Clevite MS-115P-30 Main Bearing Set High Performance P-Series

The Clevite 77 MS-115P-30 is a high-performance main bearing set designed for demanding racing and competition engine applications. This P-Series bearing set features full groove design to maximize oil flow to connecting rod bearings, making it ideal for engines requiring enhanced lubrication under extreme conditions.

P-Series Performance Features:

• Full grooved design maximizes oil delivery to rod bearings
• High crush design for maximum bearing retention
• Reduced overlay thickness prevents overlay fatigue and hen tracking
• Hardened steel back construction for added strength and fretting resistance
• Greater eccentricity to narrow bearing contact patterns
• TriMetal bearing construction for legendary durability

Optimal Applications:

P-Series main bearing sets are engineered for performance engines experiencing rod bearing oil starvation, typically indicated by bearing surface polishing and smearing with discoloration at the axial center. The higher eccentricity design narrows bearing contact patterns while providing increased oiling capacity to connecting rod bearings. These bearings are particularly effective in extreme RPM applications where rod bore close-in causes severe wear patterns from parting line to parting line.

Technical Design:

The bearing features a 180-degree groove in the upper main shell, which testing has proven to be the optimal design for performance applications. This configuration maintains the best oil film thickness while ensuring adequate oil supply to the connecting rods. The lower main shells are ungrooved, allowing for a thicker oil film and improved bearing life under heavy loads.

Clevite 77 bearings are manufactured without flash plating for better seating and feature enlarged chamfers for enhanced crankshaft fillet clearance. The reduced overlay thickness is specifically engineered to prevent the overlay fatigue commonly seen in high-performance applications.