Fuel Rail size?
Turbo Mini Forums

whats commonly used?

im thinking of using some square alu tube approx 15mm and enough to span the inlet ports
thinking ill turn some round ends to tig on that have something resembling a push lock barbed hose end for some 8mm efi hose with a clamp for safety also turn a pair of 14mm injector bosses to tig on

assuming there will be minimal heat input to the fuel that will directly affect injected fuel temp and there fore volume as its being returned to the tank but perhaps this may over a bit of time heat the whole fuel tank up?

that sounds fine plenty in fact, generally rails are in the order of 10-13mm bore, and fuel hoses normally about 8mm. I tend to use AN8 fittings, the K1100 rail for exaple is 10mm square tube iirc.

I would consider doing the rail in stainless as it will probably be easier to tig than ally, or you can get a production rail and mod it, you can often sewat off the injector fittings and braze/silver solder then onto a fresh rail

in terms of heat Turbo dave did a check years ago and the fuel does not seem to warm up, i think he found a few degrees after about an hours running. of course it wouldnt hurt to put a small cooler somwhere.

Google "fuel rail extrusion" (there might be different spellings so you might have to use Google UK).

It's aluminium section, various shapes and sizes but basically rectangular, rounded on one edge with a hole all the way through but over to the rounded edge and the big thick bit remaining can be drilled to take the injector inlets directly, no need for bosses.

I wouldn't say it's commonly used but it is the easiest....

(I used round tube and machined up adapters).

Schrödinger's cat - so which one am I ???

A 1/2" ID rail would easily support 1000hp

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

well this is what ive come up with i had the alu so worth a shot i think

probably should have given it more prep before welding but i guess it will do as long as there's no pin holes..

I seen a guy in South Africa make fuel rails from some 15mm copper plumbing tubing once.
Not visually spectacular...but innovative and cheap. And the 15mm OD left the ID almost perfect for most 14mm o-ring injectors !

And for the DIY could easily be soldered together

That rail looks perfectly fine though

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

And on the 7th day........... God created turbochargers!

i actual soldered some copper A/C pipe to the steel dip stick tube to relocate it because of how i put the IC but ill show that in the build thread

i solder copper wiring nearly every day but never thought to do tube haha o well