Mahle MS 4.100in+.005in 1.0mm 1.0mm 2.0mm File Fit Rings

This is a Mahle MS 4.100 inch piston ring set, specifically designed for engine rebuilding applications. The set includes rings with a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil ring. These are file-fit rings, meaning they require you to gap them to your specific engine's needs during installation, which is a common practice for performance or custom builds where precise ring seal is critical. The +.005 inch sizing indicates they are intended for pistons that are slightly larger than standard bore size, allowing for a precise fit.

Mahle is a well-known name in engine components, and this ring set reflects their focus on providing parts that help achieve a solid seal between the piston and cylinder wall. A good ring seal is essential for proper compression, efficient oil control, and preventing blow-by, all of which contribute to your engine's overall performance and longevity. The file-fit nature of these rings gives you the flexibility to achieve that perfect seal, especially in modified or performance engines where standard rings might not offer the ideal clearance.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Proper installation, including correct gapping and seating, is crucial for optimal performance and engine health.