Clevite MS-909P-1 P-Series High Performance Main Bearing Set

The Clevite MS-909P-1 is a P-Series high performance main bearing set engineered for demanding racing and high-performance engine applications. This bearing set features Clevite's proven TriMetal construction with a hardened steel backing, aluminum intermediate layer, and reduced overlay thickness to prevent overlay fatigue.

P-Series Design Features:

• Full groove design in upper shells maximizes oil flow to connecting rod bearings
• High crush design ensures maximum bearing retention under extreme conditions
• Reduced overlay thickness prevents hen tracking and overlay fatigue
• Hardened steel back provides added strength and fretting resistance
• Optimized for engines experiencing severe rod bore close-in at high RPM
• Higher eccentricity narrows bearing contact patterns and increases rod oiling

Advanced Bearing Technology:

The upper main shells feature Clevite's optimized 180-degree grooving pattern, which testing has proven delivers the best overall bearing performance. This design maintains a thick oil film for the crankshaft while efficiently feeding oil to the connecting rods. Lower shells are ungrooved to maximize oil film thickness and bearing life.

Recommended Applications:

P-Series main bearings are ideal for high-RPM racing engines where maximum oil flow to rod bearings is critical. Use these bearings when rod bearing oil starvation is evident (polishing, smearing, or discoloration at the bearing center) or when extremely high engine speeds cause severe rod bore distortion. The high eccentricity design creates narrower contact patterns that help prevent rod bearing failure in demanding applications.

This is a complete main bearing set designed for professional engine builders and serious racers who demand proven performance and reliability.