Clevite MS-1706A Engine Crankshaft Main Bearing Set

The Clevite MS-1706A is a precision-engineered crankshaft main bearing set designed for high-performance and racing applications. This bearing set features Clevite's proven tri-metal construction, providing exceptional durability and load-bearing capacity under extreme operating conditions.

Key Features:

• Tri-metal bearing construction for superior strength and wear resistance
• Optimized bearing groove design for maximum oil film protection
• High crush design for excellent bearing retention
• Reduced overlay thickness to prevent overlay fatigue
• Engineered for high-RPM performance applications
• Precision-manufactured to exact OEM specifications

Understanding Main Bearing Grooving:

Clevite's engineering research has proven that a 180-degree groove in the upper main shell provides the best overall bearing performance. The upper main shells retain grooving to supply connecting rod bearings with oil, while lower main shells remain ungrooved to maintain the thickest possible oil film. This design maximizes bearing life and safety margins by allowing the crankshaft to ride on a continuous oil film, similar to hydroplaning.

Clevite Performance Series Guide:

P-Series Bearings: Feature maximum eccentricity for extreme RPM applications, full grooved main sets for maximum oil flow, hardened steel backing, and high crush retention. Ideal when severe rod bore close-in occurs or when increased oiling to rod bearings is required.

H-Series Bearings: Developed for NASCAR-type racing with medium eccentricity, enlarged chamfers for greater fillet clearance, and no flash plating for improved seating. Available in 180-degree or 360-degree grooving configurations. Best all-around choice for most high-performance applications with contact patterns covering 2/3 to 3/4 of the bearing surface.

K-Series Bearings: Feature proprietary moly/graphite TriArmor surface treatment with PTFE carrier material for superior start-up protection and high-load anti-wear performance across broad temperature ranges. Ideal for marginal oil flow conditions.

V-Series Bearings: Utilize lead-indium overlay for enhanced conformability with slightly reduced wear resistance compared to lead-tin-copper overlay. Single-piece thrust bearing design with low to medium eccentricity and hardened steel backing.

M-Series Bearings: Micro bearings with .006-inch thick babbitt lining offering maximum conformability for engines experiencing severe crankshaft deflection and edge loading. Designed for specialized applications requiring frequent inspection and maintenance.

This main bearing set represents Clevite's decades of bearing technology development, providing racers and engine builders with proven performance and reliability.