MAHLE 3150073-005 Fire-Power Piston Ring Set Bore File Fit - PC479 4.130 005

The MAHLE 3150073-005 is a PC479 Fire-Power™ precision-ground performance piston ring set designed for high-output racing and performance engine builds. Engineered to handle the extreme demands of nitrous oxide, turbocharged, and supercharged applications, this ring set delivers superior combustion sealing, stable radial tension, and reliable oil control across the full RPM range.

This set fits a 4.130" bore (+.005" oversize) and uses a file-fit design for precise end-gap tuning by the engine builder. Ring widths are 1/16" (top), 1/16" (second), and 3/16" (oil), in a standard tension configuration with ductile iron compression rings.

Key Features:

• PC479 Fire-Power™ ductile iron compression rings — engineered for high combustion pressures and extreme operating temperatures
• Barrel-faced top ring — promotes fast, consistent ring break-in and maintains cylinder wall contact as the piston rocks at TDC and BDC
• Napier THG (taper hook groove) second ring — acts as a check valve to relieve inter-ring pressure, scrapes oil from cylinder walls, and provides a reservoir on each downstroke for superior oil control
• CP-20™ oil control ring — features an exclusive 20-degree ear angle for maximum cylinder wall conformability and sealing
• File-fit design — allows the builder to custom-set ring end gap for the specific application
• Standard tension — optimized for performance street and competition use
• Sold as a complete engine set

Ring Dimensions: 1/16" top | 1/16" second | 3/16" oil  |  Bore: 4.130" (+.005")  |  Tension: Standard  |  Material: Ductile Iron

MAHLE is the world's largest piston ring manufacturer, supplying OE and performance applications with more than a century of engineering expertise. The PC479 Fire-Power series represents their commitment to delivering measurable power gains and extended engine life in the most demanding race conditions.