ACL Race Series connecting rod bearings for BMW M3 E90/E92/E93 (V8 S65)
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ACL Race Series connecting rod bearing set for BMW M3 E90/E92/E93 (V8 S65), part number 8B1580H. This is ACL's competition line, the same used in drift, circuit, and drag racing engines.
Inside, they feature three layers on a high-strength steel backing: a copper-lead-tin lining, a thin nickel barrier, and a lead-tin-copper sliding layer, which is what interfaces with the crankshaft. In connecting rod bearings, the surface layer is thinner to better withstand fatigue.
Compared to a standard bearing, the Race line has more interference in the housing, which improves retention and heat transfer, as well as greater eccentricity to favor the oil film when the engine is revving high.
In standard size, ACL specifies this for a connecting rod journal of 51.975 to 51.991 mm, with a bearing width of 15.9 mm. For that diameter, they recommend an oil clearance of about 0.055 to 0.065 mm, measured with a micrometer and bore gauge. If the crankshaft has been reground, the measurement changes.
They do not have the final silver tin plating of standard bearings, so their dark, brownish-black-bluish color is the factory finish and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, combine them with the HX version, which provides 0.025 mm more clearance.
Not sure if your crankshaft is standard size? Write to us with your engine code and we will help you choose.