MAHLE 3021279B Performance Piston Ring Set Bore Steel Napier - 4.150 THM-13

The MAHLE 3021279B is a high-performance piston ring set engineered for precision engine builds requiring a 4.150-inch bore diameter. This bulk plain ring set features MAHLE's advanced THM-13 (Top High-Performance Material) steel construction with Napier ring design, delivering exceptional durability and sealing performance in demanding applications.

Key Specifications:

• Bore Size: 4.150 inches
• Top Ring Width: 1.5mm
• Ring Wall Thickness: 0.150" radial wall (RW)
• Material: Performance-grade steel with THM-13 coating
• Design: Napier ring configuration for improved oil control
• Style: Plain ring set (bulk packaging)

Performance Features:

• Steel construction provides superior strength and wear resistance compared to cast iron rings
• THM-13 coating reduces friction and extends ring life in high-performance engines
• Napier design optimizes oil distribution while maintaining compression sealing
• Precision-ground surfaces ensure consistent ring-to-cylinder wall contact
• Ideal for racing, high-output street engines, and performance rebuilds

MAHLE is a leading OEM supplier known for precision-engineered engine components. This ring set is designed for professional engine builders and performance enthusiasts who demand reliable, repeatable power from their builds.