0.00335	0.00340
19.75	0.00190	0.00155	0.00160	0.00130	0.00150	0.00180	0.00165	0.00140
45.00	0.00070	0.00025	0.00050	0.00035	0.00045	0.00065	0.00065	0.00055
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00040	0.00045	0.00050	0.00040	-0.00010	0.00035	0.00030	0.00035
160.25	0.00150	0.00165	0.00175	0.00165	0.00090	0.00135	0.00100	0.00120
175.00	0.00455	0.00320	0.00410	0.00390	0.00340	0.00395	0.00350	0.00305

Bearing Eccentricity: BE Bearings vs. stock 088/089 vs. stock 702/703 rod bearings

Mahle Motorsport

Introduction: April, 2023

Production and Composition

Manufacturer: Mahle Motorsport, Scotland
Composition: Tri-metal VP2 85-Rockwell base with lead-indium overlay
Coating: None
Part Number: VC 1044
Target Market: Extra clearance OEM replacement.

Mahle Motorsport (MMS) is a bespoke manufacturer based in Kilmarnock, Scotland. MMS manufactures bearings for Formula-1, NASCAR, Indy teams, and many other racing bearings throughout the world. MMS will make production runs as few as 80 shells, but no larger than 1600 shells. Even though MMS has machinery such as presses, stamps, and plating machines to make the bearings, the entire process is run by hand. The quality control coming from MMS should be one of the best in the world.

VP2 is a lead bronze material which is continuously cast onto steel strip. Casting and quenching conditions are controlled in order to produce a microstructure with vertically orientated bronze columns. This gives the bearing material its superior strength increasing its compressive load capacity. When plated with lead indium it has become the favoured material for racing engines.

Information on the Mahle Motorsport bearings is available at the Vandervell web site. https://vandervell.co.uk/aftermarket/our-technology/

Picture Description

Laser etched markings on Mahle Motorsport bearing shells

Standard (STD)

Dimensions

Standard (STD)

Bearing Dimensions	Metric Dimensions	Imperial (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	1.9925 mm	0.07845 inch
Bearing Thickness Variance (Top=Bottom)	1.9888 - 1.9952 mm	0.07830 - 0.07855 inch
Bearing Tolerance (Top=Bottom)	-0.0037 - 0.0026 mm	-0.00015 - +0.00010 inch

Bearing Clearance Specifications

Mahle Motorsport Custom Rod Bearings	Metric Dimensions	Imperial (Inch) Dimensions
Rod + Bearing Dimensions	TBD	TBD
Rod + Bearing Variance	TBD - TBD mm	TBD - TBD inch
Nominal Rod Bearing Clearance	TBD mm	TBD inch
Bearing Clearance Variance	TBD - TBD mm	TBD - TBD inch
Bearing Clearance Tolerance	TBD - TBD mm	TBD - TBD inch
Bearing Clearance per Journal inch		TBD inch/inch
Bearing Clearance per Journal Inch Variance		TBD - TBD inch/inch
Per-Shell Eccentricity	0.0165 mm	0.00065 inch
Per-Shell Eccentricity Variance	0.0127 - 0.0191 mm	0.00050 - 0.00075 inch
Per-Shell Eccentricity Tolerance	-0.0038 - 0.0025 mm	-0.00015 - 0.00010 inch
Assembled Bearing Eccentricity	TBD mm	TBD inch
Assembled Bearing Eccentricity Variance	TBD - TBD mm	TBD - TBD inch
Assembled Bearing Eccentricity Tolerance	-TBD - TBD mm	-TBD - TBD inch

Per-Shell Measurements

Shell Thickness (Inch)

