MAHLE 3150139.005 Plasma-Moly Piston Ring Set 4.005 Inch Bore

The MAHLE 3150139.005 is a high-performance plasma-moly piston ring set designed for engines with a 4.005 inch bore diameter (standard bore plus .005 inch oversize). This precision-engineered ring set features 1/16 inch, 1/16 inch, and 3.0mm ring widths with file-fit ends and standard tension design, constructed from durable carbon steel material.

Advanced Plasma-Moly Technology:

• Plasma-moly face coating provides superior wear resistance and extended service life
• Barrel-faced top ring ensures instant break-in and maintains consistent cylinder wall contact
• Napier THG (tapered hook groove) second compression ring delivers superior oil control
• CP-20 three-piece oil control ring with exclusive 20-degree ear angle for optimal cylinder wall sealing
• File-fit design allows precise end gap adjustment for proper installation

Performance Features:

• Engineered for street, racing, and marine applications
• Standard tension design suitable for most performance builds
• Carbon steel construction provides excellent strength and durability
• Precision-manufactured to strict tolerances for maximum sealing efficiency
• Reduces friction for improved horsepower and fuel economy

MAHLE Original performance piston rings are among the most technically advanced and rigorously tested in the industry, designed to withstand higher RPM, increased compression ratios, and extreme operating temperatures. This complete ring set includes all rings needed for one piston and is ideal for engine rebuilds, performance upgrades, and racing applications requiring oversized pistons.