ACL Race main bearings are trimetal engine bearings designed for high-performance engines operating at higher RPM. Their construction combines a high-strength overlay plate, precise wall tolerances and improved bearing retention in the housing.
3/4 grooved main bearings optimize the bearing load-carrying surface area and oil flow to the conrod bearings. Increased eccentricity helps compensate for bore distortion at high RPM and assists in forming a hydrodynamic oil film.
- Trimetal construction with a high-strength overlay plate and reduced thickness
- Increased crush for improved bearing retention in the housing
- Flash plating eliminated on the back for improved heat transfer and housing grip
- 3/4 grooved main bearings for optimized oil flow
- Tight, consistent wall tolerances
Suitable for: BMW 3 II (E30) / III (E36) / IV (E46), BMW 5 I (E28) / II (E34) / IV (E39) / V (E60/E61), BMW 7 III (E38) / IV (E65/E66/E67), BMW M3 III (E36), BMW X3 I (E83), BMW X5 I (E53), BMW Z1 I (E30/Z), BMW Z3 I (E36), BMW Z4 I (E85/E86).
Engines: M54, M52, M20, M50, S50, M57, S54, S52 (M20B27, M20B25, M52B20, M50B25, M52B25, M52B28, S50B30, S50B32, M50B20, M54B22, M54B25, M57D30, M54B30, S54B32, M20B20, M20B23, M50B27, S52B32). 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.
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