Clevite MS-2091P-.026MM High Performance Main Bearing Set

The Clevite MS-2091P-.026MM is a precision-engineered main bearing set designed for high-performance and racing applications. This P-Series bearing features -.026MM undersize dimensions to accommodate reground crankshafts while maintaining proper oil clearances.

P-Series Performance Features:

• High eccentricity design for optimal load distribution and narrower contact patterns
• Full groove configuration maximizes oil flow to connecting rod bearings
• High crush design ensures maximum bearing retention under extreme conditions
• Reduced overlay thickness prevents overlay fatigue and hen tracking
• Hardened steel backing provides added strength and fretting resistance
• TriMetal construction delivers legendary Clevite durability

Engineered for Demanding Applications:

P-Series bearings are ideal for engines operating at extremely high RPMs where severe rod bore distortion occurs. The increased eccentricity helps narrow bearing contact patterns to the optimal 2/3 to 3/4 coverage range, while the full grooving prevents rod bearing oil starvation—a common failure indicated by polishing, smearing, and discoloration at the bearing's axial center.

Advanced Oil Film Technology:

This bearing set features optimized 180-degree grooving in the upper main shells, providing the best balance of oil delivery to connecting rods while maintaining maximum oil film thickness on loaded bearing surfaces. The ungrooved lower shells develop thicker hydrodynamic oil films for improved safety margins and extended bearing life under racing conditions.

The -.026MM undersize specification makes this set compatible with crankshafts that have been ground .026 millimeters undersize during rebuilding or performance machining processes.