Clevite MS-1949P-.25MM Main Bearing Set Undersize Performance

The Clevite MS-1949P-.25MM is a high-performance main bearing set designed for demanding engine applications. This undersize bearing set (.25mm) is engineered to provide optimal crankshaft support and lubrication in performance and racing engines.

Advanced Bearing Design:

This main bearing set features carefully engineered oil grooving to balance lubrication delivery with optimal oil film thickness. The upper main shells incorporate a 180-degree groove that efficiently supplies oil to connecting rod bearings while maintaining maximum film strength in the loaded lower bearing shells, which remain ungrooved for superior load capacity and durability.

P-Series Performance Features:

• High crush design for maximum bearing retention in performance applications
• Reduced overlay thickness to prevent overlay fatigue and hen tracking
• Full groove configuration in upper shells to maximize oil flow to rod bearings
• Higher eccentricity design to narrow bearing contact patterns and improve rod bearing lubrication
• Hardened steel backing for added strength and fretting resistance
• Optimized for engines experiencing high RPM operation and increased bearing loads

Application Notes:

P-Series bearings are ideal for performance engines where maximum oil delivery to rod bearings is critical. The increased eccentricity helps prevent rod bearing oil starvation, which typically manifests as surface polishing, smearing, or discoloration concentrated at the bearing's axial center. These bearings are particularly effective in high-RPM applications where proper lubrication of connecting rod bearings is essential for reliability.

The undersize .25mm dimension accommodates crankshafts that have been ground undersize during rebuilding or performance preparation, ensuring proper bearing clearances are maintained.