Clevite MS-909H-10 High Performance Main Bearing Set

The Clevite MS-909H-10 is a high-performance main bearing set engineered for competition and high-performance engines. This H-Series bearing features optimized 180-degree upper shell grooving that maximizes oil film thickness while providing adequate oil supply to connecting rod bearings.

H-Series Performance Features:

• Medium eccentricity design for optimal contact patterns covering 2/3 to 3/4 of bearing surface
• High crush construction for maximum bearing retention
• Hardened steel back for superior strength and fretting resistance
• Thin overlay construction to prevent overlay fatigue
• Enlarged chamfers for increased crankshaft fillet clearance
• No flash plating for improved bearing seating
• Standard 180-degree upper half grooving for optimal oil film development

Technical Advantages:

The 180-degree groove design in the upper main shell provides the best overall bearing performance by maintaining thick oil films while efficiently supplying oil to connecting rods. This configuration avoids the performance penalties associated with extended grooving, which can increase peak oil film pressure and horsepower loss. The upper shell handles lower loads than the lower shell, making the groove placement ideal for this application.

Applications:

Ideal for NASCAR-type racing and all competition engines operating in medium to high RPM ranges. Particularly suited for crankshafts with oversize fillets. The H-Series is the recommended starting point for builders selecting high-performance bearings for the first time.

Construction:

Features legendary Clevite TriMetal bearing construction with lead-tin-copper overlay. The hardened steel backing provides exceptional strength while the reduced overlay thickness prevents hen tracking under severe operating conditions.