MAHLE 50220.040 Engine Piston Ring Set - 0.040 in. Oversize

The MAHLE 50220.040 is a premium engine piston ring set precision-engineered to MAHLE Original quality standards. The .040 oversize designation indicates these rings are sized for a cylinder bored 0.040 inches over standard, making them ideal for engine rebuilds where cylinders have been honed or bored to restore proper tolerances.

Key Features:

• Pre-lapped finish for immediate seating and virtually no break-in period required
• Barrel-faced compression ring contact area for efficient compression and reduced blow-by
• CNC-controlled gap chamfer on compression rings to optimize sealing performance
• Reverse-twist intermediate ring design for improved groove side sealing and enhanced cylinder wall contact
• CP-20 oil ring assembly with a 20-degree ear angle for superior side sealing against the cylinder wall
• Chemically polished oil ring expander for enhanced oil drain-back performance
• Ring materials, coatings, and tension are optimized for reduced friction and extended service life
• Manufactured to OEM specifications by the world's largest piston ring producer

MAHLE Original piston ring sets deliver high tensile strength, high yield strength, and excellent hardness with low ring mass — resulting in stress resistance, minimal groove pound-out, long service life, excellent cylinder conformability, and good blow-by control with low friction. Formerly marketed under the Perfect Circle brand name, MAHLE Original rings have been trusted by professional engine builders and automotive technicians for over 100 years.