Radium Engineering

Radium Engineering RB25DET R33 Top Feed Fuel Rail

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PORTS AND FITINGS

The fuel rail ports are tapped for 8AN ORB.

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.


This fuel rail is for the Nissan RB25DET (non NEO) engine ONLY. This is commonly found in the R33 Skyline among others.


Manufactured with a large 0.69" internal bore, the fuel rail can support all necessary engine power requirements. The Radium fuel rail converts the OEM side feed fuel injector setup to top feed allowing the use of high flow 14mm O-ring fuel injectors (not included). This kit is compatible with E85.

The fuel rail has four 8AN ORB ports that can be used for fuel inlet, outlet or for plumbing option accessories. All unused ports must be plugged. 

The rail is extruded and CNC machined from solid 6063 aluminum and black anodized for a high quality surface finish.  

 


Included
-Black Anodized Aluminum Fuel Rail
-Phenolic Mounting Bolt Spacers, Short (x3)
-Phenolic Mounting Bolt Spacers, Tall (x3)
-Phenolic Mounting Bolt Washers (x3)
-Radium 20-0161-06, 25mm Injector Seats
-Stainless Steel Mounting Bolts, Short (x3)
-Stainless Steel Mounting Bolts, Tall (x3) 


 

Fuel Injector Compatibility
The kit includes 2 sets of phenolic spacers (shown above in the kit contents) to suit multiple height injectors. The spacers are machined from phenolic material and offer excellent resistance to heat transfer.

Use the tall spacers and longer mounting bolts to accomodate this size injector:

Below are some of the many fuel injectors that are a direct fitment with this Radium fuel rail kit using the tall spacers:

Injector Dynamics ID725-48-14-14
Injector Dynamics ID850-48-14-14
Injector Dynamics ID1000-48-14-14
Injector Dynamics ID1050x-48-14-14
Injector Dynamics ID1300-48-14-14
Injector Dynamics ID1700-48-14-14
Injector Dynamics ID2000-48-14-14 


Use the shorter spacers and mounting bolts to accomodate this size injector:

Below are some of the many fuel injectors that are a direct fitment with this Radium fuel rail kit using the short spacers:

Injector Dynamics ID850-34-14-14
Injector Dynamics ID1050x-34-14-14
Injector Dynamics ID1300-34-14-14
Injector Dynamics ID1700-34-14-14
Injector Dynamics ID2000-34-14-14 

NOTE: Fuel Injectors are NOT included and must be purchased elsewhere.