MAHLE 3815MS-15 Performance Piston Ring Set Bore File Fit - 3.810 1.5/1.5/3.0mm 4-Cylinder

The MAHLE 3815MS-15 is a high-performance piston ring set engineered for precision engine builds requiring a 3.810" +.005" oversized bore. This professional-grade ring package features 1.5mm, 1.5mm, and 3.0mm ring thicknesses in a file-fit configuration for precise end gap adjustment during installation.

Key Features:

• Bore size: 3.810" with +.005" oversize tolerance for optimal fit
• Ring thickness: 1.5mm top ring, 1.5mm second ring, 3.0mm oil ring
• File-fit design allows custom end gap adjustment for specific applications
• Top ring: Ductile iron with plasma-moly coating for superior wear resistance
• Second ring: Cast iron with reverse twist taper face design
• Standard tension oil ring for reliable sealing and oil control
• 4-cylinder set (rings for four pistons included)

MAHLE's advanced piston ring technology utilizes computer simulation and precision manufacturing to minimize friction while maximizing ring-to-piston sealing. The ultra-flat ring flanks ensure optimal sealing performance, translating to improved compression, reduced blow-by, and enhanced engine efficiency. The plasma-moly coating on the top ring provides exceptional durability and scuff resistance under high-performance conditions.

This ring set is ideal for engine rebuilds, performance upgrades, and racing applications where precise bore sizing and professional-quality components are essential for reliability and power output.