Clevite MS-1718P-.75MM Performance Main Bearing Set with 0.75mm Undersize

The Clevite MS-1718P-.75MM is a high-performance main bearing set featuring 0.75mm undersize dimensions for precision fitment on reground crankshafts. This P-Series bearing set is specifically engineered for performance and racing applications where maximum oil flow and extreme durability are critical.

P-Series Performance Design:

• Full groove design maximizes oil flow to connecting rod bearings
• High crush construction ensures maximum bearing retention in the engine block
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel back provides added strength and resistance to fretting
• Maximum eccentricity design narrows bearing contact patterns and increases rod bearing lubrication
• TriMetal construction with lead-tin-copper overlay for superior durability

Optimal Groove Configuration:

This bearing set features a 180-degree groove in the upper main shell, which extensive testing has proven to be the most effective design for performance engines. This configuration provides adequate oil supply to the connecting rods while maintaining the thickest possible oil film on the lower bearing shell, which experiences the highest loads. The ungrooved lower shell delivers improved bearing life and a greater safety margin compared to older full-grooved designs.

Ideal Applications:

P-Series bearings are recommended for engines experiencing extremely high RPMs that cause severe rod bore distortion and close-in. They are particularly effective when rod bearing oil starvation is indicated by polishing, smearing, or discoloration at the bearing's axial center. Use these bearings when you need higher eccentricity to control contact patterns or when maximum oil delivery to the rod bearings is essential for preventing lubrication failure.

The 0.75mm undersize dimension makes this bearing set compatible with crankshafts that have been ground 0.75mm (approximately 0.030") undersize from the original journal diameter. As with all performance bearings, proper clearance verification and careful installation are essential for optimal performance and longevity.