MAHLE 4000MS Performance Piston Ring Set 4.000" Bore 1/16" 1/16" 3/16" Drop-In Standard Tension

The MAHLE 4000MS is a performance piston ring set designed for a 4.000-inch bore application. This is a drop-in, standard tension ring package configured in a 1/16", 1/16", 3/16" ring thickness layout, making it compatible with a wide range of performance and racing engine builds without the need for custom gap filing.

MAHLE engineered these rings using advanced piston ring simulation and computer-aided development tools to minimize friction and deliver measurable power gains. The ultra-flat ring flank geometry maximizes the sealing surface between the ring and piston groove for improved combustion efficiency.

Ring Construction:

• Top Ring: Positive-twist ductile iron with a barrel face profile and plasma-moly inlay for enhanced wear resistance and cylinder wall sealing
• Second Ring: Reverse-twist tapered-face cast iron design that acts as a check valve to manage combustion blowby and provide superior oil control
• Oil Ring: 3-piece standard tension assembly for consistent oil film control across the cylinder wall

Specifications:

• Bore Size: 4.000"
• Top Ring Thickness: 1/16"
• Second Ring Thickness: 1/16"
• Oil Ring Width: 3/16"
• Ring Fit: Drop-In (pre-gapped)
• Oil Ring Tension: Standard
• Quantity: 8-cylinder set

MAHLE also offers coordinated ring sets in 1.5mm/1.5mm/3.0mm and ultra-low friction 0.043"/0.043"/3.0mm configurations for builders seeking thinner ring packages. The 4000MS is an ideal choice for performance street and competition engine builds where reliable sealing and low-friction operation are critical.