Clevite MS-2216A-.25MM Main Bearing Set Undersize

The Clevite MS-2216A-.25MM is a precision-engineered main bearing set designed for high-performance and racing applications. This undersize bearing set (.25mm undersize on journal diameter) provides optimal clearances for reground crankshafts, ensuring proper oil film development and maximum durability under severe operating conditions.

Key Features:

• Precision undersize design (.25mm) for use with reground crankshafts
• TriMetal construction combining steel backing, aluminum alloy intermediate layer, and lead-tin-copper overlay
• Optimized 180-degree upper shell grooving for proper rod oiling while maximizing lower shell oil film thickness
• High crush design ensures maximum bearing retention and prevents bearing movement
• Reduced overlay thickness helps prevent overlay fatigue and "hen tracking" in high-load applications
• Engineered oil film characteristics for improved load capacity and durability

Engineering and Performance:

Clevite main bearings utilize proven bearing geometry to maintain a critical oil film between the bearing surface and crankshaft journal. The upper shell features a 180-degree oil groove that efficiently supplies oil to connecting rod bearings while the ungrooved lower shell develops maximum oil film thickness in the primary load zone. This design provides superior load capacity compared to fully-grooved or extended-groove configurations.

Application Notes:

This main bearing set is ideal for performance engines requiring precise clearance control. The undersize dimension accommodates crankshafts that have been ground .25mm undersize on the main journals. Proper clearance specification and measurement are essential for optimal performance and bearing life. These bearings are suitable for street performance, oval track racing, road racing, and other demanding applications where reliability and durability are critical.