MAHLE 3021251 Performance Piston Ring Set Steel Napier Bore - THM-13 4.130

The MAHLE 3021251 is a high-performance piston ring set engineered for precision engine builds requiring a 4.130-inch bore diameter. This professional-grade ring set features advanced steel construction with Napier THM-13 technology, designed to deliver superior sealing, reduced friction, and enhanced durability in demanding applications.

Key Specifications:

• Bore Size: 4.130 inches
• Top Ring Width: .043 inches
• Second Ring Width: .135 inches
• Configuration: RW (Reverse Twist) Plain Ring Design
• Material: Performance Steel Construction
• Technology: Napier THM-13 Profile

MAHLE performance ring sets are manufactured to exacting tolerances and incorporate advanced metallurgy to withstand high cylinder pressures and temperatures. The Napier profile second ring design optimizes oil control while the thin top ring reduces friction for improved horsepower output. Ideal for racing engines, performance rebuilds, and high-output street applications where reliability and power are critical.