Clevite MS-2220P-.25MM Engine Crankshaft Main Bearing Set

The Clevite MS-2220P-.25MM is a high-performance engine crankshaft main bearing set designed for demanding applications. This P-Series bearing set features precision-engineered construction with a 0.25mm undersize specification for use with reground crankshafts.

P-Series Performance Features:

• High eccentricity design for optimal load distribution and oil flow to connecting rod bearings
• Full groove configuration in upper shells to maximize oil delivery to rod bearings
• High crush specification for maximum retention in performance applications
• Reduced overlay thickness to prevent overlay fatigue and "hen tracking"
• Hardened steel backing for added strength and fretting resistance
• TriMetal construction for superior durability under extreme conditions

Application Guidelines:

P-Series main bearing sets are ideal for high-RPM performance and racing engines where increased oil flow to rod bearings is critical. The higher eccentricity design helps narrow bearing contact patterns and prevents rod bearing oil starvation, which typically manifests as surface polishing, smearing, or discoloration at the bearing's axial center. These bearings feature full grooved upper shells to ensure adequate lubrication reaches the connecting rod bearings under extreme operating conditions.

Technical Specifications:

• Undersize: 0.25mm (0.010 inch)
• Series: P-Series (High Performance)
• Construction: TriMetal with hardened steel back
• Groove Configuration: Full groove upper shells
• Overlay: Reduced thickness lead-tin-copper

This bearing set is engineered for engines experiencing severe rod bore close-in at extremely high RPMs, typically indicated by nearly full parting line contact with standard bearings. The P-Series design addresses these challenges with increased eccentricity and superior oiling characteristics to protect both main and rod bearings under the most demanding conditions.