





Radium Engineering Secondary Fuel Rail for Mazda Cosmo JC 13B-RE
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Description
Radium Secondary Fuel Rail - Mazda Cosmo JC (13B-RE)
Application: Mazda / Eunos Cosmo JC 1990-1995 (13B-RE)
Part Type: Secondary fuel rail
Part Number: 20-0446
The Radium 13B-RE Secondary Fuel Rail is a high-flow replacement for the factory secondary rail on the Cosmo 13B-RE rotary. It is machined from aluminium, black anodised and compatible with popular fuel types including E85, with a large internal bore to support the engine's power requirements.
The rail has 11mm injector bores like the stock rail, so OEM injectors fit, and the fuel ports are tapped for 8AN ORB. An extra centre port can accept accessories such as the OEM fuel temperature sensor, a pressure transducer or a pulse damper. Included injector seat adapters allow tall aftermarket injectors to be used.
Key Features
- Large Internal Bore: Supports the power requirements of modified 13B-RE engines
- OEM Injector Compatible: 11mm injector bores like the stock rail
- Aftermarket Injector Option: Injector seat adapters suit 60mm aftermarket injectors
- 8AN ORB Ports: Fuel ports plus a centre accessory port
- Fuel Compatibility: Compatible with popular fuels including E85
- Finish: Black anodised aluminium
What's Included
- Black anodised aluminium secondary fuel rail
- Insulating spacers
- Injector seats and injector seat adapters
Optional Parts
- Radium 14-0421 8AN ORB to M12x1.5mm Female Fitting (14-0421) – fits the OEM fuel temperature sensor into the centre port
Important Notes
- Without the included spacers and injector seats installed, only OEM Mazda top-feed injectors can be used
- With the injector seat adapters, aftermarket injectors must be 60mm tall with an 11mm upper and 14mm lower O-ring (e.g. Injector Dynamics ID1050-XDS 1050.60.11.14 through ID2600-XDS 2600.60.11.14)
- Fittings must be selected for your application – allow clearance around the ports for regulators, gauges and pulse dampers
- Installation instructions are available in the Instructions tab
Vehicle Fitment
- Mazda / Eunos Cosmo JC (1990-1995) – 13B-RE
If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.
Installation
We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.
Note
Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.

