Clevite MS-2091P-.50MM Main Bearing Set Oversize Performance Engine Bearings

The Clevite MS-2091P-.50MM is a high-performance main bearing set designed for demanding racing and competition engines. This oversize bearing set (.50mm) provides precise crankshaft support with advanced bearing geometry optimized for high-RPM operation.

Advanced Bearing Design:

Clevite's engineering focuses on maximizing oil film thickness for improved bearing life and performance. The upper main shells feature an optimized 180-degree oil groove that supplies oil to connecting rod bearings while maintaining maximum load capacity in the lower shells. This design provides superior protection compared to older full-groove designs, which can disrupt the critical oil film that separates the bearing from the crankshaft surface.

P-Series Performance Features:

• High eccentricity design for controlled bearing contact patterns
• Full groove configuration for maximum oil flow to rod bearings
• High crush for maximum bearing retention
• Reduced overlay thickness to prevent overlay fatigue
• Hardened steel backing for added strength and fretting resistance
• Ideal for applications with rod bearing oil starvation issues

Performance Applications:

P-Series bearings are engineered for extreme high-RPM racing applications where severe rod bore distortion occurs. These bearings excel when narrower contact patterns are needed to concentrate bearing support and when increased oil delivery to rod bearings is critical. The high eccentricity design prevents the parting-line-to-parting-line contact that can occur with lower eccentricity bearings under severe loads.

Technical Construction:

Built with Clevite's legendary TriMetal construction, these bearings combine a hardened steel back with a proprietary bearing alloy and precision overlay. The reduced overlay thickness prevents the "hen tracking" fatigue pattern common in high-performance applications while maintaining excellent conformability and wear resistance.

This .50mm oversize bearing set is designed for use with crankshafts that have been ground to accommodate oversize bearings, providing proper oil clearances and bearing crush for optimal performance and longevity.