Take 50 pounds per cubic foot or .34 psi per foot.
Then two psi /.34 is  5.88 feet head.

I am using a pressure regulator so all that is academic.

BTW here is the latest 3D. I used a solid 1 inch hex
stock as it is easier to drill and tap for the fittings.

Also the fuel system schematic. The blue thing is the pressure
regulator. The gold things are the Facit pumps and the yellow
thing is the fuel filter. A gascalator(s?) could be added on the
front side of the firewall

> Paul Lamar

Paul,

I have been following the discussions regarding the development
of your needle valve fuel system and its been quite fascinating. I
have assumed that the end result would be used with the intakes
tuned somewhere around 6000 RPM. In such a system there will
be a wide variation in the intensity and timing of the intake pressure
pulses at the slide throttle depending on the engine RPM. Isn't this
going to result in a very nonlinear fuel feed?

Fred O.

It averages out. A lot of timed systems don't help
at high RPM. Constant dribble systems seem to work just
as well. The primary reason timed systems were developed was
to deal with the draconian smog rules. Cars are checked
on an archaic driving cycle. Somebody jumped in a car about
30 or 40 years ago, drove around the block with modest acceleration,
and recorded the speed and idle as a function of time.

See the attached chart.

This became THE cast in concrete EPA driving cycle.
Since most of the time was spent at small throttle
openings or idle that made a large difference on how smog output
and MPG were calculated. Hence the extreme focus on low power,
low throttle openings, idle and cold start up. In this case timed
EFI systems are mandatory.

BTW with any tuned intake system there will be a cloud of fuel
vapor outside the runner so some sort of plenum is mandatory to
contain this fuel cloud.

Paul Lamar ...No rotor no motor.

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