Radium Engineering Top Feed Fuel Rail Conversion 13B Primary

£129.95 (inc VAT)

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The Radium Engineering high flow primary fuel rail is for the 13B-RE and 13B-REW rotary engine found in the 1990-1995 Mazda/Eunos Cosmo and 1992-2002 Mazda RX7 FD3S. The aluminum fuel rail is anodized black for compatibility with all popular fuel types including E85. Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements.

The three 8AN ORB ports are compatible with these fittings HERE. The extra center port allows additional fuel system accessories such as the OEM fuel temperature sensor (using Radium Part RA-14-0421), a pressure transducer, Radium fuel pulse damper (shown below) etc.

Insulating phenolic spacers and washers are included with stainless steel hardware to prevent thermal energy from conducting heat into the fuel.

The included 14mm lower injector seats (shown above) were designed specifically to be compatible with or without the OEM diffusers in place. They feature Viton O-rings making them suitable for boosted applications.


Below is the spec of the fuel injectors that are compatible with this rail. Essex Rotary Recommend Injector Dynamics fuel injectors for their superior fuel delivery, atomization, build quality and performance

34mm length bodies along with 14mm top and bottom o-rings are required.

Most of the current line of Injector Dynamics fuel injectors will brake down to this size once you remove the top caps however we are able to order these 34mm bodied injectors in for customers on a special order basis. These are available in the following sizes

  • ID1050XDS
  • ID1300XDS
  • ID1700XDS
  • ID2600XDS

Please note that fuel injectors are not included with the purchase of this fuel rail.


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