MAHLE 42033CP.004 Premium Piston Ring Set +0.040 Over Plasma-Moly

The MAHLE 42033CP.004 is a premium plasma-moly piston ring set engineered to OE-quality standards for engine rebuilds requiring a +0.040" (1.016mm) overbore. MAHLE is the world's largest piston ring manufacturer, and this set reflects more than a century of engineering expertise developed through direct collaboration with major global engine manufacturers.

Key Features:

• Plasma-Moly Top Compression Ring: Positive-twist ductile iron construction with a barrel-faced contact surface for efficient compression sealing and a CNC-controlled gap chamfer to minimize blowby
• Reverse-Twist Intermediate Ring: Taper-faced second ring with reverse-twist design delivers superior groove side sealing and taper race machining for enhanced cylinder wall contact
• CP-20 Oil Control Ring Assembly: Features an exclusive 20-degree ear angle for maximum side sealing against the cylinder wall, plus a chemically polished oil ring expander for improved oil drainback
• Pre-Lapped Finish: Rings are pre-lapped at the factory to seat immediately, virtually eliminating break-in time
• Optimized Ring Tension: Materials, coatings, and ring tension are precision-engineered for reduced friction and extended service life
• OE-Grade Quality: Manufactured to original equipment specifications for reliable, long-lasting performance in rebuilt engines

The MAHLE 42033CP.004 piston ring set is the preferred choice for professional engine builders and serious rebuilders who demand installer-friendly components without sacrificing durability or performance. The .004 oversize designation makes this set ideal for cylinders bored to +0.040" over standard dimensions.