Thicknesses	15°	20°	25°	30°	35°	45°	55°	65°	75°	85°	90°	95°	105°	115°	125°	135°	145°	150°	155°	160°	165°
1	0.07775	0.07780	0.07790	0.07795	0.07805	0.07815	0.07825	0.07835	0.07840	0.07840	0.07840	0.07840	0.07840	0.07840	0.07830	0.07825	0.07810	0.07805	0.07800	0.07790	0.07765
2	0.07775	0.07780	0.07790	0.07795	0.07800	0.07810	0.07825	0.07835	0.07840	0.07840	0.07840	0.07840	0.07840	0.07830	0.07825	0.07815	0.07815	0.07810	0.07800	0.07790	0.07770
3	0.07775	0.07785	0.07795	0.07800	0.07815	0.07820	0.07830	0.07840	0.07845	0.07850	0.07850	0.07845	0.07845	0.07840	0.07835	0.07830	0.07830	0.07815	0.07815	0.07800	0.07790
4	0.07780	0.07790	0.07800	0.07805	0.07810	0.07825	0.07830	0.07840	0.07845	0.07845	0.07845	0.07845	0.07845	0.07840	0.07835	0.07820	0.07820	0.07820	0.07810	0.07795	0.07790
5	0.07770	0.07780	0.07790	0.07795	0.07800	0.07820	0.07825	0.07835	0.07840	0.07845	0.07840	0.07840	0.07845	0.07840	0.07830	0.07835	0.07820	0.07815	0.07805	0.07800	0.07790
6	0.07795	0.07800	0.07805	0.07820	0.07825	0.07835	0.07845	0.07850	0.07855	0.07850	0.07850	0.07850	0.07850	0.07845	0.07835	0.07825	0.07825	0.07815	0.07810	0.07790	0.07780
7	0.07790	0.07800	0.07810	0.07815	0.07820	0.07840	0.07845	0.07850	0.07850	0.07855	0.07855	0.07855	0.07850	0.07845	0.07840	0.07825	0.07815	0.07810	0.07795	0.07790	0.07780
8	0.07785	0.07790	0.07805	0.07810	0.07815	0.07830	0.07840	0.07845	0.07855	0.07850	0.07855	0.07855	0.07850	0.07850	0.07845	0.07835	0.07825	0.07815	0.07810	0.07800	0.07790
9	0.07790	0.07785	0.07800	0.07800	0.07810	0.07820	0.07830	0.07840	0.07845	0.07845	0.07845	0.07845	0.07845	0.07835	0.07830	0.07825	0.07815	0.07810	0.07805	0.07795	0.07785
10	0.07775	0.07790	0.07790	0.07805	0.07810	0.07815	0.07825	0.07835	0.07845	0.07840	0.07840	0.07840	0.07840	0.07835	0.07830	0.07825	0.07810	0.07800	0.07795	0.07785	0.07775
11	0.07775	0.07785	0.07790	0.07800	0.07810	0.07820	0.07830	0.07835	0.07845	0.07845	0.07845	0.07845	0.07845	0.07835	0.07830	0.07825	0.07815	0.07810	0.07800	0.07785	0.07780
12	0.07775	0.07790	0.07790	0.07795	0.07805	0.07815	0.07830	0.07840	0.07850	0.07845	0.07845	0.07850	0.07850	0.07840	0.07840	0.07830	0.07820	0.07815	0.07805	0.07790	0.07785
13	0.07755	0.07765	0.07780	0.07785	0.07790	0.07805	0.07820	0.07820	0.07840	0.07850	0.07830	0.07830	0.07830	0.07825	0.07820	0.07815	0.07800	0.07795	0.07795	0.07785	0.07775
14	0.07770	0.07775	0.07795	0.07790	0.07800	0.07815	0.07825	0.07835	0.07845	0.07845	0.07845	0.07845	0.07845	0.07835	0.07835	0.07820	0.07820	0.07820	0.07800	0.07805	0.07785
15	0.07775	0.07785	0.07785	0.07795	0.07815	0.07810	0.07825	0.07835	0.07835	0.07840	0.07845	0.07845	0.07845	0.07845	0.07835	0.07835	0.07815	0.07810	0.07800	0.07795	0.07785
16	0.07775	0.07790	0.07795	0.07805	0.07805	0.07825	0.07830	0.07840	0.07845	0.07845	0.07845	0.07845	0.07845	0.07845	0.07835	0.07830	0.07820	0.07810	0.07805	0.07795	0.07785

Shell Thickness Variance

Shell Eccentricity Measurements (Inch)

Eccentricity	15°	20°	25°	30°	35°	45°	55°	65°	75°	85°	90°	95°	105°	115°	125°	135°	145°	150°	155°	160°	165°
1	0.00065	0.00060	0.00050	0.00045	0.00035	0.00025	0.00015	0.00005	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00010	0.00015	0.00030	0.00035	0.00040	0.00050	0.00075
2	0.00065	0.00060	0.00050	0.00045	0.00040	0.00030	0.00015	0.00005	0.00000	0.00000	0.00000	0.00000	0.00000	0.00010	0.00015	0.00025	0.00025	0.00030	0.00040	0.00050	0.00070
3	0.00075	0.00065	0.00055	0.00050	0.00035	0.00030	0.00020	0.00010	0.00005	0.00000	0.00000	0.00005	0.00005	0.00010	0.00015	0.00020	0.00020	0.00035	0.00035	0.00050	0.00060
4	0.00065	0.00055	0.00045	0.00040	0.00035	0.00020	0.00015	0.00005	0.00000	0.00000	0.00000	0.00000	0.00000	0.00005	0.00010	0.00025	0.00025	0.00025	0.00035	0.00050	0.00055
5	0.00070	0.00060	0.00050	0.00045	0.00040	0.00020	0.00015	0.00005	0.00000	-0.00005	0.00000	0.00000	-0.00005	0.00000	0.00010	0.00005	0.00020	0.00025	0.00035	0.00040	0.00050
6	0.00055	0.00050	0.00045	0.00030	0.00025	0.00015	0.00005	0.00000	-0.00005	0.00000	0.00000	0.00000	0.00000	0.00005	0.00015	0.00025	0.00025	0.00035	0.00040	0.00060	0.00070
7	0.00065	0.00055	0.00045	0.00040	0.00035	0.00015	0.00010	0.00005	0.00005	0.00000	0.00000	0.00000	0.00005	0.00010	0.00015	0.00030	0.00040	0.00045	0.00060	0.00065	0.00075
8	0.00070	0.00065	0.00050	0.00045	0.00040	0.00025	0.00015	0.00010	0.00000	0.00005	0.00000	0.00000	0.00005	0.00005	0.00010	0.00020	0.00030	0.00040	0.00045	0.00055	0.00065
9	0.00055	0.00060	0.00045	0.00045	0.00035	0.00025	0.00015	0.00005	0.00000	0.00000	0.00000	0.00000	0.00000	0.00010	0.00015	0.00020	0.00030	0.00035	0.00040	0.00050	0.00060
10	0.00065	0.00050	0.00050	0.00035	0.00030	0.00025	0.00015	0.00005	-0.00005	0.00000	0.00000	0.00000	0.00000	0.00005	0.00010	0.00015	0.00030	0.00040	0.00045	0.00055	0.00065
11	0.00070	0.00060	0.00055	0.00045	0.00035	0.00025	0.00015	0.00010	0.00000	0.00000	0.00000	0.00000	0.00000	0.00010	0.00015	0.00020	0.00030	0.00035	0.00045	0.00060	0.00065
12	0.00070	0.00055	0.00055	0.00050	0.00040	0.00030	0.00015	0.00005	-0.00005	0.00000	0.00000	-0.00005	-0.00005	0.00005	0.00005	0.00015	0.00025	0.00030	0.00040	0.00055	0.00060
13	0.00075	0.00065	0.00050	0.00045	0.00040	0.00025	0.00010	0.00010	-0.00010	-0.00020	0.00000	0.00000	0.00000	0.00005	0.00010	0.00015	0.00030	0.00035	0.00035	0.00045	0.00055
14	0.00075	0.00070	0.00050	0.00055	0.00045	0.00030	0.00020	0.00010	0.00000	0.00000	0.00000	0.00000	0.00000	0.00010	0.00010	0.00025	0.00025	0.00025	0.00045	0.00040	0.00060
15	0.00070	0.00060	0.00060	0.00050	0.00030	0.00035	0.00020	0.00010	0.00010	0.00005	0.00000	0.00000	0.00000	0.00000	0.00010	0.00010	0.00030	0.00035	0.00045	0.00050	0.00060
16	0.00070	0.00055	0.00050	0.00040	0.00040	0.00020	0.00015	0.00005	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00010	0.00015	0.00025	0.00035	0.00040	0.00050	0.00060

