MAHLE 4445MS Performance Piston Ring Set File Fit - 4.440 005 1/16 1/16 3/16 8-Cylinder

The MAHLE 4445MS is a performance-grade, file-fit piston ring set designed for an 8-cylinder engine with a 4.440" bore (+.005" oversize). The three-ring pack consists of a 1/16" top compression ring, a 1/16" second ring, and a 3/16" oil control ring, providing a complete solution for high-performance engine builds and rebuilds.

Key Features:

• Bore Size: 4.440" with +.005" oversize file-fit design for precise gap tuning
• Ring Pack: 1/16" top ring / 1/16" second ring / 3/16" oil control ring
• Top Ring: Positive twist ductile iron, barrel faced with plasma-moly inlay for superior sealing and scuff resistance
• Second Ring: Reverse twist, taper-faced cast iron for enhanced oil control and groove side sealing
• Oil Control Ring: Standard tension 3/16" assembly for reliable oil management
• File Fit: Allows the engine builder to custom-fit ring end gaps to exact specifications for the application
• Sold as an 8-cylinder kit (one set per cylinder, 8 sets total)

MAHLE pioneered the use of piston ring simulation and computer development tools to engineer rings that deliver measurable horsepower gains by minimizing friction. Ultra-flat ring flanks and precision finishing maximize ring-to-piston groove sealing for reduced blowby and improved combustion efficiency. The difference is proven on the dyno and on the track.