MAHLE 51785CP.020 Perfect Circle Standard Piston Ring Set Over - 020

The MAHLE 51785CP.020 is a standard replacement piston ring set from MAHLE's Perfect Circle line, engineered to deliver OE-quality form, fit, and function for engine rebuilds and re-ring applications. Offered in a .020" oversize bore specification, this set is an ideal solution for engines with worn or freshly bored cylinders requiring oversized rings.

Key Features:

• Cast Iron Construction: Upper compression rings are cast iron or ductile cast iron with a positive twist and barrel face profile for rapid seating and effective break-in
• Superior Compression Sealing: High tensile strength and high yield strength materials provide excellent stress resistance and minimal groove pound-out over the long term
• CP-20 Oil Ring Assembly: Features an exclusive 20-degree ear angle for optimal side sealing within the piston oil ring groove, simplifying installation and improving oil control
• Low Blow-By Design: Engineered for cylinder conformability, oil economy, and effective blow-by control with low friction for reduced power loss
• OE-Derived Technology: Narrow compression rings, low-tension oil rings, and advanced ring geometries developed directly from original equipment specifications
• .020" Oversize: Designed for bores that have been machined .020" over standard dimensions

MAHLE — formerly marketed under the Perfect Circle brand — is one of the world's largest OE piston ring manufacturers, trusted by professional engine builders and automotive technicians for over 100 years. Whether you're overhauling a high-mileage engine or completing a full rebuild, the MAHLE 51785CP.020 delivers the reliability and precision needed for lasting engine performance.