Mahle Rings Performance Plasma Moly Steel Top Compression Ring 4.005 x .0625 .190 RW Moly Ring Set

This is a Mahle OE Plasma Moly Steel Top Compression Ring Set, part number 3011013. These rings are designed for engine builds where improved performance and durability are key. The plasma moly coating on the top compression ring helps reduce friction and wear, which can lead to better sealing and longer engine life. This set is specifically for a 4.005 inch bore with a .0625 inch ring width and a .190 inch ring depth.

Mahle OE uses steel for these top compression rings, which offers good strength and resilience under high temperatures and pressures found in performance engines. The plasma moly coating is a well-known method for improving the ring's ability to seat properly against the cylinder wall, ensuring a solid seal. This is important for maintaining compression and preventing blow-by, especially in engines that are pushed harder than stock.

Please note that this ring set is not CARB approved and cannot be shipped to California. Always refer to manufacturer installation instructions for proper fitment and assembly procedures.