ACL Bearings 7M1532H-.25 Race Series Tri-Metal Main Bearings

ACL Race Series Main Bearings deliver exceptional performance for high-RPM racing engines through advanced tri-metal construction and precision engineering. These upper and lower main bearings are designed to handle extreme loads and temperatures in competition environments.

Key Features:

• High strength overlay plate with reduced thickness for improved fatigue properties under sustained high loads
• Hardened steel backs on all bearings to improve support of the bearing lining and assist with bearing retention in the housing
• Increased crush for improved bearing retention and stability during high-RPM operation
• Elimination of flash plating on the back of bearings to improve heat transfer and maximize grip between bearings and housing
• Increased eccentricity to compensate for bore distortion at high RPM and assist in the formation of hydrodynamic oil films
• 3/4 grooved design to optimize bearing load carrying surface area and oil flow to connecting rod bearings
• Tight consistent wall tolerances to help maintain precise clearances for optimal performance
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts

The -.25mm undersize designation allows for crankshaft grinding and rebuilding applications. ACL's tri-metal construction combines a steel backing, high-strength intermediate layer, and performance overlay for superior durability in racing conditions.