Radium Secondary Fuel Rail | Mazda 20B-REW (20-0465)

The 20B's secondaries carry the boost-era fuel load, and this rail carries the secondaries.

The Radium Engineering Secondary Fuel Rail for the Mazda 20B-REW is the high flow companion to the primary conversion rail on the 1990-1995 Mazda/Eunos Cosmo's three-rotor: aluminum construction anodized black for compatibility with all popular fuel types including E85, a large internal bore supporting all necessary engine power requirements, and 8AN ORB porting for serious plumbing. Injectors sold separately.

What You'll Feel

• Secondary injector supply that holds through the load range where rotaries drink hardest
• Delivery capacity matched to single-turbo and bridge-port ambitions
• E85 confidence from the anodized aluminum construction
• Modern serviceable plumbing replacing the Cosmo's aging factory rail

Features

• High flow secondary rail for the Mazda 20B-REW (1990-1995 Cosmo)
• CNC machined aluminum, anodized black; large internal bore; 8AN ORB ports
• All popular fuel types including E85; injectors not included

The Details

Rotary fueling is staged by design, with primaries handling idle and low load while secondaries stage in as demand climbs, and on a boosted three-rotor the secondary circuit is where the real volume moves, making its rail's bore and porting the ones that matter at full song. The rail pairs with the 20-0464 primary conversion to complete the engine, with the combo commonly plumbed through 8AN ORB adapter fittings and an FPD-R damper in the feed. Injector compatibility follows Radium's documentation, O-rings lubricated at install, and the first-start leak check runs before the first boost.

Kit Includes

• 1x Anodized high flow secondary rail with mounting hardware
• Injectors and plumbing fittings NOT included

Applications

• Mazda 20B-REW three-rotor (1990-1995 Mazda/Eunos Cosmo, swaps)
• Pairs with the 20-0464 primary conversion rail