Radium Coolant Expansion Swirl Tank - Lotus Elise / Exige 2006-2011 (2ZZ-GE)
Radium Coolant Expansion Swirl Tank - Lotus Elise / Exige 2006-2011 (2ZZ-GE)
Universal fit
No vehicle selection needed.
This part may still fit. Check the details below or contact us before ordering. Ask about fitment
Fitment not confirmed
This part may still fit. Check the details below or contact us before ordering. Ask about fitment
In Melbourne? Fit it in our workshop.
We fit parts in-house at the RevZone workshop. Book a time and bring your car in.
Description
Radium Coolant Expansion Swirl Tank - Lotus Elise / Exige (2006-2011, 2ZZ-GE)
Suits:
- 2006-2011 Lotus Elise — 2ZZ-GE
- 2006-2011 Lotus Exige — 2ZZ-GE
The Radium Engineering Coolant Expansion Swirl Tank is a remote-mounted header tank designed for custom Lotus applications including engine swaps and turbocharger kits where the OEM expansion tank is no longer in an ideal location. Essential for applications using a low-mounted radiator such as a V-mount, where proper air bleeding requires a correctly positioned header tank.
Construction
Two-piece design CNC-machined from 6061 billet aluminium. The two halves are bolted together along with a CNC billet aluminium cap receiver that mates to any standard 32mm Type-A style pressure cap.
Internal Swirl / Vortex Deaeration
Hot pressurised coolant from the cylinder head enters the vortex chamber tangentially and is accelerated to a high rate of rotation. This proven technique aids in deaerating the coolant system — removing entrained air bubbles that can cause hot spots and reduce cooling efficiency.
Ports
- Lower ports (x2): 10AN ORB threads with 6AN male adapter fittings
- Side port (x1): 6AN ORB threads with 6AN male adapter fitting
- All fittings use AN ORB (not tapered pipe threads) for a positive, leak-free seal
Part Number:
- 20-0270-02 — Radium Coolant Expansion Swirl Tank (Lotus Elise / Exige 2006-2011, 2ZZ-GE)
Why Radium Engineering?
- ✅ Manufactured in the USA to motorsport-grade tolerances
- ✅ CNC-machined billet aluminium components built for performance and longevity
- ✅ Trusted by high-power build tuners and race teams worldwide
- ✅ Bolt-on fitment — no cutting, drilling, or fabrication required
- ✅ Internal vortex deaeration — proven hot rod technique for superior coolant system performance
Specifications
- Part Number
- 20-0270-02
- Brand
- Radium Engineering
Shipping
Orders are processed within 1-2 business days (Monday to Friday), and orders placed before 12pm AEST are usually dispatched the same day. Once dispatched, standard shipping takes 3-7 business days and express 1-3, with tracking emailed as your order leaves.
If part of your order is out of stock, we'll contact you with the option to split the shipment or hold it until everything is ready. Read the full shipping policy.
Returns
You have 14 days from delivery to request a return on unused parts in their original packaging. Refunds incur a 15% restocking fee (20% for special orders), or choose store credit and the full purchase value is applied to your account.
Parts that have been test fitted, installed, or used can't be returned, and special-order or overseas-ordered items are assessed case by case. Faulty or incorrectly supplied items are always covered at no cost to you. Read the full returns policy.