Mahle Rings Performance Plasma Steel Top Ring 4.020in x 1.0MM .143in RW HVOF Moly Ring Set

The top ring in this Mahle set features a plasma-sprayed steel construction, a tough material chosen for its durability and ability to handle the heat and pressure found in the combustion chamber. This specific ring is designed for a 4.020-inch bore, meaning it's built to create a tight seal against the cylinder wall. This seal is critical for keeping combustion gases from blowing past the piston and for preventing oil from entering the combustion chamber.

The ring set uses a 1.0mm top ring and a 0.143-inch oil ring width, which are common dimensions for many performance applications. The HVOF (High-Velocity Oxygen Fuel) Moly coating on the ring surface helps reduce friction and wear, allowing the rings to glide smoothly against the cylinder walls. This improved surface contact helps maintain consistent compression and reduces the strain on your engine components over time.