ACL Race Series main bearings use a trimetal construction for engines operating at higher RPM. The design combines a high-strength overlay plate with tight, consistent wall tolerances for consistent clearances.
This set provides 0.025 mm extra clearance, increased eccentricity to compensate for bore distortion at high RPM, and 3/4 grooved main bearings to optimize load-carrying surface area and oil flow.
- High-strength overlay plate with reduced thickness
- Increased crush for improved bearing retention in the housing
- Flash plating removed from the back for improved heat transfer and grip
- Tight, consistent wall tolerances
- Enlarged ID chamfers for large fillet radii on performance crankshafts
- 0.025 mm extra clearance
Suitable for: Saab 9-2X I, Subaru Baja I (B12), Subaru Exiga I (YA5), Subaru Forester I (SF) / II (SG) / III (SH), Subaru Impreza I (GC/GF) / II (GD/GG) / III (GE/GV) / III (GH/GR) / III (STI/GRB), Subaru Legacy I (BC) / I (BF) / II (BD/BG) / III (BE/BH) / IV (BL/BP) / V (BM/BR), Subaru Outback II (ESTATE/BH) / III (BL/BP) / IV (BR), Subaru Wrx I (GJ/V1) / I (STI/VAB/VAF/VAG).
Engines: EJ20, EJ25, EJ22, EJ18 (EJ253, EJ255, EJ205, EJ20T, EJ25D, EJ251, EJ257, EJ20G, EJ22E, EJ20E, EJ20K, EJ207, EJ18E, EJ22G, EJ22T, EJ20D, EJ206, EJ208, EJ20Y, EJ252). 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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