ACL Race Series connecting rod bearings for Mini Cooper S (W11B16 Compressor)
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ACL Race Series connecting rod bearings for Mini Cooper S (W11B16 Compressor) (part number 4B2902H), designed for engines that will operate under much higher loads and higher RPMs than stock.
Internally, they feature three layers on a high-strength steel base: a copper-lead-tin lining, a thin nickel barrier, and a lead, tin, and copper sliding layer, which is the one that works against the crankshaft. In the connecting rod bearings, the surface layer is thinner to better withstand fatigue.
The Race Series have more crush and a slightly more eccentric shape than standard bearings, two details designed to ensure the bearing does not move and remains well-lubricated when the block and connecting rod deform under load.
In standard size, ACL specifies them for a connecting rod journal of 45.992 to 46.008 mm, with a bearing width of 17.25 mm. For that diameter, it recommends an oil clearance of about 0.050 to 0.059 mm, measured with a micrometer and bore gauge. If the crankshaft is reground, the measurement changes.
They do not have the silver tin final coating of standard bearings, so their dark color—ranging from brown and black to bluish—is the factory finish and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, they should be combined with the HX version, which provides 0.025 mm of additional clearance.
Before ordering, confirm the measurement of your crankshaft (standard or reground); if you have any questions, write to us with the engine code.