Clevite MS-2207A Engine Crankshaft Main Bearing Set

The Clevite MS-2207A is a precision-engineered main bearing set designed to provide reliable crankshaft support and optimal oil film development for engine protection. This bearing set features carefully engineered oil grooving designed to balance connecting rod lubrication needs while maximizing bearing life and performance.

Key Features:

• Precision TriMetal bearing construction for strength and durability
• Optimized 180-degree upper shell grooving for connecting rod oil supply
• Ungrooved lower shells for maximum oil film thickness and load capacity
• High crush design for maximum bearing retention
• Reduced overlay thickness to prevent overlay fatigue
• Engineered to minimize horsepower loss and peak oil film pressure

Design Engineering:

Clevite's main bearing design focuses on maintaining the critical oil film that separates the bearing from the shaft surface. During rotation, the crankshaft pulls oil into the loaded bearing area, creating a hydrodynamic wedge. The upper shell features a 180-degree groove that efficiently supplies oil to connecting rod bearings while preserving optimal film thickness. Lower shells remain ungrooved to maximize the oil film in high-load areas, providing greater safety margins and extended bearing life.

Clevite Performance Series Overview:

This bearing may be available in multiple performance series to match your specific engine requirements:

• P-Series: Maximum eccentricity with full groove option, hardened steel back rod bearings, ideal for extreme RPM applications and maximum rod bearing oil flow
• H-Series: Medium eccentricity with enlarged chamfers for oversized fillets, non-flash plated for better seating, optimal for medium to high RPM engines
• K-Series: TriArmor moly/graphite surface treatment for enhanced wear protection across broad temperature ranges and marginal oil flow conditions
• V-Series: Lead-indium overlay for superior conformability, single-piece thrust bearing construction
• M-Series: Micro bearing with thick babbitt lining for extreme conformability in engines with severe crankshaft deflection

Application Notes:

Proper bearing selection depends on operating conditions, RPM range, crankshaft fillet size, and bearing contact pattern requirements. H-Series bearings are recommended as the starting point for most high-performance applications. Contact patterns should ideally cover two-thirds to three-quarters of the bearing surface for optimal performance and longevity.