Re: [Classic Mustang] Re: Holley vs Edelbrock

Right - of course.

But even at 100% volumetric efficiency, its a reasonable formula for
sizing maximum cu.ft. per minute of the carb. Anything less than 100%
VE goes down from there.

Sure, you can use a carb that can flow 1,500 CFM. But the fuel delivery
curve won't likely match a streetable engine, that expects to top out at
600 CFM.

Mahalo!
-Michael

Jim Ohrt wrote:
>
>
> Of course, you are assuming 100% VE and N/A. Motors rarely reach 100%
> VE anything other than NA requires you to factor the additional airflow.
>
> Want to really get it right... A wideband O2 and several dyno pulls
> or 3rd gear pulls at the appropriate location.
>
> Mahalo!!
>
> Jim Ohrt
>
> ----- Original Message -----
> *From:* Michael D. Myjak <mailto:mmyjak@virtualworkshop.com>
> *To:* classicmustang@yahoogroups.com
> <mailto:classicmustang@yahoogroups.com>
> *Sent:* Thursday, May 21, 2009 9:11 AM
> *Subject:* Re: [Classic Mustang] Re: Holley vs Edelbrock
>
> One of the most common mistakes in an engine rebuild continues to be
> over doing it with the carburetor. Again... the formula:
>
> (Disp./2 * RPM)
> -----------------
> 1728
>
> Using 5,500 RPM (for street use) and 408 Cu..In. the result is 649.31
> CFM carb.
>
> -Michael
>
> Paul Stephens wrote:
> > --- In classicmustang@yahoogroups.com
> <mailto:classicmustang@yahoogroups.com>, Dan O'Reilly <dano@...>
> wrote:
> >
> >> 730-750 strikes me as over-carbureted for a 351, isn't it? The
> >> recommendations I've been hearing are in the 600cfm range.
> >>
> >
> > Dan,
> > I was talking about a 408 W stroker. Normally a 351W is OK with
> 600 - 700 CFM on the street but when you add the extra cubic
> inches you need a bit more carb to feed it.
> > Paul
> >
> >
> >
>
>
>

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