MAHLE Plasma-Moly Piston Ring Set Bore

MAHLE Plasma-Moly piston ring sets are performance engine piston rings. They are built to maximize combustion sealing, improve oil control, and hold up under demanding use. They suit engine builders and racers who want durable, high-quality rings for performance and high-output engines.

Key Features:

• Plasma-moly faced top rings: The plasma-moly facing resists wear, scuffing and fatigue, so the rings last longer.
• High-strength steel construction: Steel top ring sets use SAE 9254 steel with a proprietary plasma face coating. This helps extend ring life, reduce side wear, resist ring breakage and limit groove pound-out.
• Ductile iron options: Ductile ring sets are designed for serious racing. They reduce friction and help maximize horsepower and oil control.
• Low-friction designs: Reduced radial wall (RRW) top rings and CP-20 oil rings improve conformability to the cylinder wall and lower tension.
• Better sealing and oil control: The designs help reduce blow-by and improve oil economy, with some sets using a Napier hook-groove second ring that scrapes oil from the cylinder wall.
• Choice of tension and fit: Standard and low tension options are offered, along with file-fit and pre-gapped versions, depending on the part number.

MAHLE is a leading piston and ring manufacturer. Its ring designs are developed with advanced simulation and engineering tools to reduce friction and increase power. Ring sets with low or ultra-low tension oil rings are not recommended for street use. They perform best with a vacuum pump.