Shell Eccentricity Variance

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.
SPECIFICATIONS COMING SOON

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8

[PHOTO]
Bearing Eccentricity:

King Bearings

Introduction: May, 2019

Production and Composition

Manufacturer: King
Composition: Tri-metal silver/copper (upper shells), Tri-metal lead/copper (lower shells)
Coating: None
Part Number: CR 224SV
Target Market: Engine rebuild replacement only -- NOT OEM replacement.

Upper and lower shells of the King bearings are different. They are different compounds with different load characteristics. The upper shell are the King K796 SV compound: a silver/copper tri-metal design with more load capacity than the lower shell. The lower shell are the King K794 CP compound: a lead/copper tri-metal design.

The upper shells are stamped SV which indicates the King K796 compound. The lower shells are stamped CP which indicates the King K794 compound.

Information on these King compounds and chemical composition is available at the following web page. http://www.kingbearings.com/material-type/copper-based/

Installation Notes: King CR 224SV rod bearings are not intended for OEM replacements. Usage of these rod bearings requires the connecting rod big-end to be honed to size with new rod bolts. The OEM connecting rod big-end bore is specified between 56.0000 - 56.0130 mm. The King big-end specification is set to 56.055mm -- which is larger than factory specifications. Due to this change in specification, the rod big-end bore must be honed to match these specification before these rod bearings would be suitable for use. Consult your engine builder before attempting to use these bearings as an OEM replacement.

Picture Description

Standard (STD)

Dimensions

Bearing Dimensions	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, SV)	1.9914 mm	0.07840 inch
Nominal Bearing Thickness (Bottom, CP)	1.9952 mm	0.07855 inch
Bearing Thickness Variance (Top, SV)	1.9863 - 1.9914 mm	0.07820 - 0.07840 inch
Bearing Thickness Variance (Bottom, CP)	1.9914 - 2.0066 mm	0.07840 - 0.07900 inch
Bearing Tolerance (Top, SV)	-0.0051 - 0.0013 mm	-0.00020 - +0.00000 inch
Bearing Tolerance (Bottom, CV)	-0.0038 - 0.0114 mm	0.00014 - +0.00045 inch

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05235	2.05290	2.05260	2.05400	2.05280	2.05475	2.05265	2.05540
19.75	2.05105	2.05160	2.05130	2.05200	2.05120	2.05225	2.05110	2.05280
45.00	2.04940	2.04990	2.04960	2.05030	2.04940	2.05055	2.04965	2.05090
90.00	2.04795	2.04820	2.04820	2.04855	2.04855	2.04855	2.04855	2.04890
135.00	2.04905	2.04940	2.04975	2.04950	2.05000	2.04975	2.05055	2.04990
160.25	2.05155	2.05155	2.05210	2.05180	2.05320	2.05215	2.05240	2.05200
175.00	2.05365	2.05280	2.05460	2.05310	2.05530	2.05360	2.05515	2.05295
Clearance	0.00145	0.00170	0.00170	0.00205	0.00205	0.00205	0.00205	0.00240

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00440	0.00470	0.00440	0.00545	0.00425	0.00620	0.00410	0.00650
19.75	0.00310	0.00340	0.00310	0.00345	0.00265	0.00370	0.00255	0.00390
45.00	0.00145	0.00170	0.00140	0.00175	0.00085	0.00200	0.00110	0.00200
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00110	0.00120	0.00155	0.00095	0.00145	0.00120	0.00200	0.00100
160.25	0.00360	0.00335	0.00390	0.00325	0.00465	0.00360	0.00385	0.00310
175.00	0.00570	0.00460	0.00640	0.00455	0.00675	0.00505	0.00660	0.00405

Bearing Eccentricity: King Bearings vs. stock 702/703 rod bearings

ACL Bearings

Introduction: December, 2016

ACL Race Bearing Catalog: http://www.aclperformance.com.au/documents/56469_RaceSeriesInfo.pdf
BE Bearings Photo Blog: http://www.rcollins-home.org/photobucket/thumbnails.php?album=278

Production and Composition

Manufacturer: ACL
Composition: Tri-metal lead/copper
Coating: None
Part Number: 8B1580H (STD, +0.25 mm), 8B1580HX (+0.025 mm)
Target Market: OEM replacement market; Minimal increase in clearance over OEM rod bearings

ACL Bearings are a full custom rod bearing designed and manufactured by ACL. ACL manufactures the bearings to their own custom specifications.

