Radium Engineering 20-0446 Secondary Fuel Rail Kit for 1990-1995 Mazda 13B-RE

Vehicle Fitment

• 1990-1995 Mazda/Eunos Cosmo (13B-RE 1.3L rotary, RWD)
• 1993-1995 Mazda RX-7 (13B-RE 1.3L rotary, RWD)

Features

• High-flow secondary top-feed fuel rail for Mazda 13B-RE rotary engines
• Billet aluminum construction with black hard anodized finish
• Three 8AN ORB ports for regulators, sensors, or fuel pulse dampers
• Extra center port for temperature sensors or accessory plumbing
• Insulating phenolic spacers and washers to minimize heat transfer
• Designed to accommodate OEM or aftermarket fuel injectors with 11 mm bores
• Viton O-rings for boosted and high-flow applications
• CNC-machined internal bore supports elevated power demands

Specifications

• Material: Billet aluminum, hard anodized black
• Injector bore: 11 mm ID, compatible with OEM Mazda injectors
• Ports: 3x 8AN ORB and one extra center port for sensors or accessories
• Includes phenolic spacers to insulate from engine heat
• Fitment: Mazda 13B-RE rotary engines (Cosmo, RX-7) 1990-1995
• Fuel types supported: Gasoline and E85 compatible

Included Components

• 1x Secondary top-feed fuel rail assembly
• Phenolic insulating spacers and stainless hardware
• 14 mm injector seat set with Viton O-rings

Product Description

The Radium Engineering 20-0446 Secondary Top-Feed Fuel Rail Kit is engineered specifically for Mazda rotary engines using the 13B-RE platform - as found in Mazda/Eunos Cosmo (1990-1995) and Mazda RX-7 models (1993-1995). Constructed from high-quality anodized billet aluminum, this fuel rail supports elevated fuel flow while minimizing thermal influence using phenolic spacers and Viton-sealed injector seats.

Featuring three 8AN ORB ports and an additional center port, the 20-0446 allows integration of fuel pressure regulators, sensors, or dampers without modifying the stock system. Compatible with OEM Mazda injectors, the design provides bolt-on installation for boosted or naturally aspirated rotary setups.

With support for fuel types including gasoline and ethanol blends (E85), this high-flow rail is ideal for tuning enthusiasts aiming for smoother fuel delivery, consistency under boost, and improved performance in rotary engine builds.