Radium 20-1120 Primary Top Feed Fuel Rail for 1990-1995 Mazda Cosmo 20B-REW

Vehicle Fitment

• 1990-1995 Eunos/Mazda Cosmo (20B-REW rotary engine)

Fitment Notes

• This is the primary injector location fuel rail only; a separate secondary rail is required for a complete 20B-REW fuel rail conversion
• Requires universal top-feed fuel injectors with a 34mm height and 14mm O-ring dimensions (e.g., Injector Dynamics 1050-XDS, 1300-XDS, 1700-XDS, or 2600-XDS in the 34.14.14 configuration) - injectors are not included and must be purchased separately
• Appropriate 8AN ORB fittings must be selected separately based on your specific accessory setup (regulator, gauge, pulse damper, etc.)

Features

• Converts the factory 20B-REW primary injector location to top-feed injectors
• CNC-machined billet aluminum construction, black anodized for durability and E85 compatibility
• Large internal bore supports high fuel flow for increased power applications
• Included anodized billet aluminum injector seats work with or without the OEM diffusers in place
• FKM O-rings on the injector seats make the rail suitable for boosted applications
• Thermal insulating spacers and washers with stainless steel hardware reduce heat transfer into the fuel
• Three 8AN ORB ports, including an extra center port for accessories like a fuel temperature sensor, pressure transducer, or fuel pulse damper

Specifications

• Material: Billet Aluminum, Black Anodized
• Port Configuration: 3x 8AN ORB
• Injector Seat Size: 14mm Lower, FKM O-Ring Sealed
• Required Injector Dimensions: 34mm Height, 14mm O-Ring
• Fuel Compatibility: All popular fuel types, including E85

Included Components

• 1x Anodized Billet Aluminum Fuel Rail
• Anodized Billet Aluminum Injector Seats
• Thermal Spacers
• Mounting Hardware

Product Description

The Radium 20-1120 is a high-flow primary fuel rail built for the 20B-REW rotary engine found in the 1990-1995 Eunos/Mazda Cosmo, converting the factory injector setup to a top-feed configuration. Machined from billet aluminum and black anodized for durability and full compatibility with E85 and other popular fuel types, the rail's large internal bore is sized to support serious power increases without becoming a fuel delivery bottleneck.

Included injector seats are anodized billet aluminum with FKM O-rings, engineered to work whether or not the OEM diffusers remain in place, and rated for boosted applications. Thermal insulating spacers and stainless steel hardware help keep engine heat from soaking into the fuel rail, protecting fuel temperature under sustained load. Three 8AN ORB ports give you room to plumb a fuel pressure regulator, gauge, or pulse damper, with the extra center port available for accessories like a fuel temperature sensor or pressure transducer.

This rail requires universal top-feed injectors with a 34mm body height and 14mm O-ring diameter - injectors are sold separately, and several Injector Dynamics part numbers are confirmed to fit. As the primary-location rail, it's designed to be installed alongside Radium's matching secondary rail for a full top-feed conversion on the 20B-REW.