MAHLE 3922MS-112-4 File Fit Piston Ring Set - 3.917 0.005 1.0/1.0/2.0mm 4-Cylinder

The MAHLE 3922MS-112-4 is a complete file-fit piston ring set designed for 4-cylinder engines with a nominal bore diameter of 3.917 inches (+0.005" oversize). This ring set features a 1.0mm top compression ring, 1.0mm second compression ring, and a 2.0mm oil control ring, making it well-suited for performance engine builds and precision rebuilds that demand exact end-gap fitment.

Key Features:

• Bore Diameter: 3.917" with +0.005" oversize for precise bore matching
• Ring Widths: 1.0mm top compression / 1.0mm second compression / 2.0mm oil control
• File Fit Design: Allows the builder to custom-fit ring end gaps to exact specifications for the application
• 4-Cylinder Set: Includes all rings required for a complete 4-cylinder engine
• MAHLE Quality: Manufactured to OEM-grade tolerances for reliable sealing, oil control, and long service life
• Compatible with both naturally aspirated and forced induction performance builds where precise gap control is critical

MAHLE is a globally recognized OEM and aftermarket supplier trusted by professional engine builders. File-fit rings are the preferred choice for high-performance and racing applications, as they allow the installer to precisely set the end gap to match specific bore dimensions, clearances, and power levels. Each ring in this set is manufactured to strict dimensional tolerances to ensure consistent sealing performance and minimized blow-by.