MAHLE 3150049-035 Plasma-Moly Performance Piston Ring Set Bore File Fit - 4.035

MAHLE 3150049-035 is a precision-ground, plasma-moly performance piston ring set engineered for a 4.035" bore (+.035" oversize). Designed for street, racing, and marine applications, this file-fit, low-tension carbon steel ring set delivers superior compression sealing and oil control in high-demand engine environments.

Key Specifications:

• Bore Size: 4.035 in. (+.035" oversize)
• Ring Widths: 1/16 in. (top), 1/16 in. (second), 3.0mm (oil)
• Fit Type: File Fit
• Tension: Low Tension
• Material: Carbon Steel with Plasma-Moly Face Coating
• Cylinder Count: 8-Cylinder set
• Quantity: Sold as a complete set

Key Features:

• Plasma-Moly Top Ring: SAE 9254 steel combined with a proprietary plasma face coating for maximum tensile strength, hardness, and fatigue resistance — reduces side wear and minimizes groove pound-out
• Barrel-Faced Top Ring: Promotes instant break-in and maintains consistent cylinder wall contact as the piston rocks at TDC and BDC
• Napier THG (Tapered Hook Groove) Second Ring: Provides superior oil control by scraping cylinder walls on each downstroke while acting as a check valve to relieve combustion pressure buildup beneath the top ring
• CP-20 Oil Control Ring: Features a 20-degree ear angle for exceptional cylinder wall sealing; 3-piece design uses a stainless steel expander between two chrome-faced steel rails for outstanding bore conformability
• Reduced Crevice Volume: Smaller ring cross-section allows the top ring groove to be positioned closer to the piston crown, reducing unburned fuel and improving emissions performance
• Foolproof Installation: Engineered so rings cannot be installed incorrectly, saving time and preventing costly mistakes during assembly

MAHLE is the world's largest piston ring manufacturer, with over a century of OE and aftermarket engineering experience. The 3150049-035 ring set is built to handle elevated RPM, higher compression ratios, and increased operating temperatures — delivering proven performance on the street, dyno, and race track.