ACL Race main bearings for BMW M20

The ACL Race Series main bearing set is designed to support the crankshaft and maintain the correct operating clearance in the BMW M20 engine.

It is available in standard size and selected undersizes to suit an overhauled engine and machined crankshaft.

Suitable for: BMW 3 II (E30), BMW 5 I (E28) / II (E34), BMW Z1 I (E30/Z), BMW Z3 I (E36).

Engines: M20 (M20B25, M20B27, M20B20, M20B23). Please check your vehicle’s engine code (registration document or VIN) before ordering; if in doubt, contact us and we will check for you.

Sizes

STD is the standard size for an unground crankshaft. Undersizes (−0.25 mm, −0.50 mm …) are for a reground crank, and “+0.025 mm clearance” (X) is for highly stressed engines. Your machine shop chooses the size after measuring.