The Radium Coolant Expansion Tank features three ports that use -6AN to 9/16-18 O-ring adapters (not tapered pipe threads) for a positive seal. The main tank is a 2-piece design constructed of cast aluminium. The two halves (shown below) are welded together along with a CNC billet aluminium radiator neck which accepts standard 32mm "Mini" style pressure cap.



The coolant expansion tank features two internal chambers. These chambers are NOT isolated from each other. There is cross-over passages at the top and bottom. This product is not a coolant overflow tank. Instead, it is designed to part of the pressurized coolant system.

Download the installation instructions for more information on plumbing and setup of the Radium coolant expansion tank.

Coolant expansion tanks are necessary for proper air bleeding in applications that utilize a low mounted radiator, such as a V-Mount or a Rear-Mount radiators. Shown below is the coolant tank used on Michael Essa's 2014 professional drift E46 BMW.



The Radium Engineering coolant header tank also has an internal swirl feature, as shown below. Hot pressurized coolant from the cylinder head is sent into the vortex chamber's inlet tangentially and accelerated to a high rate of rotation. This is to help aid in deaerating the system.



Included are three -6AN female 90 degree hose ends that screw onto the three -6AN male coolant tank port fittings. They are lightweight black anodized aluminum and are used for push-lok style 3/8" ID hose.



All coolant tanks are pressure tested in house (shown below) and then powder coated texture black and laser etched.



Includes:
-Cast Aluminum Coolant Tank
-Powdercoated Aluminum Mounting Bracket
-6AN O-Ring Adapter Fittings (x3)
-6AN 90 degree Push-Lok Hose Ends (x3)
-Nickel Plated Fittings and Sight Tube
-Billet Aluminum 32mm Pressure Cap Receiver
-Billet Aluminum Pressure Bleed 1/4" Nipple

Mounting:
A laser cut black powercoated laser cut mounting bracket is included.



See the dimension drawing below.



Pressure Caps
The optional Radium Engineering pressure caps (sold separately) allow the user to select a range of pressure. The purpose of a high pressure cap is to increase the boiling point in the cooling system providing improved cooling efficiency. Each cap is manufactured from stainless steel with a race proven high pressure valve. This is something to consider when tracking the vehicle in extreme conditions. For more information, go HERE.

Radium Pressure Cap - 1.1 Bar (110 kPA, 15.6 psi)
Radium Pressure Cap - 1.3 Bar (130 kPA, 18.9 psi)
Radium Pressure Cap - 1.5 Bar (150 kPA, 21.8 psi)



Stock images used. Actual product may vary.