MAHLE 3150049-030 Plasma-Moly Low Tension Piston Ring Set 4.030" Bore

The MAHLE 3150049-030 is a plasma-moly low tension piston ring set designed for 8-cylinder engines with a 4.030" (+.030") bore. Engineered for performance street, racing, and marine applications, this ring set features carbon steel construction with MAHLE's proven plasma-moly face coating technology for superior durability and sealing.

Key Features:

• Plasma-Moly Steel Top Ring: Manufactured from SAE 9254 steel combined with a proprietary plasma face coating to extend service life, eliminate ring breakage, reduce side wear, and minimize groove pound-out
• Low Ring Mass: The smaller cross-section design allows the top ring groove to be positioned closer to the top of the piston, reducing crevice volume and unburned fuel
• Superior Cylinder Conformability: The smaller cross-section of the higher-strength steel greatly improves the ring's ability to conform to bore distortion common in high-output, high-RPM engines
• Napier THG (Tapered Hook Groove) Second Ring: Provides superior oil control, improved combustion gas management, improved top ring stability, and enhanced cylinder wall sealing
• CP-20 Oil Control Ring: Features a 20-degree ear angle — an exclusive design element that delivers outstanding cylinder wall sealing performance
• Low Tension Design: Reduces friction for improved power output; recommended for use with a vacuum pump in racing and performance builds
• Ring Widths: 1/16" top, 1/16" second, 3.0mm oil
• Material: Carbon steel
• Fit Type: Low tension (not pre-gapped/file fit)

MAHLE is the world's largest manufacturer of piston rings, with over a century of OEM and aftermarket engineering experience. The 3150049-030 ring set is part of the MAHLE Original Performance line, built to meet the demands of higher compression ratios, elevated operating temperatures, and sustained high-RPM use. Note: Low tension oil rings are recommended for performance/racing use and are best paired with a crankcase vacuum pump.