Radium Fuel Rail, Top Feed Conversion, Mazda 13B-REW Secondary

Radium Fuel Rail, Top Feed Conversion, Mazda 13B-REW Secondary


The fuel rail ports are tapped for 8AN ORB.

8AN ORB Adapter Fittings can be found HERE.
8AN ORB Direct Mount Regulators can be found HERE.
8AN ORB Fuel Pulse Dampers can be found HERE.
Fuel Pressure Gauge Adapters can be found HERE.

Appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.

This Radium Engineering secondary fuel rail is for the Mazda 13B-REW rotary engine.

With the use of the provided 2AN ORB plugs, this adaptable design permits both the OEM 2-port intake manifold (shown above) and aftermarket 4-port intake manifolds.

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 14-0421 shown below), a pressure transducer, Radium fuel pulse damper, etc.

Insulating phenolic spacers and washers are included with stainless steel hardware to prevent thermal energy from conducting heat into the fuel. The two M8 extension mounts are made from stainless steel for superior strength and corrosion resistance.

For the OEM 2-port intake manifold, the included 20mm phenolic spacers, billet injector seats, and 2AN ORB plugs will be used. Also, for the required space, an air control valve delete for the OEM 13B-REW intake manifold (sold separately) is required. See Radium 20-0449 HERE

The included 14mm lower injector seats 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. 

With this fuel rail, all lower intake manifolds variations are compatible with the fuel injectors listed below. For the Xcessive Manufacturing 4-port intake manifold, the included 11mm phenolic spacers will be used.


Below are some of the many fuel injectors that are a direct fitment with this fuel rail:

Injector Dynamics ID850-60-14-14
Injector Dynamics ID1050x-60-14-14
Injector Dynamics ID1300-60-14-14
Injector Dynamics ID1700-60-14-14
Injector Dynamics ID2000-60-14-14 
Evolved Injection DPI550-60-14-14
Evolved Injection DPI650-60-14-14
Evolved Injection DPI850-60-14-14
Evolved Injection DPI1000-60-14-14
Evolved Injection DPI1200-60-14-14
Evolved Injection DPI1300-60-14-14
Evolved Injection DPI2200-60-14-14

NOTE: Fuel Injectors are NOT included