Engine Piston Ring Set | MAH4045MS-112

The MAHLE 4045MS-112 is a professional-grade Performance Piston Ring Set designed for high-performance engine builds with a 4.040-inch bore (often a .040 overbore for engines like the Chevy 350 or various LS-series blocks).

The MAHLE 4045MS-112 Piston Ring Set is part of MAHLE’s Motorsports line, featuring their advanced ultra-thin ring technology. This set utilizes a 1.0mm, 1.0mm, 2.0mm configuration, which is engineered to significantly reduce internal friction compared to traditional thicker rings. This reduction in "drag" allows the engine to rotate more freely, effectively unlocking more horsepower and improving throttle response.

• File-Fit Precision: The "112" suffix indicates these are file-fit rings. They come with a slightly larger diameter (+.005) so an engine builder can manually grind the ring ends to a specific end gap, tailored for high-heat applications like turbocharging or nitrous.
• HV385 Thermal Coating: The top rings feature a patented plasma-moly thermal spray that provides superior scuff resistance and durability under extreme combustion temperatures.
• Superior Oil Control: The 2.0mm oil ring is designed to provide consistent tension against the cylinder wall, ensuring excellent oil scraping and preventing blue smoke or oil consumption at high RPMs.
• Ductile Iron Construction: The top ring is made of high-strength ductile iron, which is much more resistant to cracking under the stress of high-performance driving than standard cast iron.