Description
The Radium Engineering Fuel Rail for Mazda 13B-RE Secondary is engineered as a purpose-built solution for enthusiasts who want the surrounding system to be easier to package, service and trust under hard use.
Why This Upgrade Matters
Fuel rails become a packaging and flow foundation once an engine moves beyond the limitations of the original fuel system. The goal is not simply a larger rail: the rail must provide the injector interface, port layout and plumbing flexibility needed to build a serviceable, stable fuel system around the engine.
Product-Specific Details
The Radium Engineering high flow secondary fuel rail is for the 13B-RE rotary engine originally found in the 1990-1995 Mazda/Eunos Cosmo. 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. Like the stock fuel rail, the rail features 11mm injector bores permitting the use of OEM fuel injectors.
Fitment & Application
Application: Mazda 13B-RE Secondary
Fitment style: Application-Specific
Technical Notes
Radium performance rails commonly use anodized aluminum construction and ORB-style end ports to support configurable AN plumbing. Injector dimensions and sealing style remain application-dependent, so injector selection should be confirmed with the injector manufacturer or tuner.
Radium Part Number
RAD20-0446
Enthusiast Notes
For higher-power or track-focused builds, the real advantage is the freedom to design the rail, regulator, sensor and plumbing layout around the engine instead of being locked into the factory fuel hardware.
Before Ordering
Confirm engine/application, injector dimensions, required adapters, regulator strategy and whether a separate plumbing kit is needed. Fuel injectors and AN adapter fittings are not assumed to be included unless specifically listed for the selected SKU.