MAHLE 51471CP.030 Original Engine Piston Ring Set Over - 0.030

The MAHLE Original 51471CP.030 Engine Piston Ring Set is a premium OE-replacement piston ring set engineered to meet or exceed original equipment standards for fit, form, and function. Manufactured by MAHLE — one of the world's largest OE piston ring suppliers — this set delivers the same quality found in factory assemblies, making it a trusted choice for professional engine builders and DIY rebuilders alike. The .030" over-size designation makes this set ideal for engines that have been bored 0.030" over standard to restore proper cylinder-to-ring clearance.

Key Features:

• OE Form, Fit & Function: Designed to match original equipment specifications for a precise, reliable fit with no modifications required
• Upper Compression Ring: Cast iron or ductile cast iron construction with a positive twist and barrel-face profile for fast, efficient break-in and strong cylinder sealing
• Second (Intermediate) Ring: Features superior oil control, improved combustion gas management, top ring stability, and groove side sealing to minimize blow-by and reduce power loss
• CP-20 Oil Control Ring Assembly: MAHLE's exclusive 20-degree ear angle design provides the best possible side seal in the piston oil ring groove and simplifies installation; a special chemical polish on the expander enhances oil drain-back
• Advanced Materials & Coatings: Ring materials, coatings, and tension levels are all application-optimized to reduce friction and extend service life
• Pre-Lapped Finish: Rings are pre-lapped to seat immediately upon installation, virtually eliminating traditional break-in time
• CNC-Controlled Gap Chamfer: Compression rings feature precision CNC-machined gap chamfers to optimize compression and reduce blow-by
• SAE 9254 High Alloy Steel Napier Option: MAHLE leads the industry with high-quality grey iron/ductile iron second ring technology for demanding applications

MAHLE is a global leader in piston ring technology, supplying OE programs worldwide and continuously developing the most technically advanced rings in the industry. The Original 51471CP.030 ring set is engineered to reduce friction and ring mass while minimizing engine oil consumption, delivering dependable performance and a long service life in rebuilt or re-bored engines.