Radium Engineering 20-0465 Secondary Fuel Rail for 90-95 Mazda Cosmo 20B-REW

Vehicle Fitment

• 1990-1995 Mazda/Eunos Cosmo (20B-REW 2.0L turbo rotary, RWD)

Features

• Secondary top-feed fuel rail designed for Mazda 20B-REW rotary engines
• Billet aluminum construction with anodized black finish for durability
• Large internal bore supports high-flow fueling, including E85 use
• Three 8AN ORB ports for regulators, pulse dampers, or sensors
• Additional center port for fuel temperature sensor or accessory plumbing
• 11 mm injector bores accommodate OEM injectors; 14 mm seats included for aftermarket injectors
• Insulating phenolic spacers reduce heat transfer from engine
• Uses Viton O-rings, suitable for boosted applications

Specifications

• Material: CNC-machined billet aluminum, anodized black
• Injector bore: 11 mm ID (OEM), includes 14 mm seats for Bosch EV14-style injectors
• Ports: 3 x 8AN ORB plus center accessory port
• Compatibility: Mazda 20B-REW rotary engine (Cosmo 1990-1995)
• Fuel types supported: Gasoline and E85

Included Components

• 1x Secondary top-feed fuel rail assembly
• 1x Set of phenolic insulating spacers and stainless hardware
• 1x Injector seat set (14 mm) with Viton O-rings

Product Description

The Radium Engineering 20-0465 Secondary Fuel Rail is engineered specifically for Mazda Cosmo models equipped with the 20B-REW turbocharged rotary engine between 1990 and 1995. This top-feed rail delivers superior fuel flow using a large internal bore and offers full compatibility with ethanol blends like E85.

Crafted from durable billet aluminum and finished in black anodize, the rail features three 8AN ORB ports and an additional sensor port for flexible system integration. It supports OEM injector compatibility using 11 mm injector bores, while included 14 mm injector seats and Viton O-rings allow use of high-flow aftermarket injectors securely.

Installation is straightforward with included mounting hardware and phenolic spacers to minimize thermal transfer. This rail is ideal for turbocharged 20B-REW rotary builds seeking consistent fuel delivery under boost, with full support for high-horsepower and performance applications.