Mahle MS 4.025in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

Mahle is well-known for their high-performance engine components, and these MS file-fit piston rings are a prime example of their commitment to engine builders. These rings are designed for custom engine builds where you need to precisely set the ring gap to match your specific engine's requirements. The 4.025-inch bore size with a +.005-inch oversize allows for fine-tuning in applications that might have had a previous bore or require a slightly larger cylinder diameter.

This set features a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil ring. The 'file fit' designation means you'll need to carefully file the ends of the top and second rings to achieve the exact gap specified in your engine build plans. This level of adjustability is crucial for optimizing compression and oil control in modified or performance engines. Standard tension is used for reliable sealing across a range of applications.

Please note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine build specifications for the correct ring gap settings and installation procedures.