Clevite MS-2256H-10 Engine Crankshaft Main Bearing Set

The Clevite MS-2256H-10 is a high-performance engine crankshaft main bearing set from the H-Series line, designed specifically for NASCAR-type racing and all forms of competition engines. This bearing set features a medium level of eccentricity with high crush for maximum retention in demanding applications.

H-Series Performance Features:

• Medium eccentricity design optimized for medium to high RPM operation
• High crush construction for superior bearing retention under extreme loads
• Hardened steel backing with thin overlay for enhanced durability
• Enlarged chamfers providing greater crankshaft fillet clearance
• Non-flash plated for improved seating and conformability
• Standard 180-degree upper half grooving for optimal oil distribution
• TriMetal construction combining strength with proven overlay technology

Engineering Advantages:

The H-Series design balances oil film thickness with connecting rod lubrication requirements. The 180-degree groove in the upper main shell provides the best overall performance, maximizing oil film development in the loaded lower bearing while ensuring adequate oil supply to connecting rod bearings. This configuration reduces horsepower loss and peak oil film pressure compared to full-grooved designs.

Applications:

Ideal for crankshafts with oversize fillets and engines operating in medium to high RPM ranges. The H-Series is the recommended starting point when selecting performance bearings, offering contact patterns that typically cover 2/3 to 3/4 of the bearing surface for optimal load distribution. Use this bearing set when P-Series contact patterns prove too narrow or when transitioning from standard bearings to performance applications.

Clevite bearing sets are engineered to maintain proper oil film separation between bearing and shaft surfaces, with grooving designed to feed connecting rods without compromising bearing performance. The lower main shells are ungrooved to maximize oil film thickness and bearing life under high loads.