ACL Race main bearings are trimetal engine bearings designed to withstand higher RPM conditions. Their combination of design, metallurgy and engineering is developed for the demands of high-performance engines.
The reduced thickness of the high-strength overlay improves fatigue properties, while increased eccentricity helps compensate for bore distortion and assists in forming hydrodynamic oil films.
- High-strength overlay plate with reduced thickness
- Increased crush for improved bearing retention in the housing
- No flash plating on the back for improved heat transfer
- 3/4 grooved main bearings to optimize load-carrying surface area and oil flow
- Tight, consistent wall tolerances to help maintain consistent clearances
- Enlarged ID chamfers on bearing edges for large fillet radii on performance crankshafts
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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