Mahle Rings Perf Plasma Steel Top Ring 4.155in x 1.0MM .143in RW HVOF Moly Ring Set (48 Qty Bulk Pk)

Mahle is a well-known name in the engine parts world, often supplying original equipment to manufacturers. This particular set of top piston rings, part number 3011072B, carries that legacy forward for performance builds. These rings are designed for a 4.155-inch bore and feature a 1.0mm top ring thickness with a 3.6mm (0.143 inch) depth. They utilize a plasma-moly coating applied via HVOF (High Velocity Oxygen Fuel) thermal spray, a process that creates a very dense and well-bonded layer for improved durability and reduced friction.

The plasma-moly coating on these top rings is a key feature for performance applications. It's known for its ability to withstand higher cylinder pressures and temperatures compared to standard cast iron rings. The HVOF application ensures this coating is exceptionally hard and wear-resistant, which helps maintain a good seal against the cylinder wall over a longer service life, even under demanding conditions. This bulk pack contains 48 rings, making it suitable for engine builders working on multiple engines or those who prefer to have spares on hand.

When rebuilding an engine, especially one intended for performance, the piston rings are critical for sealing the combustion chamber, controlling oil consumption, and transferring heat from the piston to the cylinder wall. These Mahle rings are built to handle those responsibilities. Remember that these rings are not CARB approved and cannot be shipped to California.