Clevite MS-2275A-.25MM Engine Crankshaft Main Bearing Set

The Clevite MS-2275A-.25MM is a high-performance engine crankshaft main bearing set designed for demanding applications. This bearing set features precision engineering with a .25mm undersize dimension to accommodate reground crankshafts, making it ideal for engine rebuilds and performance applications.

Key Features:

• Precision-engineered TriMetal bearing construction for superior strength and durability
• .25mm undersize dimension for reground crankshaft applications
• Optimized oil film retention for maximum bearing life and reduced wear
• High crush design ensures positive retention in bearing bores
• Reduced overlay thickness prevents overlay fatigue and hen tracking
• Upper shell features 180-degree grooving for optimal oil distribution to connecting rods
• Ungrooved lower shells maintain thicker oil film for improved load capacity

Understanding Main Bearing Design:

This bearing set utilizes Clevite's optimized grooving design, with a 180-degree groove in the upper main shell only. This configuration provides the best overall performance by maintaining oil supply to connecting rod bearings while preserving maximum oil film thickness on the loaded lower bearing shells. The ungrooved lower shells allow the crankshaft to develop a thicker hydrodynamic oil film, resulting in greater load capacity and improved bearing longevity.

Clevite Performance Series Guide:

P-Series: Features maximum eccentricity and full grooving for extreme RPM applications where severe rod bore close-in occurs. Best for maximizing oil flow to rod bearings and applications showing rod bearing oil starvation.

H-Series: Medium eccentricity design developed for NASCAR-type racing and all competition engines. Features enlarged chamfers for oversized crankshaft fillets, no flash plating for better seating, and hardened steel backing. The ideal starting point for most high-performance applications.

K-Series (TriArmor): Incorporates proprietary moly/graphite surface treatment with PTFE carrier material. Provides exceptional protection during start-up, high-load conditions, and marginal oil flow situations. Combines TriMetal construction strength with advanced coating technology.

V-Series: Features lead-indium overlay offering superior conformability with slightly reduced wear resistance compared to lead-tin-copper overlay. Ideal for applications where prior experience shows preference for lead-indium overlay characteristics.

M-Series (Micro Bearings): Special purpose bearings with .006-inch thick babbitt lining on hardened steel backing. Designed for engines experiencing severe crankshaft deflection and edge loading. Offers maximum conformability but requires frequent inspection and replacement.

This bearing set is engineered to meet the demands of performance engines while providing the reliability and quality expected from Clevite Engine Parts.