The composition is a standard lead/copper bearing. The bearing does not contain a low-friction coating.

Set Numbering ACL RACE Series bearing sets are identified by the ‘H’ after the set number e.g. 8B663H-Std. Most ACL RACE Series bearings are also produced in a ‘HX’ version e.g. 8B663HX-Std. The ‘X’ signifies the set will give an extra .001” (.025mm) oil clearance on a standard size shaft when compared to the H-STD set. The wall size of these HX-STD bearings is .0005” (.013mm) thinner than the H-STD Bearings, in all other respects the HX set is identical to the H-STD set. There are selected con rod bearing sets that are manufactured with a dowel hole in the lower shell, to suit a dowel location in the con rod cap. These are designated with a ‘D’ in the set numbering e.g. 8B663HD-Std or 8B663HXD-Std etc.

Lead/Copper, Tri-Metal design Tri-Metal, lead/copper are considered the world's best bearings.  The steel backing is coated with copper, then topped with a soft lead.  The lead is embeddable, meaning small particles can embed themselves in the lead without causing any damage to the crankshaft.  Look in the best automotive engines, and you're likely to find a Tri-Metal bearing design.

Oil Clearances Oil clearances are most accurately measured using micrometres and bore gauges. Bearing wall thickness measurements are taken at 90 degrees to the parting line (i.e. at the crown of the bearing) using a micrometre with a ball anvil, for use on the curved ID of the bearing.

Vertical oil clearance is best measured by assembling the bearing in its housing, with bolts torqued to specification, then using a bore gauge measure the assembled ID of the bearings at 90 degrees to the parting faces. The mating crankshaft journal size is measured, and subtracting this measurement from the bearing ID bore size, gives the assembled oil clearance.

ACL RACE bearings can be assembled with .00075-.001” per 1” of journal diameter (0.020-0.025mm per 25mm of journal diameter) plus .0005” (0.013mm).

As an example for a 2.000” (50mm) journal diameter, 2.000 x .001= .002 + .0005 = .0025” (50/25 x 0.025= 0.050 + .013 = 0.063 mm) Bearings should not be polished with abrasive pads or paper, on the bearing surface, to change the oil clearance.

Picture Description

Questions about the appearance of the RACE Series bearings are quite common, as this series of tri-metal copper lead bearings have a very different appearance to regular aftermarket “ACL Duraglide” tri-metal bearings, which have a light silver /grey appearance.

The RACE Series performance bearings as manufactured have an appearance that is a dark tarnished colouration, which can vary from dark black/brown/blue colours. This colour comes from the electroplating which is the last manufacturing process. The electroplated overlay has copper as one part of its composition, which tarnishes to the dark colours described above. This tarnish colouration has negligible thickness, so once installed in the engine, the crankshaft journal contacting the bearing, will polish the bearing surface, removing the surface colour and leaving the bearings with a polished silver appearance.

Performance bearings do not start out with the silver grey appearance of regular aftermarket bearings, as there is no final silvery tin flash applied to these bearings. Not applying a silvery tin flash to these high performance bearings is a specific design feature. A silvery tin flash for appearance and long term corrosion protection, as applied to the regular aftermarket bearings, can under high loading and heat, move, with the plate migrating and causing high spots on the back of the shells, and distorting the bearing. For this reason the ACL RACE Series performance bearings do not have a cosmetic silvery tin flash applied, so there is no risk of any overlay plate movement on the backs of the shells, giving better bearing to housing contact and better bearing performance and function.

Standard (STD)

+0.250 MM, +0.010 INCH

Dimensions

ACL-H-STD

Bearing Dimensions (ACL Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	1.9900 mm	0.07870 inch
Bearing Thickness Variance (Top=Bottom)	1.9939 - 2.0003 mm	0.07850 - 0.07875 inch
Bearing Tolerance (Top=Bottom)	-0.0051 - 0.0013 mm	-0.00020 - +0.00005 inch

ACL-HX-STD (+0.025 MM, +0.001 INCH)

Bearing Dimensions (ACL Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	1.9850 mm	0.07815 inch
Bearing Thickness Variance (Top=Bottom)	1.9825 - 1.9850 mm	0.07805 - 0.07815 inch
Bearing Tolerance (Top=Bottom)	-0.0025 - 0.0000 mm	-0.00010 - +0.00000 inch

ACL-H+0.25 (+0.250 MM, +0.010 INCH)

Bearing Dimensions (ACL Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	2.1209 mm	0.08350 inch
Bearing Thickness Variance (Top=Bottom)	2.1184 - 2.1247 mm	0.08340 - 0.08365 inch
Bearing Tolerance (Top=Bottom)	-0.0013 - 0.0038 mm	-0.00005 - +0.00015 inch

Bearing Clearance Specifications

ACL-H-STD Theoretical Clearance

The theoretical rod bearing clearance is calculated using the formula at the top of the page, while using the ACL manufacturer's specifications.

