Clevite MS-829P-1 P-Series High Performance Main Bearing Set

The Clevite 77 MS-829P-1 is a P-Series high performance main bearing set designed for racing and high-performance engine applications requiring maximum oil flow to connecting rod bearings. This bearing set features full 360-degree grooving in the upper shells to maximize oil delivery to the rods, making it ideal for engines experiencing rod bearing oil starvation.

P-Series Design Features:

• Full groove configuration for maximum oil flow to connecting rod bearings
• High crush design for maximum bearing retention in the housing
• Reduced overlay thickness to prevent overlay fatigue and hen tracking
• Greater eccentricity to narrow bearing contact patterns and improve oiling
• Tri-metal construction with lead-tin-copper overlay for durability
• Non-flash plated steel back for improved seating characteristics

When to Use P-Series Main Bearings:

P-Series main bearing sets are recommended when higher eccentricity is needed to narrow bearing contact patterns and provide increased oil delivery to rod bearings. These bearings are particularly beneficial in applications where rod bearing oil starvation is evident, typically indicated by polishing, smearing, or discoloration concentrated at the axial center of the rod bearings. The full groove design ensures connecting rods receive adequate lubrication even under extreme operating conditions.

Performance Engineering:

Clevite's research into main bearing groove design confirms that bearing grooving affects the oil film thickness that separates the bearing from the crankshaft. While the upper main shell requires grooving to supply oil to the connecting rods, the lower shell performs best without grooving, allowing a thicker oil film for improved load capacity and bearing life. The P-Series full groove design prioritizes maximum oil flow over minimum friction, making it the right choice for applications where rod oiling is critical.

This main bearing set is engineered for serious performance applications including drag racing, road racing, and other high-RPM competition use where conventional bearing designs may result in inadequate rod bearing lubrication.