PORTS AND FITTINGS

The fuel rail ports are tapped for 8AN ORB.

Appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.

NOTE: This is the full kit, if you need the individual pieces only, please follow the links directly below.

Radium Engineering Fuel Rail Kit – Honda K-Series

Radium Engineering Fuel Rail – Honda K-Series

Manufactured with a large 0.69″ internal bore, the fuel rail can support all necessary engine power requirements. They are CNC machined from extruded 6063 aluminum, media blasted, black anodized, and laser etched for a high-quality surface finish. Like the OEM fuel rails, the injector bores are 14mm ID so factory injectors are permitted. If purchased after July 2017, there is a provision to reuse the OEM injector clips (shown below).

This kit is compatible with all fuel types including popular alcohol mixtures such as E85. The OEM insulating spacers (Honda P/N: 16638-PNA-000) are reused and phenolic washers are included to thermally insulate the fuel rail from the aluminum intake manifold.

20-0230-PK Fuel Rail Plumbing, Honda K-Series
The plumbing kit contains the items in the image above.
Included:
-8AN ORB Plug (x2)
-8AN ORB Male to 5/16″ SAE Male Fitting

FUEL PULSE DAMPER
Do I need a pulse damper? The opening and closing of the injectors create pressure pulses in the fuel rail, which can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure, pulse damper(s) should be used (especially with high flow injectors). The internal diaphragm will absorb oscillation pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help an erratic surging idle.

If equipped, the OEM fuel pulse damper (shown above) can be reused with the Radium 14-0278 adapter fitting.

The Honda pulse damper and Radium pulse dampers (FPD-XR shown below) can be put on any of the fuel rail ports.

More information on the Radium Engineering dampers can be found HERE.