Abbreviation	Metric Dimensions	SAE (Inch) Dimensions
JDmin	51.975	2.0463
JDmax	51.991	2.0469
BEBmin	56.000	2.2047
BEBmax	56.013	2.2052
UPRmin / LOWmin	1.990	0.0783
UPRmax / LOWmax	1.998	0.0787
CTmin	0.000	0.0000
CTmax	0.000	0.0000
CLRmin	= BEmin - JDmax - LWRmax - UPRmax - (2*CTmax) = 56.000 - 51.991 - 1.998 - 1.998 - (2 * 0.000) = 0.013 mm	= BEmin - JDmax - LWRmax - UPRmax - (2*CTmax) = 2.2047 - 2.0469 - 0.0787 - 0.0787 - (2 * 0.0000) = 0.00051 inch
CLRmax	= BEmax - JDmin - LWRmin - UPRmin - (2*CTmin) = 56.013 - 51.975 - 1.990 - 1.990 - (2 * 0.000) = 0.058 mm	= BEmax - JDmin - LWRmin - UPRmin - (2*CTmin) = 2.2052 - 2.0463 - 0.0783 - 0.0783 - (2 * 0.0000) = 0.0023 inch
CLRnom	= (CLRmin + CLRmax) / 2 = (0.013 + 0.058) / 2 = 0.071 / 2 = 0.0355 mm	= (CLRmin + CLRmax) / 2 = (0.00051 + 0.00230) / 2 = 0.00270 / 2 = 0.00135 inch
CLRji	Clearance per journal-inch diameter	= CLRnom / JDnom = 0.00135 / ((2.0463 + 2.0469) / 2) = 0.00135 / (4.0932 / 2) = 0.00135 / 2.0466 = 0.00066 clearance per journal-inch

ACL-H-STD

ACL Bearings (ACL) Custom Rod Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0294 mm	2.04840 inch
Rod + Bearing Variance	52.0294 - 52.0383 mm	2.04840 - 2.04875 inch
Nominal Rod Bearing Clearance	0.0483 mm	0.00190 inch
Bearing Clearance Variance	0.0406 - 0.0597 mm	0.00160 - 0.00235 inch
Bearing Clearance Tolerance	-0.0076 - +0.0114 mm	-0.00030 - +0.00035 inch
Bearing Clearance per Journal inch		0.00093 inch/inch
Bearing Clearance per Journal Inch Variance		0.00078 - 0.00115 inch/inch
Bearing Eccentricity	0.0533 mm	0.00210 inch
Bearing Eccentricity Variance	0.0343 - 0.0622 mm	0.00135 - 0.00245 inch
Bearing Eccentricity Tolerance	-0.0191 - +0.0089 mm	-0.00075 - +0.00035 inch

ACL-HX-STD Theoretical Clearance

The theoretical rod bearing clearance is calculated using the formula at the top of the page, while using the ACL manufacturer's specifications.

Abbreviation	Metric Dimensions	SAE (Inch) Dimensions
JDmin	51.975	2.0463
JDmax	51.991	2.0469
BEBmin	56.000	2.2047
BEBmax	56.013	2.2052
UPRmin / LOWmin	1.977	0.0778
UPRmax / LOWmax	1.985	0.0781
CTmin	0.000	0.0000
CTmax	0.000	0.0000
CLRmin	= BEmin - JDmax - LWRmax - UPRmax - (2*CTmax) = 56.000 - 51.991 - 1.985 - 1.985 - (2 * 0.000) = 0.039 mm	= BEmin - JDmax - LWRmax - UPRmax - (2*CTmax) = 2.2047 - 2.0469 - 0.0781 - 0.0781 - (2 * 0.0000) = 0.00153 inch
CLRmax	= BEmax - JDmin - LWRmin - UPRmin - (2*CTmin) = 56.013 - 51.975 - 1.977 - 1.977 - (2 * 0.000) = 0.084 mm	= BEmax - JDmin - LWRmin - UPRmin - (2*CTmin) = 2.2052 - 2.0463 - 0.0778 - 0.0778 - (2 * 0.0000) = 0.00330 inch
CLRnom	= (CLRmin + CLRmax) / 2 = (0.039 + 0.084) / 2 = 0.123 / 2 = 0.0615 mm	= (CLRmin + CLRmax) / 2 = (0.00153 + 0.00330) / 2 = 0.00270 / 2 = 0.00242 inch
CLRji	Clearance per journal-inch diameter	= CLRnom / JDnom = 0.00242 / ((2.0463 + 2.0469) / 2) = 0.00242 / (4.0932 / 2) = 0.00242 / 2.0466 = 0.00118 clearance per journal-inch

ACL-HX-STD

ACL Bearings (ACL) Custom Rod Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0548 mm	2.04940 inch
Rod + Bearing Variance	52.0497 - 52.0624 mm	2.04920 - 2.04970 inch
Nominal Rod Bearing Clearance	0.0737 mm	0.00290 inch
Bearing Clearance Variance	0.0610 - 0.0838 mm	0.00240 - 0.00330 inch
Bearing Clearance Tolerance	-0.0127 - +0.0102 mm	-0.00050 - +0.00040 inch
Bearing Clearance per Journal inch		0.00142 inch/inch
Bearing Clearance per Journal Inch Variance		0.00117 - 0.00161 inch/inch
Bearing Eccentricity	0.0864 mm	0.00340 inch
Bearing Eccentricity Variance	0.0635 - 0.1118 mm	0.00250 - 0.00440 inch
Bearing Eccentricity Tolerance	-0.0229 - +0.0254 mm	-0.00090 - +0.00100 inch

