Clevite MS-909A-20 Engine Crankshaft Main Bearing Set

The Clevite MS-909A-20 is a high-performance engine crankshaft main bearing set engineered for demanding automotive applications. This precision-manufactured bearing set utilizes Clevite's proven TriMetal construction to deliver exceptional durability and performance under extreme operating conditions.

Key Features:

• TriMetal bearing construction with optimized overlay thickness for resistance to overlay fatigue
• High crush design ensures maximum bearing retention in the bore
• Engineered oil groove configuration provides optimal oil film development and rod bearing lubrication
• Hardened steel backing for superior strength and resistance to fretting
• Enlarged chamfers provide increased crankshaft fillet clearance
• Non-flash plated for improved bearing seating and retention

Application Notes:

This bearing set is designed for performance and racing engines where precise clearances and maximum durability are critical. The optimized groove design balances oil supply to connecting rod bearings while maintaining peak oil film pressure on the crankshaft journal. Ideal for medium to high RPM applications where bearing loads are substantial.

Technical Design:

Clevite main bearing sets utilize advanced engineering principles to maximize bearing life. The upper main shells feature a 180-degree groove to supply oil to the connecting rods, while the ungrooved lower shells maintain a thicker oil film for improved load capacity. This design provides an optimal balance between adequate rod oiling and maximum main bearing protection under load.

Select the appropriate bearing series based on your specific application requirements, crankshaft specifications, and operating conditions. Proper bearing clearance and contact pattern verification are essential for optimal performance and longevity.