Clevite MS-2012P-.50MM High Performance Main Bearing Set .50mm Undersize

The Clevite MS-2012P-.50MM is a high-performance main bearing set designed for demanding racing and performance applications. This P-Series bearing set features .50mm undersize dimensions for use with reground crankshafts, providing precise fitment and optimal oil clearances in rebuilt performance engines.

P-Series Performance Design:

• Maximum eccentricity for improved oil delivery to connecting rod bearings
• Full groove upper shells to maximize oil flow in high-RPM applications
• High crush design ensures superior bearing retention under extreme loads
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel backing provides exceptional strength and fretting resistance
• Ideal for engines experiencing severe rod bore close-in at extremely high RPMs

Advanced Tri-Metal Construction:

Clevite's legendary Tri-Metal bearing technology combines a hardened steel back with a precisely engineered lining and overlay system. The optimized 180-degree groove design in the upper main shell delivers maximum oil supply to rod bearings while maintaining the thickest possible oil film on loaded bearing surfaces. Lower shells remain ungrooved to preserve critical oil film thickness and extend bearing life under high loads.

Application Notes:

P-Series main bearings are engineered for racing engines where maximum oil flow to rod bearings is critical. The higher eccentricity design narrows bearing contact patterns to optimal width while preventing rod bearing oil starvation—a common failure mode indicated by polishing, smearing, and discoloration at the bearing's axial center. These bearings are particularly well-suited for engines operating at sustained high RPM where conventional bearing designs show contact patterns extending nearly parting line to parting line.

This .50mm undersize bearing set accommodates crankshafts that have been reground .50mm (.0197") from standard journal diameter, making it essential for proper engine rebuilds following crankshaft machining operations.