MAHLE 3030971B Plain Ring Set 4.0650in Bore Gas Nitride Steel 3.0mm Oil Ring

The MAHLE 3030971B Plain Ring Set is a high-performance piston ring assembly engineered for demanding applications including supercharged, turbocharged, and nitrous oxide engines. This set features advanced gas nitrided steel construction designed to withstand extreme temperatures, elevated combustion pressures, and minimal lubrication conditions found in high-output performance builds.

Key Specifications:

• Bore Size: 4.0650 inches (103.251mm)
• Oil Ring Width: 3.0mm
• Radial Wall Thickness: 0.127 inches
• Gas Nitrided Steel Construction for Superior Durability
• Three-Piece Oil Ring Assembly Included

Performance Features:

• Gas nitriding process creates an extremely hard, wear-resistant surface without compromising core strength
• Superior scuff resistance and reduced cylinder bore wear compared to traditional chrome-plated rings
• Optimized ring tension for improved sealing and reduced friction losses
• Enhanced oil control for both high-RPM and forced induction applications
• Designed to minimize ring flutter and maintain consistent cylinder sealing under extreme conditions

MAHLE's gas nitrided steel rings represent advanced ring technology developed through extensive simulation and computer modeling. The gas nitriding treatment provides exceptional material strength and hardness while maintaining the proper balance needed to seal effectively without damaging cylinder bores. This ring set is ideal for performance enthusiasts and racers seeking maximum durability and "free" horsepower through reduced friction and improved sealing efficiency.

The three-piece oil ring assembly features chrome-faced rails with a precision-engineered expander to provide optimal oil control across the entire RPM range. This design ensures proper lubrication while preventing excessive oil consumption, making it suitable for both street performance and competition applications.