Engine Specs - S65 Rod Bearings
Contents
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 |
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.
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) (1) | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Rod + Bearing Dimensions | 52.0179 mm | 2.04795 inch |
| Rod + Bearing Variance (1) | 52.0154 - 52.0192 mm | 2.04785 - 2.04800 inch |
| Nominal Rod Bearing Clearance | 0.0368 mm | 0.00145 inch |
| Bearing Clearance Variance (1) | 0.0343 - 0.0381 mm | 0.00135 - 0.00150 inch |
| Bearing Clearance Tolerance | -0.0025 - +0.0013 mm | -0.00010 - +0.00005 inch |
| Bearing Clearance per Journal inch | 0.00071 inch/inch | |
| Bearing Clearance per Journal Inch Variance (1) | 0.00066 - 0.00073 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 |
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 composition. BMW increased the clearance slightly over the 088/089 bearings and increased the eccentricity as well. But this improvement in clearance and eccentricity came at a price. The 702/703 bearings are substantially harder than the 088/089 bearings they replaced. As a consequence, then a bearing is spun, it tends to cause more damage to the crankshaft in the process.
Manufacturer: King (believed to be King, but this is unconfirmed).
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 | 52.0243 mm | 2.04820 inch |
| Rod + Bearing Variance | 52.0230 - 52.0294 mm | 2.04815 - 2.04840 inch |
| Nominal Rod Bearing Clearance | 0.0432 mm | 0.00170 inch |
| Bearing Clearance Variance | 0.0419 - 0.0483 mm | 0.00165 - 0.00190 inch |
| Bearing Clearance Tolerance | -0.0089 - +0.0076 mm | -0.00035 - +0.00030 inch |
| Bearing Clearance per Journal inch | 0.00083 inch/inch | |
| Bearing Clearance per Journal Inch Variance | 0.00081 - 0.00093 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 |
Calico Coated Bearings
Production and Composition
Calico coated bearings start life as standard 072/703 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.
- 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.
- 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
Will post when available.
Bearing Clearance Specifications
| VAC (Calico) Coated Rod Bearings (2) | Metric Dimensions | SAE (Inch) Dimensions |
|---|---|---|
| Rod + Bearing Dimensions | 52.0141 mm | 2.04780 inch |
| Rod + Bearing Variance | 52.0090 - 52.0141 mm | 2.04760 - 2.04780 inch |
| Nominal Rod Bearing Clearance | 0.0330 mm | 0.00130 inch |
| Bearing Clearance Variance | 0.0279 - 0.0330 mm | 0.00110 - 0.00130 inch |
| Bearing Clearance Tolerance | -0.0127 - +0.0025 mm | -0.00050 - +0.00010 inch |
| Bearing Clearance per Journal inch | 0.00063 inch/inch | |
| Bearing Clearance per Journal Inch Variance | 0.00054 - 0.00063 inch/inch |
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
Will post when available.
Bearing Clearance Specifications
| WPC Treated Rod Bearings (3) | 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 | 0.0457 - 0.0521 mm | 0.00180 - 0.00205 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 | 0.00088 - 0.00100 inch/inch |
