MAHLE 3150036-040 Plasma-Moly Precision-Ground Performance Piston Ring Set 4.040 in. Bore

The MAHLE 3150036-040 is a plasma-moly precision-ground performance piston ring set designed for 8-cylinder engines with a 4.040-inch bore. Featuring ring widths of 1/16 in. (top), 1/16 in. (second), and 3/16 in. (oil), this set delivers the combustion sealing efficiency and oil control demanded by high-performance and racing applications.

Key Features:

• Plasma-moly top ring: Barrel-faced design promotes instant break-in and maintains consistent contact with the cylinder wall as the piston rocks at TDC and BDC
• Napier THG (Taper Hook Groove) second ring: Acts as a check valve to relieve combustion pressure buildup under the top ring, while providing superior oil scraping and reservoir action on each down stroke
• CP-20 oil control ring: Named for its 20-degree ear angle, this exclusive design delivers maximum cylinder wall sealing and conformability
• Reduced Radial Wall (RRW) top rings: Lowers tension load on the cylinder wall, supports top ring placement higher on the piston, and helps maximize power output
• 3-piece oil ring assembly: Stainless steel expander between two chrome-faced steel rails provides a high degree of bore conformability
• Foolproof installation: Rings are engineered so they cannot be installed incorrectly, saving time and preventing costly errors
• High-strength materials: Special ring face contours and torsional designs ensure optimum compression sealing and long-term oil control

MAHLE is the world's largest piston ring manufacturer, with over a century of experience supplying OE and aftermarket applications. Over 60% of current production engines built in North America use MAHLE pistons or rings. The 3150036-040 set is sold as a complete set for one 8-cylinder engine and is intended for performance and racing use. Note: Low-tension oil ring sets are not recommended for street use without a vacuum pump.