Radium Engineering Fuel Rail – Top Feed Conversion Mazda 20B-REW Primary

This high-flow primary fuel rail from Radium Engineering is specifically designed for the 20B-REW rotary engine found in the 1990–1995 Mazda/Eunos Cosmo. Engineered for performance, it supports all fuel types including ethanol blends like E85.

Vehicle Compatibility:

• 1990–1995 Mazda/Eunos Cosmo (20B-REW 3-Rotor Rotary Engine)

Overview:
CNC machined from billet aluminum and black anodized for corrosion resistance, this fuel rail features a large internal bore capable of supporting high-horsepower applications.

Three 8AN ORB ports offer versatile plumbing options. The center port allows for accessories such as:

• OEM fuel temperature sensor (using adapter 14-0421)

• Fuel pressure transducer

• Radium fuel pulse damper

• Fuel pressure gauge

Thermal insulating spacers and stainless steel hardware are included to prevent heat transfer into the fuel system. Also included are 14mm lower injector seats with FKM O-rings, compatible with or without the factory injector diffusers—ideal for both NA and boosted setups.

Fuel Injector Compatibility:
This fuel rail accepts top-feed fuel injectors with 14mm O-rings. Confirmed direct-fit injector models include:

• Injector Dynamics ID1050-XDS-34-14-14

• Injector Dynamics ID1300-XDS-34-14-14

• Injector Dynamics ID1700-XDS-34-14-14

• Injector Dynamics ID2600-XDS-34-14-14