Mahle Rings Perf Plasma Moly Steel Top Comp Ring 4.605in x 1.0MM .143 RW Ring Set (48 Qty Bulk Pack)

When you're rebuilding a high-performance engine, getting the piston ring seal just right is critical for power and longevity. These Mahle OE Plasma Moly top compression rings are built for serious engine work, designed to handle the demands of boosted or high-compression applications. They feature a plasma-moly face, which is a well-known material for its wear resistance and ability to create a solid seal against the cylinder wall, even under extreme heat and pressure.

The 1.0mm thickness for the top ring is a common spec for performance builds, offering a good balance between sealing surface and piston crown volume. The 4.605-inch bore size means these are intended for larger displacement engines, often found in heavy-duty trucks or specialized performance vehicles. Mahle has a long history in engine components, and these rings reflect that experience with a focus on durability and consistent performance. The plasma-moly coating helps reduce friction compared to plain cast iron rings, which can contribute to slightly improved efficiency and reduced cylinder wall wear over time.

This is a bulk pack containing 48 rings, making it ideal for engine builders who work on multiple engines or need spares for a large project. Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your specific engine build plans and manufacturer recommendations to ensure these rings are the correct choice for your application.