Clevite MS-1718P-.25MM Performance Main Bearing Set Undersize

The Clevite MS-1718P-.25MM is a high-performance main bearing set designed for demanding racing and performance engine applications. This undersize bearing set (.25mm) is part of Clevite's renowned P-Series line, engineered specifically for extreme RPM conditions and maximum oil delivery to connecting rod bearings.

P-Series Performance Features:

• Full groove design maximizes oil flow to rod bearings for superior lubrication
• High crush construction ensures maximum retention under severe operating conditions
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel back provides added strength and resistance to fretting
• Higher eccentricity design narrows bearing contact patterns and increases rod bearing oiling
• Legendary Clevite TriMetal bearing construction for strength and durability

Technical Design:

This bearing set features Clevite's proven 180-degree groove in the upper main shell, which research has demonstrated provides the best overall bearing performance. The upper shells, which experience lower loads than lower shells, retain the oil groove to supply connecting rods with oil, while the design optimizes oil film thickness for improved safety margin and bearing life.

Ideal Applications:

P-Series main bearings are specifically recommended where higher eccentricity is desired to narrow bearing contact patterns and provide increased oiling to rod bearings. Use these bearings when rod bearing oil starvation is indicated by polishing and smearing of bearing surfaces, possibly with discoloration concentrated at the axial center. This bearing set is ideal for extreme high-RPM racing applications where maximum oil flow and retention are critical.

What's Included:

Complete main bearing set with upper and lower shells for one engine application.