Shell Thickness Measurements

ACL-H-STD

	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
Upper	0.07870	0.07865	0.07870	0.07870	0.07865	0.07860	0.07865	0.07865
Lower	0.07860	0.07860	0.07875	0.07870	0.07870	0.07850	0.07860	0.07850

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

ACL-HX-STD

	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
Upper	0.07805	0.07805	0.07810	0.07815	0.07815	0.07815	0.07815	0.07810
Lower	0.07805	0.07810	0.07810	0.07815	0.07815	0.07815	0.07810	0.07815

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Clearance Measurements

ACL-H-STD

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05220	2.05225	2.05320	2.05280	2.05105	2.05245	2.05115	2.05315
19.75	2.04985	2.05060	2.05050	2.05050	2.05015	2.05050	2.05020	2.05100
45.00	2.04885	2.04900	2.04900	2.04900	2.04920	2.04920	2.04920	2.04940
90.00	2.04850	2.04850	2.04840	2.04840	2.04875	2.04840	2.04865	2.04855
135.00	2.04920	2.04840	2.04900	2.04940	2.04940	2.04900	2.04930	2.04925
160.25	2.05060	2.05040	2.05020	2.05060	2.05060	2.05060	2.05020	2.05055
175.00	2.05150	2.05205	2.05100	2.05200	2.05280	2.05210	2.05240	2.05120
Clearance	0.00200	0.00200	0.00190	0.00190	0.00225	0.00190	0.00215	0.00205

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

ACL-HX-STD

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05430	2.05450	2.05350	2.05420	2.05500	2.05500	2.05460	2.05515
19.75	2.05240	2.05260	2.05200	2.05245	2.05300	2.05300	2.05280	2.05300
45.00	2.05070	2.05080	2.05040	2.05070	2.05115	2.05115	2.05100	2.05105
90.00	2.04940	2.04950	2.04950	2.04960	2.04960	2.04940	2.04940	2.04920
135.00	2.05055	2.05060	2.05100	2.05080	2.05070	2.05085	2.05080	2.05080
160.25	2.05230	2.05300	2.05330	2.05310	2.05250	2.05300	2.05365	2.05360
175.00	2.05460	2.05480	2.05520	2.05500	2.05500	2.05510	2.05560	2.05500
Clearance	0.00290	0.00300	0.00300	0.00310	0.00310	0.00290	0.00290	0.00270

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

ACL-H-STD

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00370	0.00375	0.00480	0.00440	0.00230	0.00405	0.00250	0.00460
19.75	0.00135	0.00210	0.00210	0.00210	0.00140	0.00210	0.00155	0.00245
45.00	0.00035	0.00050	0.00060	0.00060	0.00045	0.00080	0.00055	0.00085
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00070	-0.00010	0.00060	0.00100	0.00065	0.00060	0.00065	0.00070
160.25	0.00210	0.00190	0.00180	0.00220	0.00185	0.00220	0.00155	0.00200
175.00	0.00300	0.00355	0.00260	0.00360	0.00405	0.00370	0.00375	0.00265

ACL-HX-STD

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00490	0.00500	0.00400	0.00460	0.00540	0.00560	0.00520	0.00595
19.75	0.00300	0.00310	0.00250	0.00285	0.00340	0.00360	0.00340	0.00380
45.00	0.00130	0.00130	0.00090	0.00110	0.00155	0.00175	0.00160	0.00185
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00115	0.00110	0.00150	0.00120	0.00110	0.00145	0.00140	0.00160
160.25	0.00290	0.00350	0.00380	0.00350	0.00290	0.00360	0.00425	0.00440
175.00	0.00520	0.00530	0.00570	0.00540	0.00540	0.00570	0.00620	0.00580

Eccentricity Graph

Bearing Eccentricity: ACL Bearings vs. stock 702/703 rod bearings

VAC Clevite Bearings

Introduction: March, 2015

Production and Composition

Manufacturer: Clevite
Composition: Tri-metal lead/copper
Coating: Calico CT-1
Part Number: SP1512HX
Target Market: OEM replacement market; Standard (factory) clearance, not extra.
History of VAC Bearings: In VAC's own words.

Custom made by Clevite for VAC Motorsports.

The composition is a standard babbit lead/copper bearing with additional Calico non-friction coating. They are soft faced, and easy on the crankshaft, and compatible with stop-start vehicles.

Picture Description

Dimensions

Bearing Dimensions (VAC Clevite Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top=Bottom)	1.9901 mm	0.07835 inch
Bearing Thickness Variance (Top=Bottom)	1.9876 - 1.9914 mm	0.07825 - 0.07840 inch
Bearing Tolerance (Top=Bottom)	-0.0025 - 0.0013 mm	-0.00010 - +0.00005 inch

Bearing Clearance Specifications

VAC (Clevite) Custom Rod Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0344 mm	2.04860 inch
Rod + Bearing Variance	52.0294 - 52.0344 mm	2.04840 - 2.04860 inch
Nominal Rod Bearing Clearance	0.0533 mm	0.00210 inch
Bearing Clearance Variance	0.0406 - 0.0559 mm	0.00160 - 0.00220 inch
Bearing Clearance Tolerance	-0.0127 - +0.0025 mm	-0.00050 - +0.00010 inch
Bearing Clearance per Journal inch		0.00103 inch/inch
Bearing Clearance per Journal Inch Variance		0.00078 - 0.00108 inch/inch
Bearing Eccentricity	0.0203 mm	0.00080 inch
Bearing Eccentricity Variance	0.0114 - 0.0254 mm	0.00045 - 0.00100 inch
Bearing Eccentricity Tolerance	-0.0089 - +0.0051 mm	-0.00035 - +0.00020 inch

