Clevite MS-979A-30 High Performance Engine Crankshaft Main Bearing Set

The Clevite MS-979A-30 is a high-performance engine crankshaft main bearing set engineered for demanding applications. This bearing set utilizes Clevite's proven tri-metal construction to deliver superior strength, durability, and load-bearing capacity under extreme operating conditions.

Key Features:

• Tri-metal bearing construction with optimized overlay thickness to prevent fatigue
• Precision-engineered grooving design for optimal oil film development and lubrication
• High crush design for maximum bearing retention
• Enlarged chamfers for greater crankshaft fillet clearance
• No flash plating for improved bearing seating
• Hardened steel back for added strength and fretting resistance

Performance Engineering:

Clevite main bearings are designed with specific grooving patterns to balance oil delivery to connecting rod bearings while maintaining optimal oil film thickness. The upper main shells feature a 180-degree groove to supply oil to the connecting rods, while the lower shells remain ungrooved to maximize oil film thickness and bearing life. This configuration provides the best overall performance for high-load applications.

Application Notes:

This bearing set is ideal for performance and racing engines operating at medium to high RPM ranges. The design provides excellent protection against oil film breakdown and is engineered to handle the demands of competition use. Bearing contact patterns should ideally cover 2/3 to 3/4 of the bearing surface for optimal performance.

Quality Construction:

Clevite's tri-metal construction combines a hardened steel backing with a copper-lead intermediate layer and a precisely controlled lead-tin-copper overlay. This multi-layer design provides the strength needed to resist distortion while offering the conformability required for proper break-in and long service life.