Radium Engineering Coolant Tank Kit
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Radium Engineering Coolant Tank Kit - Honda Civic Type R (FK8 / FL5)
Plastic coolant tanks are known to fail after repeated heat cycling, and this Radium Engineering kit replaces the factory tank on the Honda Civic Type R FK8 and FL5 with a 2-piece CNC-machined billet aluminium unit, anodised black for longevity (SKU 20-0827). Aluminium also transfers heat better than plastic and is tough enough for racing use.
Video
Installing Radium Expansion Tank Civic Type R FK8
Internal volume matches the OEM tank so system capacity is unchanged. Two internal chambers with cross-over passages top and bottom, plus an internal swirl feature, help de-aerate the cooling system.
Note: Direct replacement with no permanent modifications: a dedicated bracket bolts to existing threaded holes and Radium adapter fittings connect to the factory coolant lines. The OEM Honda 1.3 bar cap can be reused, or upgraded to a Radium Type-A cap (sold separately). Installation by a professional is recommended.
Features
- CNC-machined 2-piece billet aluminium, black anodised
- OEM-equivalent internal volume
- Dual-chamber design with top and bottom cross-over passages
- Internal swirl feature for de-aeration
- Mounts to factory threaded holes with dedicated bracket
- Adapter fittings connect to OEM coolant lines
- Accepts the OEM 1.3 bar cap or Radium Type-A caps
Pairs Well With
- Radium Engineering Fluid Lock Dual Catch Can Kit - Honda Civic Type R (FK8 / FL5)
- Radium Engineering Port Injection Kit - Honda Civic Type R (FK8 / FL5)
- Radium Engineering Fuel Filter Mount - Honda Civic (FC/FK7) / Civic Type R (FK8/FL5)
Need help confirming fitment? Contact our team at sales@chicaneaustralia.com.au.
Vehicle Compatibility
| Make | Model | Chassis | Years | Engine / Notes |
|---|---|---|---|---|
| Honda | Civic Type R | FK8 | 2017-2021 | K20C1 |
| Honda | Civic Type R | FL5 | 2023+ | K20C1 |
Product
- Brand
- Radium Engineering
- Finish
- Black anodised
- Part number(s)
- 20-0827
Details
- Construction
- CNC-machined 2-piece billet aluminium
- Capacity
- Equivalent to OEM tank
- Internal design
- Dual chamber with swirl de-aeration
- Cap
- OEM Honda 1.3 bar or Radium Type-A (sold separately)
Contents
Billet aluminum coolant tank
Aluminum mounting bracket
Adapter fittings
5/16" heater hose & 7/32" overflow hose
Stainless steel hardware

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