Clevite MS-2203A-.75MM Main Bearing Set Undersized

The Clevite MS-2203A-.75MM is a precision-engineered main bearing set designed for automotive engine rebuilds and performance applications. This undersized bearing set (.75mm undersize) is manufactured to accommodate reground crankshafts, providing proper clearances and optimal oil film thickness for reliable engine operation.

Understanding Main Bearing Design:

Modern main bearing technology relies on a continuous oil film to separate the bearing surface from the crankshaft. As the crankshaft rotates, it draws oil into the loaded bearing area, creating a hydrodynamic film that prevents metal-to-metal contact. Clevite's engineering demonstrates that a 180-degree groove in the upper main shell provides the optimal balance between supplying oil to connecting rod bearings while maintaining maximum oil film thickness in the lower shell, which experiences the highest loads.

Key Features:

• 0.75mm undersize dimension for use with reground crankshafts
• Precision-manufactured to OEM specifications for proper clearances
• Advanced tri-metal construction for durability and conformability
• Optimized groove design to maximize oil film support while ensuring adequate rod bearing lubrication
• High crush design for superior bearing retention
• Reduced overlay thickness to prevent overlay fatigue

Clevite Performance Series Options:

Clevite offers multiple bearing series to address specific performance requirements. The P-Series features maximum eccentricity and full grooving for extreme RPM applications. The H-Series provides medium eccentricity with enlarged chamfers for increased fillet clearance, making it ideal for most performance builds. The K-Series incorporates TriArmor moly/graphite surface treatment for enhanced protection during startup and high-load conditions. The V-Series utilizes lead-indium overlay for superior conformability, while the M-Series offers specialized babbitt lining for engines experiencing severe crankshaft deflection.

This main bearing set is manufactured to Clevite's exacting standards, ensuring proper fit, optimal clearances, and long-lasting performance in both street and competition applications.