MAHLE 4285MS-15 Performance Piston Ring Set 4.285" Bore File Fit 1.5mm 1.5mm 3.0mm 8-Cylinder

The MAHLE 4285MS-15 is a high-performance piston ring set engineered for precision engine builds. Designed for a 4.280" bore with a +.005" oversize tolerance, this complete ring set delivers professional-grade sealing and performance for 8-cylinder applications.

Technical Specifications:

• Bore Size: 4.280" + .005" (4.285" actual bore)
• Ring Thickness: 1.5mm, 1.5mm, 3.0mm (top compression, second compression, oil control)
• File Fit Design: Allows precise end gap adjustment during installation
• Standard Tension: Optimized for performance and durability
• 8-Cylinder Kit: Complete set for V8 engine builds

Construction and Materials:

• Top rings feature positive twist ductile iron with barrel-faced plasma-moly inlay for superior wear resistance
• Second rings utilize reverse twist tapered face cast iron construction
• Three-piece oil ring design with standard tension
• Ultra-flat ring flanks maximize ring-to-piston sealing contact

MAHLE pioneered advanced piston ring simulation and computer development tools to minimize friction and unlock free horsepower. These performance rings are trusted by engine builders and racers worldwide for competition and high-performance street applications. File-fit design ensures precise end gap control for optimal compression sealing and blow-by prevention.

Note: This product is not CARB-approved and cannot be sold or installed in California.