Clevite MS-829P-30 P-Series Performance Main Bearing Set

The Clevite MS-829P-30 is a high-performance P-Series main bearing set designed for racing and extreme duty applications. These bearings feature full 360-degree grooving to maximize oil flow to connecting rod bearings, making them ideal for engines that require enhanced lubrication under demanding conditions.

P-Series Performance Features:

• High crush design for maximum retention in the bore
• Reduced overlay thickness to prevent overlay fatigue and hen tracking
• Full grooved upper shells to provide optimal oil supply to rod bearings
• TriMetal construction with steel back for superior strength
• Engineered for engines experiencing rod bearing oil starvation
• Higher eccentricity design to narrow bearing contact patterns

When to Use P-Series Main Bearings:

P-Series main bearings are specifically designed for applications where increased oil flow to the connecting rods is critical. These bearings are ideal when rod bearing oil starvation is indicated by polishing, smearing, or discoloration concentrated at the axial center of the bearings. The full groove design ensures maximum oil delivery to prevent rod bearing failure in high-performance and racing engines.

Technical Design:

Clevite engineering has determined that bearing groove design significantly impacts performance. The oil film that separates bearings from the shaft surface is essential for proper operation—grooving breaks up this film similar to tire tread on pavement. While modern performance bearings typically use a 180-degree groove in the upper shell for optimal film thickness, P-Series bearings utilize full grooving to prioritize maximum oil flow to the connecting rods in demanding applications.

These bearings feature unique core part numbers distinct from standard passenger car applications and are built specifically for high-performance use. The reduced overlay thickness and high crush design work together to provide reliable retention and durability under extreme operating conditions.