MAHLE 3150036-065 Plasma-Moly Ductile Piston Ring Set 4.065 in. Bore +.065 Over

The MAHLE 3150036-065 is a precision-ground, plasma-moly ductile piston ring set designed for 8-cylinder engines with a 4.065-inch bore (+.065" oversize). Engineered for serious performance and racing applications, this set delivers maximum combustion sealing and minimal frictional losses to increase horsepower and improve oil control.

Key Features:

• Plasma-moly top ring: Positive-twist ductile iron, barrel-faced construction with a proprietary plasma-moly face coating for superior tensile strength, hardness, and fatigue resistance
• Napier THG second ring: Tapered hook groove (THG) design provides superior oil control, improved combustion gas management, improved top ring stability, and enhanced sealing
• CP-20 oil control ring: Features a 20-degree ear angle — an exclusive design that delivers the best possible side seal against the cylinder wall, with a special chemical polish on the expander for enhanced oil drain-back
• Reduced radial wall (RRW) top rings: Lowers ring mass and tension, improves conformability to cylinder bore distortion, and allows the top ring groove to be positioned closer to the piston crown for reduced crevice volume
• File-fit design: Allows end gaps to be custom-fitted to specific engine requirements
• Ring thickness: 1/16 in. top, 1/16 in. second, 3/16 in. oil
• Tension: Standard tension
• Material: Carbon steel / ductile iron construction
• Sold as a set (8-cylinder kit)

MAHLE pioneered the use of piston ring simulation and computer development tools to engineer rings that minimize friction and deliver measurable power gains. The 3150036-065 ring set is well-suited for engine rebuilds, overhauls, and performance street or racing builds requiring a reliable, high-quality oversize ring set.