Clevite MS-909A Engine Crankshaft Main Bearing Set

The Clevite MS-909A is a high-performance engine crankshaft main bearing set designed for demanding automotive applications. This precision-engineered bearing set provides superior lubrication and load-bearing capability to protect your engine's crankshaft under high-stress conditions.

Main Bearing Design and Oil Film Technology:

Clevite main bearings utilize advanced grooving design to optimize oil film development while maintaining oil delivery to connecting rod bearings. The bearing design creates a hydrodynamic oil film as the crankshaft rotates, similar to hydroplaning, which keeps the bearing surface separated from the shaft. The upper main shells feature a 180-degree groove to supply oil to the connecting rods, while the lower main shells remain ungrooved to maximize oil film thickness and bearing life. This configuration provides the best balance of lubrication and load-bearing performance.

Key Features:

• Precision-engineered main bearing set for crankshaft protection
• Optimized groove design for superior oil flow management
• TriMetal bearing construction for strength and durability
• High crush design for maximum retention in bearing bores
• Reduced overlay thickness to prevent fatigue and tracking
• Designed to develop thick oil film for extended bearing life

Clevite Performance Series Overview:

Clevite offers multiple bearing series to match specific performance requirements. The P-Series features maximum eccentricity and full grooving for extreme RPM applications where rod bore close-in occurs. The H-Series provides medium eccentricity with enlarged chamfers for oversize crankshaft fillets, ideal for NASCAR and competition engines. The K-Series includes proprietary moly/graphite TriArmor coating for enhanced protection under high loads. The V-Series uses lead-indium overlay for superior conformability. The M-Series features thick babbitt lining for applications with severe crankshaft deflection.

Clevite bearings are engineered without flash plating for better seating and feature hardened steel backs for added strength. Contact patterns should ideally cover 2/3 to 3/4 of the bearing surface for optimal performance. Professional installation and regular inspection are recommended for all high-performance bearing applications.