Mahle Rings Performance Plasma Steel Top Ring 3.909in x 1.0MM .143in RW HVOF Moly Ring Set

This top ring from Mahle is plasma-coated steel, measuring 3.909 inches in diameter with a 1.0mm thickness and a 0.143-inch width. The HVOF Moly coating on this ring is applied using a High Velocity Oxygen Fuel process, which creates a very dense and well-bonded layer. This advanced coating helps reduce friction and wear between the piston ring and the cylinder wall, which is crucial for maintaining good compression and oil control over time.

When you're rebuilding an engine, especially one where you're looking for reliable performance, the details on parts like piston rings really matter. Mahle has a long history in engine components, and this ring set is built to handle the demands of a performance application. The plasma steel construction offers good durability, and the specific coating is designed to work effectively with the cylinder bore to create a solid seal.

This set is intended for performance applications and is not CARB approved, meaning it cannot be shipped to California. Always refer to your vehicle's specific service manual for installation procedures and any other components you might need for your engine build.