Mahle Rings Performance Napier Steel 2nd Ring 4.035in x 1.0MM .136in RW Plain Ring Set

This Mahle OE 2nd ring set is made from steel and features a Napier hook design, which is a specific shape that helps it seal better against the cylinder wall. This design is particularly effective at controlling oil, preventing it from getting past the second compression ring and into the combustion chamber. These rings are built for a 4.035-inch bore size, with a 1.0mm top ring thickness and a 0.136-inch second ring height.

When you're rebuilding an engine, the piston rings are critical for sealing the combustion chamber, transferring heat from the piston to the cylinder wall, and controlling oil. This set uses a Napier hook on the second ring, a well-known design for its ability to scrape oil effectively. The steel construction means these rings are durable and can handle the heat and pressure inside the cylinder.