MAHLE 4040ML-043 Piston Ring Set Bore File Fit Low Tension - 4.035 043/.043/3.0mm

The MAHLE 4040ML-043 is an ultra-low friction piston ring set designed for 4.035" bore applications with +.005" oversize tolerance. This performance-oriented ring set features file-fit ends for precise end-gap adjustment and low-tension design to minimize friction and unlock free horsepower.

Ring Configuration:

• Top Ring: .043" ductile iron with plasma moly coating and barrel face profile
• Second Ring: .043" cast iron with reverse twist design
• Oil Ring: 3.0mm three-piece low tension configuration

Performance Features:

• Low tension design reduces parasitic friction for increased power output
• Ultra-flat ring flanks maximize ring-to-piston groove sealing
• File-fit ends allow precise end-gap customization for optimal performance
• Plasma moly top ring coating provides superior wear resistance and scuff protection
• Reverse twist second ring enhances oil control and cylinder wall conformity

MAHLE pioneered advanced piston ring simulation and computer development tools to engineer rings that deliver measurable performance gains on the dyno and track. The .043/.043/3.0mm configuration represents one of the thinnest, lowest-friction ring packages available for serious performance applications.