Mahle Rings Perf Plasma Moly Steel Top Comp Ring 4.625in x 1.0MM .143 RW Ring Set (48 Qty Bulk Pack)

These Mahle OE top compression rings are made from plasma-moly steel, a strong material chosen for its durability and ability to handle high temperatures. The 1.0mm thickness is a common spec for performance applications, designed to create a tight seal in the cylinder bore. Each ring measures 4.625 inches in diameter, fitting a specific range of large-bore engines. This is a bulk pack containing 48 rings, intended for engine builders or shops working on multiple engines or high-performance builds where precision and reliability are paramount.

The plasma-moly coating on these rings is a key feature. It's applied to the face of the ring to reduce friction between the ring and the cylinder wall, which helps to improve efficiency and reduce wear over time. This coating also helps the rings seat properly against the cylinder wall, ensuring a solid seal that's crucial for maintaining compression and preventing blow-by. Because these are top compression rings, their primary job is to seal the combustion chamber, keeping the pressure where it belongs during the power stroke.

This set is a 48-quantity bulk pack, making it a practical choice for professional engine builders or those undertaking extensive engine projects. It's important to note that these rings are not CARB approved and cannot be shipped to California due to emissions regulations. Always refer to your engine's specific service manual for correct installation procedures and ring gap specifications.