Clevite MS-909HX High Performance Main Bearing Set

The Clevite MS-909HX is a high-performance engine crankshaft main bearing set designed for demanding racing and competition applications. This H-Series bearing features extra clearance (HX designation) with an additional .001" clearance for optimal performance with standard size crankshafts.

H-Series Performance Features:

• Medium eccentricity design with high crush for superior bearing retention
• Hardened steel back construction for maximum strength and durability
• Thin overlay material to prevent overlay fatigue and hen tracking
• Enlarged chamfers provide increased crankshaft fillet clearance
• Standard 180-degree upper half grooving for optimal oil distribution
• No flash plating for improved bearing seating and heat dissipation
• TriMetal construction combining strength with conformability

Advanced Bearing Design:

The 180-degree groove configuration in the upper main shell provides the ideal balance between oil delivery to connecting rod bearings and maintaining maximum oil film thickness. This design feeds oil to the rods while keeping the lower bearing shell ungrooved for superior load-carrying capability and extended bearing life.

Applications:

H-Series bearings are ideal for NASCAR-type racing and all forms of competition engines operating in medium to high RPM ranges. These bearings are the recommended starting point when selecting performance bearings, offering the best balance of durability and performance for crankshafts with oversize fillets. Use HX extra clearance bearings for precision select fitting and optimal clearance control.

Performance Benefits:

The medium eccentricity design produces optimal contact patterns covering 2/3 to 3/4 of the bearing surface, ensuring proper load distribution and maximum bearing life. High crush design maintains positive bearing retention even under extreme racing conditions and high-temperature operation.