MAHLE 51622CP.020 Standard Piston Ring Set 0.020 in. Oversize

The MAHLE 51622CP.020 is a standard replacement piston ring set ground to a 0.020-inch oversize bore specification, designed for engines that have been bored or honed to restore proper cylinder clearances. As part of MAHLE's Original line — formerly known as Perfect Circle — this ring set delivers the same engineering precision and material quality found in original equipment applications.

Key Features:

• 0.020-inch (0.50mm) oversize bore sizing for use in bored or honed cylinders
• Pre-lapped rings designed to seat immediately, virtually eliminating break-in time
• Barrel-faced compression rings provide a more efficient compression seal and are CNC-controlled for optimized gap chamfer to reduce blowby
• Reverse-twist intermediate rings deliver superior groove side sealing with taper-race machining for enhanced contact
• CP-20 oil ring assembly features an exclusive 20-degree ear angle for maximum side seal against the cylinder wall, plus a specially chemically polished expander for enhanced oil drainback
• High tensile strength and high yield strength construction with low ring mass for stress resistance, minimal groove pound-out, and long service life
• Optimized ring tension and coatings reduce friction while providing excellent cylinder conformability and blow-by control

MAHLE is the world's largest manufacturer of piston rings, bringing extensive OEM research and development to every set in the Original line. The 51622CP.020 ring set is an ideal choice for engine rebuilders seeking a reliable, professional-grade replacement solution in a standard oversize configuration.