BMW M3 S50, S54, M50, M52, M54, M20 / M57N / M51D25 / M21D24 ACL Race Main Bearing (Set)

When doing rods and pistons, it's a good idea to replace the rod bearings as well. ACL's high-quality rod bearings will prevent fatigue, failure, and reduce drivetrain stress through their durable and strong design.

Race series bearing features:

• Designed to withstand higher RPM conditions.
• High strength overlay plate with reduced thickness for improved fatigue properties.
• Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
• Increased crush for improved bearing retention.
• Elimination of flash plating on the back of the bearings to improve heat transfer through the bearing sand to maximize the grip between the bearings and its housing.
• Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
• 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
• Tight consistent wall tolerances to help you maintain consistent clearances.
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.