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Our Price: $239.95


Click here to download installation instructions (PDF)


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.

The Radium Engineering high flow secondary fuel rail is for the OEM lower intake manifold found on the Mazda 20B-REW rotary engine. 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.

Like the stock fuel rail, the rail features 11mm injector bores permitting the use of OEM fuel injectors (shown below).

When the provided 14mm lower injector seats and thermal insulating spacers are used, aftermarket Bosch EV14 style injectors can be used (shown below).

The injector seats were designed to be compatible with or without the OEM diffusers in place. They feature FKM O-rings making them suitable for boosted applications.


When the included insulating spacers and injector seats are NOT installed: 
OEM Mazda Top Feed Fuel Injectors

When the included insulating spacers and injector seats are installed:
Injector Dynamics ID1050-60-11-14
Injector Dynamics ID1300-60-11-14
Injector Dynamics ID1700-60-11-14
Injector Dynamics ID2000-60-11-14
Injector Dynamics ID2600-60-11-14

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