MAHLE 3010978B Plasma Moly Piston Ring Set Bore - 4.090

The MAHLE 3010978B piston ring set is engineered for high-performance engine builds requiring a 4.090-inch bore diameter. This premium ring set features plasma-moly steel construction for exceptional wear resistance and durability in demanding applications.

Key Specifications:

• Bore Diameter: 4.090 inches
• Top Ring: 1.5mm plasma moly-faced steel for superior heat and wear resistance
• Second Ring: 1.5mm profile
• Oil Ring: .151" (narrow) reverse-wound design for optimal oil control
• Plasma moly coating provides enhanced scuff resistance during break-in

MAHLE is a leading OEM supplier known for precision-engineered piston rings that deliver reliable sealing, reduced blow-by, and extended engine life. The plasma moly face coating on these rings ensures excellent cylinder wall sealing while maintaining low friction characteristics. The reverse-wound oil ring design provides superior oil control across a wide range of operating conditions.

This ring set is ideal for performance rebuilds, racing applications, and high-output street engines where quality components are essential for long-term reliability.