KOYO RX7 N-Flow Aluminium Radiator - Suits Mazda RX7  FD Series 6/7/8 '92-02

Rotary Engines Don’t Forgive Overheating

The 13B-REW runs hotter and less forgivingly than a piston engine, and a factory plastic-tank radiator on a car this age was never built for spirited driving decades on. Push it hard on a warm day and rising coolant temps show up fast, followed by fading power and, eventually, apex seal damage.

A Cooling System Built for Real Punishment

Koyo's 53mm N-Flo core is engineered with optimised fin density and tube design to move more heat out of the system, backed by a full-aluminium, TIG-welded build that shrugs off the vibration and heat-cycling that kills OEM plastic tanks over time. Every unit is pressure-tested before it leaves the factory.

Key Features

• All-aluminium construction with TIG-welded tanks for maximum durability
• 53mm core for increased cooling capacity over the factory unit
• Optimised fin density and tube design for efficient heat transfer
• Direct-fit design | uses factory mounting points and fan shroud, no modifications required
• Compatible with standard radiator caps and coolant hoses (unless otherwise specified)
• Pressure-tested for reliability under sustained high load and temperature
• Ideal foundation for further performance upgrades, including higher boost levels