[Diy_efi] Fuel rail sizing

[Dave Dahlgren]

All the Supra race engines I have worked on had a 3/4 inch od rail about 0.035
wall thickness in stainless steel. If it going to be a batch fire system it is
about impossible to build one too big if sequential i have found the demands to
be a little more modest in the way of peak flow demands as you are only turning
on one injector at a time.
Dave Dahlgren

Grant Beaty wrote:
> 
> Does the diameter of a fuel rail need to be larger than that of the fuel
> line itself? (like a plenum on an intake manifold?) I've got my stock fuel
> rail in front of me, its a side-feed rail, and it has the same diameter as
> the 6 AN fittings welded onto each end. Its got 6 550cc injectors, which
> seem to be prefectly happy running %100 duty cycle all day long (although I
> will not likely run them that high), do I need a larger fuel rail? (Yes I
> have searched the archives before posting this)
> 
> Thanks for any help,
> Grant Beaty
> '97 Toyota Supra
> 
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