MAHLE 3100003.030 Performance Piston Ring Set 4.030 in. Bore File Fit 8-Cylinder

The MAHLE 3100003.030 Performance Piston Ring Set is engineered for high-performance and competition engine builds requiring precise sealing, reduced friction, and long-term durability. Designed for a 4.030-inch bore with a file-fit configuration, this set is ideal for engine builders who demand exacting gap tolerances for maximum power output.

Key Features:

• File-fit design allows engine builders to precisely set ring end gaps for their specific application
• Positive-twist ductile iron top ring with barrel-faced, plasma-moly inlay for superior compression sealing and scuff resistance
• Reverse-twist taper-faced cast iron second ring for enhanced oil scraping and sealing efficiency
• Ring pack dimensions: 1.5mm top compression ring / 1.5mm second compression ring / 3.0mm oil control ring
• Ultra-flat ring flanks machined to precision tolerances to maximize ring-to-piston groove sealing
• 8-cylinder set — includes all rings needed for a complete engine build
• Developed using MAHLE's proprietary piston ring simulation and computer development tools to minimize friction and deliver measurable horsepower gains

MAHLE pioneered the application of advanced ring simulation technology in performance engine development, producing rings that reduce parasitic drag while maintaining robust sealing under high-RPM and high-load conditions. The plasma-moly top ring face coating provides excellent break-in characteristics and long service life, even in demanding racing environments.

This ring set is built to the same exacting standards that make MAHLE a trusted OE supplier to virtually every major engine and automobile manufacturer worldwide, now brought directly to the performance aftermarket.