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

The MAHLE 4170MS piston ring set is engineered for 4.165" bore engines with a +.005" oversize option, featuring a file-fit design that allows precise end-gap adjustment during installation. This standard tension ring set uses MAHLE's advanced friction-reduction technology developed through piston ring simulation and computer modeling, delivering measurable horsepower gains on both the dyno and track.

Ring Configuration:

• Top Ring: Ductile iron construction with plasma moly coating and barrel face profile for superior sealing and wear resistance
• Second Ring: Cast iron reverse twist design for optimal oil control and compression sealing
• Oil Ring: 3-piece standard tension design for effective oil management
• Ring Thickness: 1/16" top, 1/16" second, 3/16" oil ring

Key Features:

• Ultra-flat ring flanks maximize ring-to-piston sealing efficiency
• File-fit design allows custom end-gap tuning for optimal performance
• Plasma moly coating on top ring reduces friction and increases durability
• Standard tension design balances sealing performance with minimal friction
• 4.165" bore diameter with .005" oversize accommodation

MAHLE's precision manufacturing ensures consistent ring geometry and surface finish, critical for proper break-in and long-term performance in high-performance and racing applications.