ACL Race Series main bearings are tri-metal engine bearings developed through a combination of design, metallurgy and engineering for higher-RPM operation.
The design uses increased eccentricity to compensate for bore distortion at high RPM and assist in forming hydrodynamic oil films. The set includes 0.025 mm extra clearance.
- high-strength overlay plate with reduced thickness for improved fatigue properties
- increased crush for improved bearing retention in the housing
- elimination of flash plating on the back for improved heat transfer and grip in the housing
- 3/4-grooved main bearings to optimize load-carrying surface area and oil flow
- tight, consistent wall tolerances to help maintain consistent clearances
Suitable for: Alfa Romeo 147 I (937), Alfa Romeo 159 I (939), Alfa Romeo Brera I (939), Alfa Romeo GT I (937), Alfa Romeo Spider II (939), Opel Signum I (Z03), Opel Vectra C (Z02), Saab 9-3 II (YS3F), Saab 9-4X I (YB3G), Vauxhall Signum I (Z/C), Vauxhall Vectra II (B).
Engines: HFV6 3.2, Z28, Z28NET, LP9, LY7 (939A.000, LY7, Z28NEL, Z28NET, LP9). 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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