SKU: MAH4005MS-15
MPN: 4005MS-15
The MAHLE Piston Ring Set 4.005 1.5 1.5 3.0mm (Part Number 4005MS-15) is a file-fit piston ring kit engineered for eight-cylinder high-performance engines requiring precise bore sizing and optimized compression characteristics. This premium piston ring set features ductile iron construction with plasma moly coating, delivering superior wear resistance and extended service life in demanding engine environments. File-fit rings demand precise installation and cylinder preparation, making them the choice of serious engine builders and racing applications where tight clearance control directly translates to improved ring seal and combustion efficiency.
The 4.005-inch bore specification accommodates engines in this displacement range, while the ring thickness configuration—1.5mm top ring, 1.5mm second ring, and 3.0mm oil control ring—provides the compression balance and oil management essential for consistent performance across throttle ranges. Plasma moly plating enhances boundary lubrication at startup and under high load, reducing micro-welding and scuffing that can occur with standard iron rings. Standard tension characteristics ensure reliable sealing without excessive friction penalty. As a file-fit kit, these rings require careful honing of the cylinder bore to specification and precise gap fitting before installation—a process critical to achieving the sealing performance this ring design is engineered to deliver.
This piston ring set is built for engine builders, racing enthusiasts, and performance shops rebuilding eight-cylinder engines where OEM clearances have been opened up or custom bore sizes demand matched ring sets. MAHLE's reputation for precision manufacturing ensures concentricity and thickness tolerance that translates directly to leak-free sealing once properly installed. Verify your exact bore diameter, ring groove dimensions, and cylinder preparation specifications before ordering; file-fit rings are not forgiving of improper installation or cylinder condition.
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