Clearance Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	2.05160	2.05115	2.05080	2.05100	2.05100	2.05080	2.05120	2.05100
19.75	2.04920	2.04925	2.04925	2.04950	2.04940	2.04940	2.04945	2.04925
45.00	2.04860	2.04860	2.04860	2.04875	2.04875	2.04880	2.04880	2.04860
90.00	2.04860	2.04840	2.04840	2.04860	2.04860	2.04840	2.04860	2.04860
135.00	2.04900	2.04880	2.04865	2.04865	2.04865	2.04875	2.04885	2.04890
160.25	2.04905	2.04940	2.04920	2.04955	2.04920	2.04930	2.04940	2.04955
175.00	2.05060	2.05000	2.05100	2.05100	2.05060	2.05090	2.05100	2.05090
Clearance	0.00210	0.00190	0.00190	0.00210	0.00210	0.00190	0.00210	0.00210

Note: Clearance measurements are based on nominal rod journal diameter of 2.0465 inch.

Eccentricity Measurements

Angle	Rod-1	Rod-2	Rod-3	Rod-4	Rod-5	Rod-6	Rod-7	Rod-8
5.00	0.00300	0.00275	0.00240	0.00240	0.00240	0.00240	0.00260	0.00240
19.75	0.00060	0.00085	0.00085	0.00090	0.00080	0.00100	0.00085	0.00065
45.00	0.00000	0.00020	0.00020	0.00015	0.00015	0.00040	0.00020	0.00000
90.00	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
135.00	0.00040	0.00040	0.00025	0.00005	0.00005	0.00035	0.00025	0.00030
160.25	0.00045	0.00100	0.00080	0.00095	0.00060	0.00090	0.00080	0.00095
175.00	0.00200	0.00160	0.00260	0.00240	0.00200	0.00250	0.00240	0.00230

Bearing Eccentricity: VAC-Clevite vs. stock 088/089 vs. stock 702/703 rod bearings

WPC Treated Bearings

Production and Composition

WPC treated bearings start life as standard 072/703 bearings. These bearings are sold through Auto Talent and EAS. An end-user may also send bearings to WPC for treatment. Unlike Calico CT-1 coating, the WPC treated bearings slightly remove material to create a low-friction surface. Manufacturer: WPC

Dimensions

Bearing (WPC Treated Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue)	1.9939 mm	0.07850 inch
Nominal Bearing Thickness (Bottom, Red)	1.9901 mm	0.07835 inch
Bearing Thickness Variance (Top, Blue)	1.9939 - 1.9952 mm	0.07850 - 0.07855 inch
Bearing Thickness Variance (Bottom, Red)	1.9901 - 1.9914 mm	0.07835 - 0.07840 inch
Bearing Tolerance (Top, Blue)	0.0000 - 0.0013 mm	0.00000 - +0.00005 inch
Bearing Tolerance (Bottom, Red)	0.0000 - 0.0013 mm	0.00000 - +0.00005 inch

Bearing Clearance Specifications

WPC Treated Rod Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0281 mm	2.04835 inch
Rod + Bearing Variance	52.0268 - 52.0332 mm	2.04830 - 2.04855 inch
Nominal Rod Bearing Clearance	0.0470 mm	0.00185 inch
Bearing Clearance Variance	0.0381 - 0.0546 mm	0.00150 - 0.00215 inch
Bearing Clearance Tolerance	-0.0089 - +0.0076 mm	-0.00035 - +0.00030 inch
Bearing Clearance per Journal inch		0.00090 inch/inch
Bearing Clearance per Journal Inch Variance		0.00073 - 0.00105 inch/inch

Calico Coated 702/703 Bearings

Production and Composition

Calico coated bearings start life as standard 702/703 bearings. These bearings are sold through VAC, ESS, and Harrop. An end-user may also send bearings to Calico for coating. Calico adds their CT-1 coating to the surface of the bearing. The coating adds a slight thickness, thereby decreasing bearing clearance. The thickness to each shell is estimated by Calico between 0.0002 - 0.0004 inch.
Manufacturer: Calico Coatings
Manufacturing Defects: There's two primary manufacturing defects associated with Calico coated bearings.

1. Calico coating is also placed on the parting lines. The material on the parting lines will affect the "bearing crush" and may wear unevenly or in a different manner than a standard OEM bearing.
2. BMW bearings are sold in upper (blue) and lower (red) bearing shells. When the Calico coating is applied, this color distinction is lost. The upper (blue) bearings are slightly thicker than the lower (red) bearings. However, Calico habitually mixes these shells up and returns them to the customer mislabeled: uppers are now lowers, and visa-versa.

