Mahle Rings Performance Steel Napier THM-13 4.205 x .1.5MM .150RW Plain Ring Set

This set includes Mahle OE Piston Rings, specifically the THM-13 model, designed for a 4.205 inch bore. These rings are constructed from steel and feature a Napier hook design on the second ring, which helps to improve oil control and ensure a solid seal against the cylinder wall. This is important for maintaining proper compression and preventing excessive oil consumption.

The Napier hook on the second ring is a notable design feature that helps to scrape oil from the cylinder wall more effectively than a standard ring. This updated design contributes to better lubrication management within the cylinder, which can lead to improved engine performance and longevity. The specific ring dimensions are 4.205 inches for the bore, with ring thicknesses of 1.5mm for the top ring, 1.5mm for the second ring, and 0.150 inches for the oil ring.