Clevite MS-2273A-.25MM Engine Crankshaft Main Bearing Set

The Clevite MS-2273A-.25MM is a precision-engineered crankshaft main bearing set designed for performance engine applications. This bearing set features -.25MM undersize dimensions to accommodate reground crankshafts, providing proper oil clearance and optimal bearing performance after machining operations.

Engineering and Design:

Clevite main bearings utilize advanced oil film technology to maintain proper separation between the bearing surface and crankshaft. The upper main shells feature a 180-degree oil groove design, which has been proven through extensive testing to provide the best overall performance by maintaining oil film thickness while supplying adequate lubrication to connecting rod bearings. The lower shells are ungrooved to maximize oil film development and bearing load capacity, resulting in improved bearing life and greater safety margins under high-stress conditions.

Key Features:

• -.25MM undersize for reground crankshafts
• TriMetal bearing construction for strength and durability
• Optimized 180-degree upper shell grooving for balanced oiling
• Ungrooved lower shells for maximum load capacity
• High crush design for superior bearing retention
• Reduced overlay thickness to prevent fatigue and hen tracking
• Enlarged chamfers for improved crankshaft fillet clearance
• Manufactured without flash plating for better seating characteristics

Application:

This main bearing set is ideal for performance and racing engines where crankshaft grinding has been performed. The precision undersize dimensions ensure proper oil clearance restoration and optimal bearing contact patterns. Suitable for street performance, drag racing, circle track, and other high-performance applications requiring reground crankshaft accommodation.

Technical Specifications:

The bearing set utilizes Clevite's proven TriMetal construction with a hardened steel backing, intermediate layer, and lead-tin-copper overlay. This combination provides excellent wear resistance, conformability, and fatigue strength under demanding operating conditions. The bearing design promotes proper oil film development while ensuring adequate oil supply to downstream rod bearings.