Clevite MS-1706P-.25MM High Performance Main Bearing Set .25mm Undersize

The Clevite MS-1706P-.25MM is a high-performance engine crankshaft main bearing set designed for demanding applications. This .25mm undersize bearing set is part of Clevite's P-Series line, engineered specifically for performance and racing engines that require superior oil flow and extreme retention characteristics.

P-Series Performance Features:

• High crush design for maximum bearing retention in severe operating conditions
• Reduced overlay thickness to prevent overlay fatigue and "hen tracking"
• Optimized 180-degree upper shell grooving for maximum oil delivery to connecting rod bearings
• Hardened steel backing for exceptional strength and fretting resistance
• TriMetal bearing construction for legendary durability
• .25mm undersize for reground crankshafts

Application Guidance:

P-Series main bearing sets are ideal for engines experiencing rod bearing oil starvation, typically indicated by polishing, smearing, or discoloration at the bearing center. The higher eccentricity design narrows bearing contact patterns and provides increased oil flow to rod bearings. These bearings excel in extremely high RPM applications where severe rod bore distortion occurs, often showing full parting line contact with standard bearings.

Clevite's engineering research confirms that the 180-degree upper shell groove design delivers optimal bearing performance by maintaining the thickest possible oil film on lower shells while ensuring adequate oil supply to connecting rods through the upper shell groove. This design minimizes horsepower loss and peak oil film pressure compared to full-grooved or extended-groove configurations.

Technical Specifications:

• Bearing Type: Main bearing set
• Size: .25mm undersize
• Series: P-Series (High Performance)
• Construction: TriMetal with reduced overlay
• Back Material: Hardened steel
• Groove Configuration: Upper shell 180-degree groove