Re: [T3] Injector interchangability?

["David V.N." <rmcevoy1@twcny.rr.com>]

Boy,oh boy,screwwed that up.
PS still maxed out!

"....the whole world , Chico. And everything in it."

David V. Nelson
1969 Fastback FI (no matter what!)


----- Original Message ----- 
From: "David V.N." <rmcevoy1@twcny.rr.com>
To: <type3@vwtype3.org>
Sent: Tuesday, December 09, 2003 12:04 AM
Subject: Re: [T3] Injector interchangability?


>
> ----- Original Message ----- 
> From: "Jim Adney" <jadney@vwtype3.org>
>
> > > On 12/5/2003 Jim Adney wrote:
> > > > Hmmm.... Would this also be the correct relationship between
pressure
> drop
> > > > across the intake venturi and airflow thru it?
> > >
> > > Yes. The relationship (Bernoulli's Equation if you're interested)
holds
> for
> > > a venturi too.
> >
> > I had a chance to think about this a bit more over the weekend and
finally
> > realized that we don't really care how the pressure drop across the
> venturi
> > goes. It's still the pressure in the intake air distributor that is
> feeding the
> > cylinders, and that is what the PS is measuring.
>
> I think you would still want to consider where in the air distributor that
> the measurement is
> being taken.At the "mouth" of the distibutor the velocity would be
> greatest=high vac.Further in
> ,velocity would drop=lower vac.I believe that the port is centered where
the
> air takes the turn
>  into the runners.Move the port rearward(back to the rear of the
car)=richer
> mixture and vice-
> versa.
>
> >
> > So I still think an appropriate adjustment would be to increase the fuel
> > pressure in proportion to the increase in displacement. This would be a
> linear
> > approximation to the actual engne needs, which would be correct except
for
> the
> > non-linearity in the pressure drop between the IAD and the cylinder.
>
> Don't think there's a shoulder in there.Should be linear enough.
>
> <Porting
> > the heads somewhat, should actually compensate for that latter effect
> somewhat.
>
> Hmm....
>
>
> "....the whole world , Chico. And everything in it."
>
> David V. Nelson
> 1969 Fastback FI (no matter what!)
>

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