Carrillo CPN-3622 CPN Piston Ring Set 3.622" Bore Performance Engine Rings

The Carrillo CPN-3622 is a high-performance CPN-series piston ring set designed for a 3.622-inch (92.0mm) bore. Engineered by CP-Carrillo for sport compact, domestic performance, and powersports applications, the CPN ring package delivers exceptional combustion sealing, reduced blow-by, and reliable oil control under demanding conditions.

The CPN ring set features a 1.0mm gas-nitrided steel top ring, a 1.2mm Napier-style second ring, and a 2.8mm flex-vent oil control ring. The gas-nitrided top ring is compatible with both Nikasil and cast iron bores, offering excellent scuff resistance and extended service life under extreme cylinder pressures. The Napier (hooked-face) second ring improves oil scraping performance over conventional taper-faced rings, while the lightweight flex-vent oil ring provides precise oil control with minimal drag.

Key Features:

• Bore size: 3.622" (approximately 92.0mm)
• Ring pack: 1.0mm gas-nitrided steel top ring / 1.2mm Napier second ring / 2.8mm flex-vent oil ring
• Gas-nitrided top ring compatible with Nikasil and cast iron cylinder bores
• Napier-cut second ring for superior oil scraping vs. conventional taper-face rings
• Flex-vent 3-piece oil ring for precise oil control with reduced friction
• Designed for high-compression, turbocharged, nitrous, and naturally aspirated builds
• File-fit capability for custom end gap tuning by the engine builder
• Compatible with CP-Carrillo pistons and other major forged piston brands

For cylinder honing, CP-Carrillo recommends plateau honing with a 35–40 degree crosshatch angle when using CPN rings. Ring end gaps should be verified and set by the engine builder prior to installation using a feeler gauge. Ring sets are manufactured to fit the specified bore; for every 0.001" over the intended bore, ring gap increases by approximately 0.00314".