MAHLE 4170MS-15 Piston Ring Set Bore File Fit - 4.165 1.5mm 1.5mm 3.0mm

The MAHLE 4170MS-15 piston ring set is engineered for 4.165" bore applications with a +.005" tolerance, featuring a file-fit design for precise end-gap adjustment. This three-ring configuration includes 1.5mm top and second rings with a 3.0mm oil ring assembly, utilizing standard tension specifications for balanced performance and sealing.

Ring Configuration:

• Top Ring: 1.5mm ductile iron with plasma moly coating and barrel face profile for superior wear resistance and oil control
• Second Ring: 1.5mm cast iron with reverse twist design to enhance cylinder wall sealing
• Oil Ring: 3.0mm three-piece assembly with standard tension for effective lubrication management

Key Features:

• File-fit design allows custom end-gap adjustment for optimal ring-to-cylinder fitment
• Ultra-flat ring flanks maximize ring-to-piston groove sealing and minimize blow-by
• Advanced plasma moly coating on top ring reduces friction and extends ring life
• Engineered using computer simulation and development tools to minimize friction losses
• Standard tension specifications provide reliable sealing for street and performance applications

MAHLE's precision manufacturing and advanced materials engineering deliver piston rings that reduce parasitic friction losses while maintaining excellent combustion sealing. The file-fit design is ideal for engine builders who demand precise ring end-gap control for their specific application.