MAHLE 51470CP.030 Engine Piston Ring Set +0.030" Oversize Bore

The MAHLE 51470CP.030 is a premium Original-line engine piston ring set designed for a +0.030" oversize bore application. MAHLE is the world's largest manufacturer of piston rings, and this set reflects their extensive OE engineering expertise applied directly to the aftermarket rebuild market.

These rings are pre-lapped at the factory, allowing them to seat immediately upon installation and virtually eliminating traditional break-in time. Ring materials, coatings, and tension values are all precisely optimized for reduced friction, improved sealing, and extended service life.

Key Features:

• Barrel-faced compression rings provide a more efficient compression seal and feature a CNC-controlled gap chamfer to reduce blow-by
• Intermediate (second) rings use a reverse-twist design for superior groove side sealing, combined with taper-race machining for enhanced cylinder wall contact
• CP-20 oil ring assemblies incorporate a 20-degree ear angle for optimal side sealing against the cylinder wall, plus a chemically polished expander for improved oil drain-back
• High tensile strength and excellent hardness provide stress resistance and minimal groove pound-out over the long term
• Low ring mass and optimized tension contribute to reduced friction and improved oil economy
• Pre-gapped and installer-friendly design streamlines engine assembly

MAHLE Original piston rings are engineered to meet or exceed OEM specifications, making them a trusted choice for professional engine builders and experienced DIY mechanics performing engine rebuilds or overhauls.