Radium Engineering 06-11 Elise/Exige 2ZZ-GE ONLY Coolant Expansion Tank- Remote Location

• Lotus Elise
• Lotus Exige

The Radium remote mounted coolant header tank is commonly required for custom Lotus applications such as engine swaps, turbocharger kits, etc. where the OEM expansion tank is no longer in an ideal location.

NOTE: For the Radium Coolant Expansion Tank Kit that fits in the OEM location go HERE.

The main tank is a 2-piece design constructed of CNC 6061 billet aluminum, as shown below. The two halves are bolted together along with a CNC billet aluminum cap receiver which mates to any standard 32mm 'Type-A' style pressure cap .Coolant header tanks are necessary for applications that utilize a low mounted radiator, such as a V-Mount, for proper air bleeding. The Radium Engineering 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 an old hot rod trick to help aid in de-aerating the system.

PRESSURE CAPS

The optional Radium 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.

The OEM Lotus pressure cap is 1.1 Bar.