Piston Ring Set 4.155 Moly 1/16 1/16 3/16

The Piston Ring Set 4.155 Moly 1/16 1/16 3/16 from MAHLE Original is a precision-engineered component designed for complete engine rebuilds and performance restorations on 8-cylinder applications. This comprehensive kit addresses one of the most critical sealing and compression functions in any internal combustion engine, making it essential for mechanics and engine builders who demand OEM-level reliability. Proper piston ring installation directly impacts compression ratio, oil consumption, blow-by control, and overall engine longevity—making quality ring selection fundamental to successful engine work.

This piston ring set features a 4.155-inch bore specification with individually optimized ring thicknesses: 1/16-inch compression ring, 1/16-inch secondary compression ring, and 3/16-inch oil control ring. The plasma moly coating on the compression rings reduces wear during initial engine start and break-in while improving ring longevity under sustained load. Steel construction paired with moly surface treatment provides superior heat dissipation and dimensional stability across temperature cycles. The file-fit design allows for precise sizing to your specific bore, ensuring consistent gap clearances and optimal sealing geometry that factory-preset rings cannot always match.

Professional engine rebuilders and restoration specialists choose MAHLE Original rings for light-duty to standard-tension applications across naturally aspirated and lightly boosted 8-cylinder engines. Installation requires careful measurement of bore diameter to determine proper end gap clearance before final positioning. Standard tension rating suits street and marine applications where extreme pressure loads are not expected, while maintaining excellent oil control and reduced friction characteristics. This kit is manufactured to exacting OEM specifications and represents the trusted choice for technicians who prioritize engine reliability and performance longevity.