[Diy_efi] Fuel rail sizing

[huw scourfield]

So can you run sequentially over the entire rpm/load range of "this" engine?
Huw
----- Original Message -----
From: "Dave Dahlgren" <ddahlgren at snet.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, September 04, 2002 7:51 PM
Subject: Re: [Diy_efi] Fuel rail sizing


> I was alluding to the instantaneous flow at the injector opening being
different
> on the different injectors due to the pressure difference. When you open
them
> all at once the pressure difference between injectors is not the same as
opening
> them up one at a time in sequential. If you have a delta in pressure you
have to
> have a delta in flow. If you only open one injector the delta in pressure
is
> less than if you open them all at once. You have two different types of
demand,
> average and instantaneous you have to size the rail for the larger of the
two.
> The average flow is down with sequential as you would only have at most 5
of the
> six injectors firing and the peak would be down as well because you are
only
> turning on or off one injector at a time. So sorry to say you can run a
smaller
> fuel rail with sequential injection, it is less demanding on the entire
fuel
> delivery system.
> Dave Dahlgren
>
> Phil Lamovie wrote:
> >
> > Dave asked "What piece of physics would you base that on?"
> >
> > I'm not suggesting that the pressure is in any way shape or form
> > the same at the inlet point of each injector.
> >
> > I am stating that fuel rails for sequential have to be the same size
> > and deal with the same flows as batch because at 90 % duty cycle
> > at least five of the six injectors are open at any given time.
> >
> > I believe the Subject line reads "Fuel rail sizing"
> >
> > I could be wrong.
> >
> > Phil
> >
> > _______________________________________________
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>
>
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