MAHLE 4170ML Piston Ring Set Bore File Fit - 4.165 1/16 1/16 3/16

The MAHLE 4170ML is a high-performance piston ring set designed for 4.165" bore engines with a +0.005" oversize tolerance. This file-fit ring set features MAHLE's advanced low-tension design that minimizes friction to deliver measurable horsepower gains on the dyno and improved performance on the track.

Ring Configuration:

• Ring dimensions: 1/16" (top), 1/16" (second), 3/16" (oil ring)
• Top ring: Ductile iron with plasma moly coating and barrel face profile for superior sealing
• Second ring: Cast iron with reverse twist design for optimal oil control
• Oil ring: 3-piece low-tension construction

Key Features:

• File-fit design allows precise end-gap customization for your application
• Low-tension construction reduces friction and frees up horsepower
• Ultra-flat ring flanks maximize ring-to-piston sealing efficiency
• Computer-developed using advanced piston ring simulation technology
• 4.165" bore diameter with +0.005" tolerance

MAHLE pioneered the use of computer simulation and development tools to engineer piston rings that deliver free horsepower through friction reduction. This ring set represents decades of racing and performance engine expertise, making it an excellent choice for high-performance rebuilds and racing applications.