Mahle Rings Performance Napier THM-10 3.937 x 1.5MM Plain Ring Set

These Mahle Performance Napier piston rings are built with a 3.937 inch bore size and a 1.5mm thickness for the top and second rings, which is a common specification for many performance engine builds. The Napier hook design on the top ring helps to improve oil control and reduce blow-by, especially under demanding conditions. This set is designed to provide a solid seal between the piston and cylinder wall, which is crucial for maintaining compression and efficiently transferring power.

Mahle is a well-known name in engine components, and this ring set reflects their focus on reliable performance. The plain finish on these rings is standard for many applications and ensures proper seating against the cylinder wall. When you're rebuilding an engine, getting the piston ring seal right is key to its longevity and performance, and this set offers a well-built option for that critical job.