Clevite MS-1946A-.25MM Main Bearing Set Oversize 0.25mm

The Clevite MS-1946A-.25MM is a high-performance engine crankshaft main bearing set designed for demanding automotive applications. This bearing set features a 0.25mm oversize dimension to accommodate machined crankshafts, providing proper oil clearance and optimal performance in rebuilt engines.

Advanced Bearing Design:

Clevite main bearings utilize optimized grooving patterns to balance oil delivery with maximum load capacity. The upper main shells feature a 180-degree groove that efficiently supplies oil to connecting rod bearings while maintaining a robust oil film. Lower main shells are ungrooved to maximize the oil film thickness, providing superior load-carrying capacity and extended bearing life under high-stress conditions.

TriMetal Construction:

Built with Clevite's legendary TriMetal design, these bearings combine a steel backing with a precision-engineered bearing material and overlay. This construction delivers exceptional strength, durability, and resistance to wear while maintaining the conformability needed for optimal crankshaft contact patterns.

Performance Features:

• High crush design ensures maximum bearing retention and prevents bearing movement
• Reduced overlay thickness to prevent overlay fatigue in high-load applications
• Optimized eccentricity for proper contact patterns covering 2/3 to 3/4 of bearing surface
• Engineered chamfers provide adequate crankshaft fillet clearance
• Precision manufacturing ensures consistent quality and fit

Application Notes:

This main bearing set is ideal for engine rebuilds requiring oversized bearings due to crankshaft machining. The 0.25mm oversize allows proper clearances to be established on journals that have been ground undersize. Clevite bearings are trusted by professional engine builders and racers worldwide for their consistent performance and reliability in both street and competition engines.

When installing, ensure proper bearing clearances are verified with plastigage or micrometers. Follow torque specifications and assembly procedures for your specific engine application.