ACL Race main bearings are high-performance trimetal bearings designed for higher RPM conditions and demanding engine operation. Their construction combines high strength, tight wall-thickness tolerances and increased eccentricity to assist in forming a hydrodynamic oil film.
The set includes 3/4-grooved main bearings, optimizing the bearing load-carrying surface and oil flow to the conrod bearings. Enlarged ID chamfers on the bearing edges accommodate larger fillet radii on performance crankshafts.
- Trimetal construction with a high-strength overlay plate of reduced thickness
- Increased crush for improved bearing retention in the housing
- Flash plating eliminated from the back for improved heat transfer and grip
- Increased eccentricity to compensate for bore distortion at high RPM
- 3/4-grooved main bearings for optimized oil flow
- Tight, consistent wall-thickness tolerances
Suitable for: BMW 1 I (E81/E82/E87/E88) / II (F20/F21), BMW 2 I (F22/F23/F45/F46/F87), BMW 3 V (E90/E91/E92/E93) / VI (F30/F31/F34/F80), BMW 4 I (F32/F33/F36/F82/F83), BMW 5-Gran-Turismo I (F07), BMW 5 VI (F10/F11), BMW 6 III (F06/F12/F13), BMW 7 V (F01/F02/F03/F04), BMW M2 I (F22/F23/F45/F46/F87), BMW M3 VI (F30/F31/F34/F80), BMW X3 II (F25), BMW X4 I (F26), BMW X5 II (E70) / III (F15/F85), BMW X6 I (E71/E72) / II (F16/F86), BMW Z4 II (E89).
Engines: N55, N54, S55, N52 (N55B30A, N54B30A, S55B30A, N52B25, S55B30). 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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