MAHLE 3021372B Performance Piston Ring Set Bore Steel Napier Ring - 3.932 1.0mm 2nd

The MAHLE 3021372B is a high-performance piston ring set engineered for precision engine builds requiring a 3.932-inch bore diameter. This ring set features a steel Napier-style second ring design, optimized for superior oil control and combustion sealing in demanding applications.

Key Specifications:

• Bore diameter: 3.932 inches
• Ring width: 1.0mm for the performance second ring
• Radial wall thickness: .136 inches
• Steel Napier design on second ring for enhanced oil control
• Plain ring configuration

MAHLE piston rings are manufactured to OEM specifications and beyond, utilizing advanced materials and coatings to ensure optimal sealing, reduced friction, and extended engine life. The steel Napier second ring design provides aggressive oil control while maintaining excellent conformability to cylinder walls, making this set ideal for performance and racing applications where precise ring-to-bore clearances are critical.

This ring set is designed for professional engine builders and enthusiasts who demand precision-engineered components for high-performance engine assemblies.