MAHLE 41859CP Premium Plasma-Moly Piston Ring Set Bore - 3.780

The MAHLE 41859CP Premium Piston Ring Set delivers professional-grade performance and reliability for engine rebuilds and overhauls. These installer-friendly rings are pre-lapped to seat immediately, virtually eliminating break-in time, making them ideal for professional engine builders and serious enthusiasts.

Technical Specifications:

• Bore diameter: 3.780 inches (96.012mm) - Standard
• Top compression ring: 1.5mm thickness, plasma-moly coating, carbon steel construction
• Second compression ring: 1.5mm thickness, carbon steel with reverse twist design
• Oil control ring: 3.0mm thickness, stainless steel construction
• Set includes rings for 8 cylinders
• File-fit: No (ready to install)

Advanced Features:

• Ring materials and coatings, as well as ring tension, are all optimized for reduced friction and extended life
• Compression rings feature a barrel-faced contact area for more efficient compression and CNC-controlled gap chamfer to optimize compression and reduce blow-by
• Intermediate rings have a reverse twist design for better groove side sealing, and taper race machining to enhance contact
• CP-20 oil ring assemblies feature a 20 degree ear angle for the best possible side seal against the cylinder wall
• SAE 9254 high alloy steel base material provides higher tensile and yield strength, extended fatigue resistance, and increased material hardness

Perfect Circle by MAHLE represents decades of engineering excellence in piston ring technology. The plasma-moly coating on the compression rings provides exceptional wear resistance and sealing performance under demanding operating conditions. The shallow groove design of the oil ring assembly enhances oil drain-back while maintaining optimal cylinder wall lubrication.