Mahle MS 4.020in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

Mahle is a well-known name in engine components, often supplying parts for original equipment manufacturers. This set of MS piston rings is designed for engine builders who need precise control over their piston fit during a rebuild. The rings measure 4.020 inches in bore size and are file-fit, meaning you can adjust the end gap for a custom fit to your specific cylinder bore. This is crucial for achieving proper compression and oil control, especially in performance or heavily modified engines.

This set includes three rings per piston: two compression rings and one oil ring, with specific dimensions of 1.0mm for the top two rings and 2.0mm for the oil ring. The standard tension design is suitable for a wide range of applications. Because these are file-fit rings, they require careful measurement and adjustment of the end gap to match your engine's specific bore size and intended use. This allows for an improved seal against the cylinder wall, which is essential for optimal engine performance and longevity.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's service manual for proper installation procedures and specifications when fitting piston rings.