MAHLE 3010242B PC479 Fire-Power Piston Ring Set 4.470" Bore .017" Dykes Top Ring

The MAHLE 3010242B is a high-performance piston ring set designed for serious racing and performance applications requiring a 4.470-inch bore diameter. This Fire-Power PC479 series ring set features a specialized .017-inch Dykes-style top compression ring engineered to deliver superior sealing performance under extreme combustion pressures.

Dykes Ring Technology:

The Dykes compression ring features a unique L-shaped cross-section design that utilizes combustion pressure for enhanced sealing. During the power stroke, cylinder pressure enters the increased gap between the ring land and the top face of the ring, forcing the L-shaped portion outward against the cylinder wall. This pressure-assisted sealing design provides superior ring seal during combustion while requiring significantly lower radial tension than conventional rings—typically only 4 pounds compared to 9-10 pounds for standard rings. This reduced tension minimizes friction losses and frees up horsepower, making Dykes rings a popular choice for drag racing, endurance racing, and high-RPM applications.

Key Features:

• .017-inch Dykes-style top compression ring with L-shaped profile
• 4.470-inch bore diameter for large-displacement performance engines
• PC479 Fire-Power series construction for racing applications
• Low-tension design reduces friction and parasitic power loss
• Pressure-assisted sealing maximizes combustion chamber integrity
• Ideal for high-output drag racing and endurance applications
• Plain ring set configuration

Application Notes:

This ring set is designed specifically for racing and high-performance engines where maximum sealing during the power stroke is critical. The Dykes ring design excels in high-RPM, high-compression, and boosted applications. Due to the low-tension design and pressure-assisted sealing characteristics, this ring set is recommended for competition use where rings are serviced regularly as part of routine maintenance. File-fit installation may be required for proper end gap specification.

MAHLE's Fire-Power PC479 series represents the pinnacle of performance ring technology, engineered to withstand the extreme temperatures, pressures, and speeds encountered in professional racing environments.