Dimensions

Bearing Dimensions (Calico Coated 702/703 Bearings)	Metric Dimensions	SAE (Inch) Dimensions
Nominal Bearing Thickness (Top, Blue)	2.0003 mm	0.07875 inch
Nominal Bearing Thickness (Bottom, Red)	1.9939 mm	0.07850 inch
Bearing Thickness Variance (Top, Blue)	1.9990 - 2.0028 mm	0.07870 - 0.07885 inch
Bearing Thickness Variance (Bottom, Red)	1.9939 - 1.9964 mm	0.07850 - 0.07860 inch
Bearing Tolerance (Top, Blue)	-0.0013 - 0.0025 mm	-0.00005 - +0.00010 inch
Bearing Tolerance (Bottom, Red)	-0.0000 - 0.0025 mm	-0.00000 - +0.00010 inch

Bearing Clearance Specifications

Calico Coated 702/703 Bearings	Metric Dimensions	SAE (Inch) Dimensions
Rod + Bearing Dimensions	52.0179 mm	2.04795 inch
Rod + Bearing Variance	52.0154 - 52.0192 mm	2.04785 - 2.04780 inch
Nominal Rod Bearing Clearance	0.0368 mm	0.00145 inch
Bearing Clearance Variance	0.0267 - 0.0406 mm	0.00105 - 0.00160 inch
Bearing Clearance Tolerance	-0.0102 - +0.0038 mm	-0.00040 - +0.00015 inch
Bearing Clearance per Journal inch		0.00071 inch/inch
Bearing Clearance per Journal Inch Variance		0.00051 - 0.00078 inch/inch

Rod Bearing Part Numbers, History

BMW Part Number	Description	Location	Color	Standard Size Bearings	Application	Prod. Start	Prod. End	Superceded By
11 24 7 835 662	Connecting Rod Bearing	Bottom	Red	52.00 mm (+0.00 mm)	S85B50	Apr-04	Apr-04	11 24 7 836 288
11 24 7 835 663	Connecting Rod Bearing	Top	Blue	52.00 mm (+0.00 mm)	S85B50	Apr-04	Apr-04	11 24 7 836 289
11 24 7 836 288	Connecting Rod Bearing	Bottom	Red	52.00 mm (+0.00 mm)	S85B50	Sep-04	Apr-07	11 24 7 838 088
11 24 7 836 289	Connecting Rod Bearing	Top	Blue	52.00 mm (+0.00 mm)	S85B50	Sep-04	May-07	11 24 7 838 089
11 24 7 838 088	Connecting Rod Bearing	Bottom	Red	52.00 mm (+0.00 mm)	S85B50, S65B40, S65B44	Feb-06	Oct-11	11 24 7 841 702
11 24 7 838 089	Connecting Rod Bearing	Top	Blue	52.00 mm (+0.00 mm)	S85B50, S65B40, S65B44	Feb-06	Mar-11	11 24 7 841 703
11 24 7 841 702	Connecting Rod Bearing	Bottom	Red	52.00 mm (+0.00 mm)	S85B50, S65B40, S65B44	Jun-10	Present
11 24 7 841 703	Connecting Rod Bearing	Top	Blue	52.00 mm (+0.00 mm)	S85B50, S65B40, S65B44	Jun-10	Present

BMW Part Number	Description	Location	Color	Oversize Bearings	Application	Prod. Start	Prod. End	Superceded By
11 24 7 835 974	Connecting Rod Bearing	Bottom	Red	51.75 mm (+0.25 mm)	S85B50	Apr-04	Apr-04	11 24 7 836 290
11 24 7 835 975	Connecting Rod Bearing	Top	Blue	51.75 mm (+0.25 mm)	S85B50	Apr-04	Apr-04	11 24 7 836 291
11 24 7 836 290	Connecting Rod Bearing	Bottom	Red	51.75 mm (+0.25 mm)	S85B50	Aug-05	Dec-07	11 24 7 838 090
11 24 7 836 291	Connecting Rod Bearing	Top	Blue	51.75 mm (+0.25 mm)	S85B50	Aug-05	Dec-07	11 24 7 838 091
11 24 7 838 090	Connecting Rod Bearing	Bottom	Red	51.75 mm (+0.25 mm)	S85B50, S65B40, S65B44	Sep-05	Present
11 24 7 838 091	Connecting Rod Bearing	Top	Blue	51.75 mm (+0.25 mm)	S85B50, S65B40, S65B44	Sep-05	Present

Supporting Measurements

Connecting Rod Journals

	Cyl-5	Cyl-1	Cyl-6	Cyl-2	Cyl-7	Cyl-3	Cyl-8	Cyl-4
Engine-1	2.04650	2.04655	2.04655	2.04650	2.04660	2.04655	2.04650	2.04660
Engine-2	2.04650	2.04655	2.04655	2.04650	2.04660	2.04660	2.04650	2.04650
Engine-3	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650
Engine-4	2.04660	2.04670	2.04650	2.04660	2.04640	2.04640	2.04650	2.04650
Engine-5	2.04650	2.04650	2.04650	2.04650	2.04640	2.04640	2.04640	2.04640
Engine-6	2.04670	2.04680	2.04670	2.04670	2.04670	2.04670	2.04670	2.04670
Engine-7	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650
Engine-8	2.04650	2.04650	2.04650	2.04650	2.04640	2.04640	2.04640	2.04640
Engine-9	2.04650	2.04650	2.04650	2.04650	2.04640	2.04640	2.04640	2.04640
Engine-10	2.04650	2.04650	2.04650	2.04650	2.04640	2.04640	2.04660	2.04660
Engine-11	2.04680	2.04680	2.04650	2.04650	2.04640	2.04650	2.04660	2.04670
Engine-12	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650	2.04650

Official Measurements

	Min	Max	Official	Min Dev.	Max Dev.
Journal	2.04640	2.04680	2.04650	-0.00010	0.00030
Bearing	2.04815	2.04840	2.04820	-0.00005	0.00020
Clearance	0.00135	0.00200	0.00170	-0.00035	0.00030

Measurement Deviations

Journal Size	Deviations
2.04630	0
2.04640	17
2.04650	53
2.04660	14
2.04670	9
2.04680	3
2.04690	0
2.04700	0