MAHLE 4250MS-112 File Fit Piston Ring Set - 4.245in 005in 1.0mm 1.0mm 2.0mm

The MAHLE 4250MS-112 is a performance file fit piston ring set designed for a 4.245-inch bore with a +.005-inch oversize, featuring a 1.0mm / 1.0mm / 2.0mm ring pack configuration. These rings are engineered for high-performance and racing engine applications where precise ring end gap control is critical to maximizing power and sealing efficiency.

Key Features:

• File Fit Design: Rings are supplied intentionally oversized, allowing the builder to custom-fit the end gap to the specific bore for optimized performance
• Top Ring: Positive-twist ductile iron construction with barrel-faced, plasma-moly inlaid surface for superior wear resistance and cylinder sealing
• Second Ring: Reverse-twist, tapered-face cast iron design for effective oil control and enhanced compression sealing
• Oil Ring: 3-piece standard tension design providing consistent oil control across the full bore
• Ultra-Flat Ring Flanks: Precision-machined flat flanks maximize ring-to-piston groove sealing contact
• Bore Size: 4.245 in. base bore, +.005 in. oversize (4.250 in. finished bore)
• Ring Thickness: 1.0mm top ring / 1.0mm second ring / 2.0mm oil ring
• Sold as a set for one 8-cylinder application (8 sets of rings)

MAHLE Motorsports has pioneered the use of piston ring simulation and computer-aided development tools to engineer rings that minimize friction and deliver measurable horsepower gains. The plasma-moly top ring coating provides outstanding scuff resistance and long service life, making this ring set a trusted choice for serious performance builds and competition engines.