MAHLE 4065MS-112-1 Piston Ring Set 4.065" Bore 1.0mm 1.0mm 2.0mm File Fit

The MAHLE 4065MS-112-1 is a premium single-cylinder piston ring set designed for high-performance engine builds requiring precise bore sizing. This file-fit ring set is engineered for a 4.060" bore with +0.005" oversize, providing a final bore diameter of 4.065".

Ring Configuration:

• Top compression ring: 1.0mm width
• Second compression ring: 1.0mm width
• Oil control ring: 2.0mm width
• Standard tension design for reliable sealing

File-Fit Design:

• Rings require end-gap filing for custom fitment
• Allows precise gap adjustment for specific engine tolerances
• Ideal for performance rebuilds and custom applications
• Ensures optimal ring seal and blowby control

MAHLE piston rings feature advanced materials and coatings for superior wear resistance, heat dissipation, and oil control. The metric ring widths (1.0/1.0/2.0mm) are common in modern performance and racing applications. This single-cylinder set is perfect for individual piston replacement or custom engine configurations.

Important: File-fit rings must be properly gapped using a ring filer before installation. Always verify ring gap specifications for your specific application.