PWM injector driver/Mechanical system

[BamaInstrument]

I believe that the way the Hilborn works is that at low throttle most of the
fuel is bypassed back to the fuel tank.  As the throttle opens, the barrel
valve regulates and the fuel goes to the injectors instead of back to the
tank.


----- Original Message -----
From: "Brian Michalk" <michalk at awpi.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, April 08, 2001 11:20 AM
Subject: RE: PWM injector driver/Mechanical system


> > >So my question is: do I really need a crank signal to synchronize
> > >TDC with my injector firing?
> > >
> > >  Brian Michalk  <http://www.awpi.com/michalk>
> > Tare you designing youre own system?
>
> Perhaps.  I haven't yet made up my mind.
> The concept is simple.  The devil is in the details.  If I can buy a
module
> ready made that takes TP, MAF, and RPM (no lambda, no crank synchro), and
I
> can get inside of it to fiddle, that's where I would probably go.
>
> > If you want to know what it takes for a VERY simple system to work, just
> > look at how a hilborn(or similar) race mechanical system works. The pump
> > increases flow proportional to RPM. And you have a barrel valve
> > attached to
> > the throttle blades. The pump is assumed to deliver a given
> > volume of fuel
> > per revolution. As RPM increase the flow increases at the same rate. For
>
> I have a shaft driven positive displacement mechanical pump capable of
much
> more volume than I require.  I assume the Hilborn has a pump capacity that
> matches the desired fuel delivery rate.  Putting a regulator on such a
pump
> would throw the more rpm=more flow out the door, right?
>
>
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