Regis Manufacturing CPS3425 Piston Ring Set 87mm Bore

The CPS3425 is a high-performance piston ring set designed for 87mm (3.425 inch) bore engines. This single-cylinder ring set is engineered to provide maximum sealing power with minimum drag, making it ideal for small bore and sport compact engines that generate high cylinder pressures.

Ring Configuration:

• 1.0mm gas nitrided steel top compression ring - compatible with Nikasil and cast iron cylinder bores
• 1.2mm taper hook groove (THG) Napier-style second ring for improved oil control
• 2.8mm low-tension flex vent oil ring with two gas nitrided rails and low-tension expander

Key Features:

• High-strength, low-tension design for reduced friction and increased efficiency
• Gas nitrided construction for enhanced durability and wear resistance
• Compatible with modern cylinder materials including Nikasil coatings
• Mini-flex vent design reduces cylinder wall friction for improved performance
• 87mm bore size (3.425 inches)

This ring set is sold per cylinder and is compatible with various high-performance piston applications. The advanced engineering delivers reliable sealing, reduced blow-by, and optimized engine efficiency for motorsports and performance builds.