MAHLE 3021371B Performance Piston Ring Set Bore Steel Napier - 3.922 1.0mm

The MAHLE 3021371B is a high-performance piston ring set engineered for precision engine building and racing applications. This premium ring set features a steel Napier-style second ring design, optimized for superior oil control and cylinder sealing in demanding performance environments.

Key Specifications:

• Bore size: 3.922 inches (99.6mm)
• Ring thickness: 1.0mm
• Radial wall thickness: 0.136 inches
• Steel Napier design second ring for enhanced oil control
• Plain ring configuration
• Performance-grade construction for racing and high-output engines

MAHLE piston rings are manufactured to exacting tolerances using advanced materials and coatings. The steel Napier second ring design provides excellent oil management while maintaining optimal ring seal under high cylinder pressures and temperatures. This ring set is designed for professional engine builders who demand consistent quality and performance in competition and high-performance street applications.