Dual fuel PFI rails....

[Bruce Plecan]

On several cars, I've tinkered with the was a noticeable inprovement going
from 3/8" to 1/2".   I can even imagine going smaller.   The instantaneous
demand when all the injectors opem is huge.   Maybe given enough pressure it
would work, but that would be the only "good" thing about it".
   Stock is like 30 lbs/hr.  so 180 pounds per hour.  figure 30 gals.  1/2
gal per min. at 80% duty cycle.  100 "beats" per sec., feeding 6 injectors.
   I'd like alot of reserve capacity for that.  Just about totally opposite
of a carb where the needle and seat is almost always "flowing" at WOT.
Grumpy



| Was just thinking a dual fuel setup, via various methods.  Dual injectors
| would be ideal, but would be a lot of work which I'm not equipped to do
| (maybe now's the time to learn....).  Proposed vehicle is 4.3l Syclone.
| What would be the expected result of having a small-bore fuel rail for
port
| injectors, maybe 1/4" I.D. or so?  Idea being, that a switch in input
fuels
| would reach the last injector in the line as fast as possible.  Would the
| flow rate be adequate for correct injector operation?  Another thought I
| had was a dual rail feeding a common injector(s); if designed properly,
| would be minimal residual fuel for the higher-octane stuff to flush out
| when hi octane circuit was activated.
| I'm sure there's been some discussion of this topic; the advantages of
| running on lower than optimal octane fuel when higher octane is not needed
| (i.e., no boost) is just too attractive.
| What do you folks think?  Many thanks for any feedback.
| Sincerely, Barry