MAHLE 4030MS-112 File Fit Piston Ring Set - 4.025 005 1.0mm 1.0mm 2.0mm

The MAHLE 4030MS-112 is a premium file-fit piston ring set designed for precise engine building and performance applications. This ring set features a 4.025-inch bore diameter with an additional .005-inch oversize, providing engine builders the flexibility to custom-fit rings to exact cylinder specifications.

Ring Configuration:

• Top compression ring: 1.0mm thickness
• Second compression ring: 1.0mm thickness
• Oil control ring: 2.0mm thickness
• File-fit design allows custom end-gap adjustment for optimal sealing

Key Features:

• Precision-manufactured by MAHLE, a leading OEM piston ring supplier
• File-fit ends enable precise gap fitting to match cylinder bore tolerances
• Metric ring widths suitable for modern engine designs
• Oversize diameter accommodates machined or worn cylinders
• Professional-grade quality for racing, performance, and rebuild applications

File-fit piston rings require careful measurement and filing of the ring end gaps to achieve proper clearance within the cylinder bore. This allows engine builders to compensate for manufacturing tolerances and achieve optimal ring seal for maximum compression and oil control.