KOYORAD Radiator

Koyorad Radiator started off in 1956 as a radiator repair shop known as Ejiri Radiator.  Twelve years later in 1968, they assembled a radiator and oil cooler.  Once this happened they separated their production facility from their repair facility and began manufacturing radiators.  Two years later, in 1970, Ejiri Radiator was renamed Koyo Radiator Manufacturing. 

Koyorad Radiator


With decades in the industry, their quality and precision is hard to beat. They use top grade materials such as aluminum, copper, brass and plastics.  Their products are designed to be resilient in harsh elements. More importantly, they are manufactured to withstand years of under-hood heat cycling.

Each radiator manufactured by KOYO is made to OE specifications. This means they do not require any drilling, cutting, or relocating. This allows for pain-free installation. However, it is highly recommended to have a professional install your new radiator.

Koyo developed detailed plastic tank molds which have critical features such as structural reinforcements, supports for coolant return lines, fan mounts, and coolant reservoirs.  Koyo is one of the few aftermarket manufacturers with the capability of reinforcing header plates for strength and durability like the OEs. Reinforced header plates provide increased surface area for support where higher than normal internal pressure exist. However, this feature is only available on select models. Lastly, Koyo die cuts each header plate with state-of the-art machinery.

Koyo has 12 international locations, each with a group of skilled engineers with over 54 years of experience. Koyo radiators are made in their privately owned ISO-9001 certified facilities. To assure a tight seal with the O-rings and plastic tanks they hand inspect every unit for accuracy and cleanliness.


When browsing through Koyorad’s catalog you will see they offer 4 types of radiators.  They have a wide range of copper/brass radiators, plastic tank/aluminum core radiators, all aluminum radiator (OE replacement), and an all-aluminum radiator designed for racing aspects.  Their all aluminum radiator designed for racing is lightweight. It also has a high performance radiator line. As stated earlier, no matter which system you decide on, they are all designed to drop in without any modifications.  Among those 4 types of radiators are several series. 


The R Series radiator features a 53mm core. If your a serious performance tuner this system is designed for you! Intended for both daily and circuit use, it features increased capacity which allows for better cooling reserve.    You double your coolant capacity and will see a 35% increase in performance vs. your factory radiator.


The V series features a 36mm core thickness.  Its designed for applications where engine configuration & size cause clearance issues for thicker core radiators.  Its intended for both circuit and daily use.


The Hyper V-Core series is the newest series to Koyorad.  Featuring a 36mm core thickness, it also has hyper fin and tube pinch.  This series is designed for vehicles that experience extreme heat. Its ideal for those who have limited engine space, and where the factory inlet/outlet locations eliminate the option for a proper N-FLO design.  The fin and tube pitch increase the surface area while still allowing for excellent air circulation through the radiator.  If you have limited space, and high performance is a must, then this a great option for you.

S Series Copper Core

This series incorporates the same technology as Koyo’s OE aftermarket replacement line.  It has moulded plastic tanks, but with a copper core in place of aluminum.  Copper offers excellent heat exchange. That makes it a great choice for a light tuned car and will not be at in use for extended lengths of time.  The S Series Copper Core is Nocolok brazed, and factory fit. Additionally, it retains mounts for the stock fan shrouds and fans. These are available for a limited amount of vehicles.

N-FLO Technology

When factory equipped radiators have inlet and outlet locations that allow proper placement, Koyorad carefully welds aluminum partitions in the upper and lower tanks of the radiator.  This is Koyo’s N-Flo technology that allows for a double or triple pass radiator.  This design cools more efficiently by allowing the coolant to remain in the radiator for longer periods of time. This allows more heat to be transferred to surrounding air.  This technology is great for vehicles that have limited airflow to the radiator.

When deciding which Koyo Radiator is good for you, it’s important to keep these key things in mind:

  • Engine Size & Compression ratio
  • Horsepower output & torque
  • Intended vehicle use
  • Type of fain (electric or flex)
  • Transmission type
  • Available space within the engine compartment

In conclusion, its highly suggested to speak to a professional when deciding on a Koyorad Radiator. This will help ensure you are getting the proper one for your vehicle. No matter what series you decide to go with, your vehicle will thank you for it.