COMPATIBILITY

• 1990-1995 Mazda/Eunos Cosmo

OVERVIEW

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 extra center port allows additional fuel system accessories such as the OEM fuel temperature sensor, a pressure transducer, Radium fuel pulse damper, etc.

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.

PORTS AND FITTINGS

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.

FUEL INJECTOR COMPATIBILITY

When the included spacers are not installed, only OEM Mazda fuel injectors are compatible. 

By installing the included injector seat adapters, aftermarket fuel injectors can be used. The aftermarket injectors used in this scenario must be the tall 60mm height with an 11mm upper o-ring and a 14mm lower o-ring. While there are many brands that will carry equivalent injectors that can be used, the following part numbers are examples of compatible injectors:

• 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