[Diy_efi] pressure vs flow?

[Brian Michalk]

The arrangement needs to be simple and robust.
I have a barrel valve with which to regulate flow, and have the capability
to machine different flow/angle profiles.
At this time, I'm just trying to get specs on the injectors, because if they
won't flow 20gallons per hour at 50 PSI, then I can't use them.

I'll test them this weekend and see what they do.

 Brian Michalk  <http://www.michalk.com>
Life is what you make of it ... never wish you had done something.
Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
musician, home-brewer, entrepreneur and mostly single


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Tlsalt at aol.com
> Sent: Thursday, February 06, 2003 1:58 PM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] pressure vs flow?
>
>
> Brian Michalk wrote,
>
> I want to run my EFI system at 50psi, and use the CIS injectors as backup.
> I like the atomization of the CIS injectors, but if they crack open at 30
> PSI, I don't think I'll be able to get enough flow at 50PSI unless I crank
> up my rail pressure to something closer to 90 or 100.  The only thing I
> don't like about that is the electric fuel pump really eats a lot
> of current
> making 100psi.
>
> Again, this is for an airplane with two injection systems.  The EFI was
> easy, the backup requires some more research.
>
> So, back to the CIS issue.  The only thing that makes squirting
> possible is
> pressure, therefore the plunger causes some sort of pressure variation.
>
> Hello Brian,
>
> I think what you are trying to do is possible, but it will be
> difficult to
> vary the fuel delivery without using the fuel distributor.  The opening
> pressure limit is just to prevent bleed down after the engine
> stops, if there
> is air flowing into the engine, the fuel pump is on and the injectors are
> constantly spraying.  There is no "injector off" time. What about using a
> separate CIS pump and some kind of manual flow control valve for
> a limited
> speed range?  Kinsler barrel valve with a cable?
>
> Paul Saltwick
>
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>


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