Mahle Rings Performance Plasma Moly Steel Top Compression Ring 4.025 x .0625 .190 RW Moly Ring Set

These Mahle OE top compression rings are made from plasma-moly steel, a strong material chosen for its durability and ability to handle the heat and pressure inside an engine cylinder. They measure 4.025 inches in bore size with a ring thickness of .0625 inches and a depth of .190 inches, designed to create a tight seal between the piston and cylinder wall. This seal is crucial for maintaining proper compression, preventing combustion gases from escaping into the crankcase, and keeping oil from entering the combustion chamber.

The plasma-moly coating on these rings helps reduce friction and wear, which can extend the life of both the rings and the cylinder walls. This is particularly important in performance applications where engines are subjected to higher stresses. Mahle is a well-known name in engine components, and this ring set is built to meet the demands of a performance rebuild, ensuring reliable operation and efficient combustion.