Radium Coolant Expansion Tank Lotus Elise Exige Oem Location
20-0270-01
Regular price £371.74 Sale price £266.90 Save £104.84Radium Engineering 20-0270-01 S2 Lotus Elise, Lotus Exige, and Lotus 2-Eleven comes standard with a Denso coolant expansion tank. This is the same plastic tank that is found in the Toyota 2ZZ-GE equipped vehicles. For fitment, Lotus designed a complex bracket that incorporates a mount for the electric hot-soak water pump. There has been cases reported where the Denso tank has failed and owners have found that new replacements are quite expensive. Radium has simplied the Lotus design by making two separate mounts and further improved it using a robust aluminum tank and adapting the factory hoses to -6AN fittings.
The mount uses all factory threaded mounted holes. Because of this, there is no need to drill or modify anything as it bolts in. Install is a fairly simple process that can be performed by an average mechanic. Everything is accessible with the rear clam intact. Aluminum push lok-hose ends are included to convert the factory coolant hoses into -6AN.
Includes:
-Billet Aluminum Coolant Tank Anodized Black
-Nickel Plated Sight Tube Fittings
-Aluminum 6AN Male Adapter Fittings Anodized Black
-Aluminum 6AN Hose Ends Anodized Black
-Laser Cut Aluminum Tank Bracket Powder Coated Black
-Laser Cut Aluminum Hot-Soak Water Pump Bracket Anodized
-Rubber Isolation Coolant Tank Grommets
-Hot-Soak Water Pump Cushion Clamp
-Mounting Hardware
Options:
The optional Radium Engineering pressure caps (sold separately) allow the user to select a range of pressure that was not possible with the Denso tank. 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
Note: The OEM Lotus pressure cap is 1.1Bar.
My main problem was that the original tank was plastic, expensive and prone to leakage.
So this was the best possible one to get.
Coolant level is in a stupid place.
The tank is a 2 piece and there is a gap between the vortex separator and the real tank, witch enables a non 100% separation and non 2 high compartments like original, taking the air from the system .
The wall between tanks should be made to enable an oring between compartments and the outside sealing also oring made and not paper gasket…
Tube fitting could be simpler and cheaper to get a more original look and fitment.
And last but not least…mine came beaten on a corner.
Overall only ok - Water level view pipe is on the wrong end and difficult to view. Also filler cap now under the supercharger intercooler pipes so not so easy to fill. For the money, I would have expected it to be right.
