Clevite MS-2261P-.25MM Performance Main Bearing Set Oversized

The Clevite MS-2261P-.25MM is a high-performance main bearing set designed for demanding racing and performance applications. This oversized bearing set (.25mm oversize) is part of Clevite's P-Series line, engineered specifically for extreme operating conditions where maximum oil flow and bearing retention are critical.

P-Series Performance Features:

• High eccentricity design with full 360-degree grooving for maximum oil flow to rod bearings
• Hardened steel backing for exceptional strength and fretting resistance
• High crush design ensures maximum bearing retention in performance blocks
• Reduced overlay thickness prevents overlay fatigue and "hen tracking" under high loads
• TriMetal construction combines durability with excellent conformability

Optimized Bearing Geometry:

Clevite's research shows that proper bearing groove design is critical for performance. While the shaft depends on an oil film for separation from the bearing surface, excessive grooving breaks up this protective film. The P-Series full groove design balances the need to supply adequate oil to connecting rod bearings while maintaining film strength in the upper shell, which experiences lower loads than the lower shell.

Ideal Applications:

• High-RPM racing engines where rod bore close-in causes severe bearing wear
• Engines experiencing rod bearing oil starvation (indicated by polishing, smearing, or discoloration at bearing center)
• Performance builds requiring narrower bearing contact patterns and increased rod oiling
• Applications where higher eccentricity is needed to concentrate bearing contact area

This .25mm oversize bearing set is designed for crankshafts that have been ground to accommodate oversized bearings. P-Series bearings represent Clevite's original high-performance bearing technology, proven in countless racing applications where reliability and maximum oiling are non-negotiable requirements.