MAHLE 4080MS-112-1 Performance Piston Ring Set 4.075in +.005 File Fit 1.0mm/1.0mm/2.0mm Single Cylinder

The MAHLE 4080MS-112-1 is a single-cylinder performance piston ring set designed for a 4.075-inch bore with a +0.005-inch file fit allowance. Featuring a thin 1.0mm/1.0mm/2.0mm ring pack configuration, this set is engineered for high-performance and race applications where minimizing friction and maximizing combustion sealing are critical.

Key Features:

• Steel top ring coated with MAHLE's patented HV385 supersonic thermal spray process for superior bonding, increased durability, and enhanced scuff resistance
• Steel Napier second ring for superior oil control and sealing efficiency
• Industry-leading CP-20 oil control ring with a 20-degree angle design that improves side-sealing and reduces oil consumption compared to conventional 90-degree tab designs
• Standard tension oil ring for reliable, consistent oil control under demanding conditions
• File fit design allows precise end-gap customization for your specific application
• Ultra-flat ring flanks and precision finish maximize ring-to-piston groove sealing
• Engineered using piston ring simulation and computer development tools to deliver measurable friction reduction — "free" horsepower you can see on the dyno
• Single cylinder set — includes all rings for one piston

Ring Specifications:

• Bore Size: 4.075 in. + 0.005 in. file fit
• Top Ring: 1.0mm — Steel with HV385 thermal spray coating
• Second Ring: 1.0mm — Steel Napier
• Oil Ring: 2.0mm — CP-20 standard tension
• Quantity: Single cylinder set (1 piston)

MAHLE's performance ring technology is race-proven, with results evident both on the dyno and on the track. This set is ideal for engine builders who demand precision fitment and premium materials in every build.