MAHLE 3020248 Plain Ring Set Bore Grey Iron RBT Second Ring - 4.165in 5/64

The MAHLE 3020248 is a plain piston ring set engineered for a 4.165-inch bore diameter, featuring a 5/64-inch (0.078in) edge width grey iron RBT (Reverse-twist, Taper-faced) second ring. This individual ring set is purpose-built for oval track claimer series and performance engine applications where reliable sealing, durability, and consistent oil control are essential.

The grey iron RBT second ring design uses a reverse-twist geometry that causes the ring to torsionally twist in the groove, preventing oil migration up and behind the second ring while the taper face scrapes oil from the cylinder wall. This configuration delivers proven oil control performance in competition and high-output street engines.

Key Features:

• Bore Diameter: 4.165 inches
• Second Ring Edge Width: 5/64 inch (0.078 in)
• Second Ring Type: RBT — Reverse-Twist, Taper-Faced
• Second Ring Material: Grey Cast Iron
• Ring Set Style: Plain (standard gap)
• Reverse-twist design prevents oil migration behind the second ring
• Taper face provides effective oil scraping on the cylinder wall downstroke
• Engineered for performance and claimer oval track engine builds
• Sourced from MAHLE, a globally recognized leader in piston ring design and manufacturing

MAHLE piston ring sets are developed using advanced simulation and computer modeling tools to minimize friction and maximize sealing performance. The 3020248 plain ring set is an ideal choice for builders seeking a reliable, race-proven grey iron second ring solution at a 4.165-inch bore size.