Mahle Rings Performance Steel Napier THM-13 4.085 x 1.5MM .151 RW Plain Ring Set

These Mahle OE steel Napier piston rings feature a 4.085 inch bore size with 1.5mm top and second ring grooves and a .151 inch oil ring width. The Napier hook design on the second ring helps to scrape oil from the cylinder wall, improving oil control and reducing blow-by. This updated ring design is a solid option for rebuilding your engine's top end.

Constructed from durable steel, these rings are built to handle the demands of regular engine operation. The precise sizing ensures a proper seal between the piston and cylinder wall, which is critical for maintaining compression and preventing oil from entering the combustion chamber. Proper ring seal is key to engine performance and longevity.