MAHLE 4075MS Performance Piston Ring Set Bore File Fit - 4.070 1/16 1/16 3/16

The MAHLE 4075MS is a performance piston ring set designed for a 4.070-inch bore with a +.005-inch file fit allowance. This set uses a traditional 1/16", 1/16", 3/16" ring pack configuration (top compression, second compression, and oil control), making it a direct choice for high-performance and racing engine builds requiring precise end-gap tuning.

Key Features:

• Bore Size: 4.070" nominal, file fit to 4.075"
• Ring Pack: 1/16" top ring, 1/16" second ring, 3/16" oil control ring
• File Fit Design: Allows the builder to custom-fit ring end gaps for specific power levels and applications
• Top Ring: Positive-twist ductile iron, barrel-faced with plasma-moly inlay for superior sealing and wear resistance
• Second Ring: Reverse-twist, taper-faced cast iron for effective oil scraping and compression assist
• Oil Control Ring: Three-piece standard tension assembly for reliable oil management across all RPM ranges
• Ultra-flat ring flanks: Precision-ground surfaces maximize ring-to-piston groove sealing

MAHLE pioneered the use of piston ring simulation and computer-aided development to engineer rings that minimize friction and deliver measurable power gains. The 4075MS is part of MAHLE's Standard Tension performance ring lineup, calibrated for street/strip and competition builds demanding tight tolerances and consistent combustion sealing across all cylinder bores.