I am finding this all very interesting . Now I am
wondering whether I should put a scoop over the
supercharger. Is a scoop that would fit over an 8-71
and a injector help me or hurt me ... Would it hurt
the signal to the injectors... Am I understanding this
stuff correctly....
George in DC
--- DOUG ODOM <popms@thegrid.net> wrote:
> Tom, I'm confused (more so than usual). Are we
> talking inches of water
> or pounds?
> The other doug in rainy arroyo grande, ca
>
> Thomas E. Bryant wrote:
> >
> > Thanks for your formula it is a bit more
> scientific than mine. I guess
> > I'm just a "seat of the pants" type guy. Tom
> Burkland did say that the
> > scoop should bring you to sea level efficiency if
> it is working
> > properly. He claims 8 lbs. of pressure measured in
> the scoop on their
> > former Comp Coupe at 300 MPH. Others have said the
> static pressure is 1
> > 1/2 to 2 lbs at 250 MPH.
> >
> > Tom
> >
> > "Lawrence E. & Cathy R. Mayfield" wrote:
> > >
> > > Hey Tom, good job on the formula! I had went
> about it a little differently
> > > though but with the same, I hope, results!
> > >
> > > I developed the following:
> > >
> > > Inlet Area (in sq) = (Disp * RPM *VE) / (MPH *
> 2112)
> > >
> > > Where: Disp is engine displacement
> > > RPM is RPM at which you want to run
> > > VE is volumetric efficiency of engine (1
> if you don't know)
> > > MPH is the at which you want to run in
> MPH
> > > 2112 is a combination of conversion
> factors)
> > >
> > > So, an example... my car, 306 CID, 200 MPH, 6250
> RPM, .8 VE
> > >
> > > Inlet area = (306 * 6250 * 0.8) / (200 * 2112) =
> 3.622 in sq.
> > >
> > > This provides for an exact balance of the engine
> needs. I would use a
> > > volumetric efficiency of 110% to account for
> some ram air effects, however.
> > > This is an interesting equation because the
> slower you go the larger the
> > > scoop. I think this means that when testing on
> the dyno that you need a
> > > large plenum and inlet. Tom, does your equation
> do this also?
> > > Unfortunately, adding a scoop or the inlet adds
> some drag to the car, but
> > > if confined within the frontal area envelope,
> shouldn't add much, if any.
> > >
> > > Neat stuff, this!
> > >
> > > mayf
> > >
> > >
>
>
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