Carrillo CPN-3632-4 CPN Piston Ring Set 4-Cylinder

The Carrillo CPN-3632-4 is a CPN-series piston ring set designed for 4-cylinder high-performance engine applications. CP-Carrillo's CPN ring sets are engineered to deliver maximum sealing with minimum friction drag, making them an ideal choice for sport compact and high-compression builds.

Ring Set Composition:

• Top Ring: Gas-nitrided steel compression ring — compatible with both Nikasil and cast iron bores; the nitriding process provides scuff resistance and extended service life under extreme conditions
• Second Ring: Cast iron Napier (taper underhook groove) face design — acts as a wiper to push oil away from the combustion chamber and allows the use of a lower-tension oil ring
• Oil Ring: 3-piece design consisting of two gas-nitrided rails and a low-tension miniflex vent expander — reduces cylinder wall friction while maintaining precise oil control

Key Features:

• High-strength, low-tension ring design for maximum sealing with minimal parasitic drag
• Gas-nitrided top ring compatible with Nikasil and cast iron cylinder bores
• 3-piece oil ring assembly with miniflex vent design for reduced friction and improved engine efficiency
• Engineered specifically for use with CP-Carrillo pistons — OEM rings will not fit CP pistons
• Recommended cylinder honing: plateau honing with 35–40 degree cross-hatch angle

CP-Carrillo CPN ring sets are manufactured to fit specific bore sizes. Ring end gaps must be verified and filed to specification prior to installation. Proper ring gap is critical — failure to check ring gap can result in severe engine failure. Always use a ring filing tool and file in an inward direction, square to the sides.