Piston Ring Set 4.155 Bore 1.0 1.0 2.0mm

The MAHLE PISTONS Piston Ring Set 4.155 Bore 1.0 1.0 2.0mm (Part Number 4155MS-112) is a precision-engineered performance series ring set designed for high-performance and racing applications. This file-fit piston ring kit delivers exact bore compatibility and controlled compression, making it the choice for builders who demand precision fitment and repeatable ring seal characteristics across multiple cylinder applications.

Constructed from plasma-moly coated steel, this 8-cylinder ring set features a 1.0mm top ring, 1.0mm second ring, and 2.0mm oil ring thickness configuration with standard tension characteristics. The plasma moly coating provides superior wear resistance and reduces friction during break-in and sustained operation. File fit rings require hand-fitting to each piston, ensuring optimal gap clearance and preventing blowby while maximizing seal integrity. The 4.155-inch bore specification accommodates larger-displacement engine builds typical in performance small-block and big-block platforms.

This ring set suits engine builders, performance technicians, and serious enthusiasts rebuilding high-output naturally aspirated or forced-induction engines. The standard tension profile balances blowby control with cylinder wall wear management—critical for long-term durability in race engines, marine power plants, and street performance builds. MAHLE's precision manufacturing ensures consistent ring geometry and coating quality, reducing variables during engine assembly and initial break-in phases.

Performance piston ring selection requires matching bore size, ring thickness, coating type, and tension to the specific engine platform and intended duty cycle. This 4.155-inch bore file-fit ring set is engineered for applications where precision fitment and controlled compression characteristics are non-negotiable.