COMPATIBILITY

HONDA H22A1
HONDA H22A4
HONDA H23A1
HONDA F20A
HONDA F20B
HONDA F22A1
HONDA F22A4
HONDA F22A6

Fitment onto aftermarket intake manifolds is not tested and cannot be verified. Rails do follow OEM mounting and positioning, so consult the manifold manufacturer to find out if their manifold also follows OEM mounting and positioning.

FUEL INJECTORS

There are two type of fuel rails made by Radium: upgrade rails and top feed conversion rails. Upgrade rails only upgrade the rail and the OEM fuel injectors can be reused. If an upgrade to the injectors is desired, they must be equivalent to the OEM injector, meaning they must be the same height and the upper & lower O-rings must match the OEM diameters and styles. Top feed conversion rails are used to convert a vehicle that has side feed (or sometimes air-assist) injectors over to a top feed injector.

This fuel rail is an upgrade rail. OEM or OEM equivalent injectors must be used.

Radium does not make fuel injector recommendations.

Consult your tuner for injector brand or flow rate recommendations.
Consult the injector manufacturer for a part number that has the correct dimensions.

OVERVIEW

20-0870 Fuel Rail Honda F-H-Series

Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. They are CNC machined from 6061 aluminum, anodized, and laser etched for a high quality surface finish. Like the OEM fuel rails, the injector bores are 11mm ID so factory injectors, or any equivalent aftermarket injector, can be used.

This fuel rail has 4 ports that are tapped with 8AN ORB threads to accept 8AN ORB male fittings.

8AN ORB Adapter Fittings can be found HERE.
8AN ORB Direct Mount Regulators can be found HERE.
8AN ORB Fuel Pulse Dampers can be found HERE.
Fuel Pressure Gauge Adapters can be found HERE.

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.

20-1270-PK Fuel Rail Plumbing Honda F-H-Series

The plumbing kit includes the items shown in the image below and allows easy hookup to the factory feed line. It is intended to be used with the factory pressure regulator, but can also work with an aftermarket regulator.