IR throttle bore sizing (Re: [Diy_efi] : Ask the experts #2)

[TVS]

> Alan Lockheed has some engine analyse software that as I recall used a
> number similiar to that.
> Bruce

Thanks, nice to have a second opinion on that. Toby

> ----- Original Message -----
> From: "TVS" <tkmvs at bigfoot.com>
> To: <Diy_efi at diy-efi.org>
> Sent: Sunday, May 19, 2002 9:24 AM
> Subject: IR throttle bore sizing (Re: [Diy_efi] : Ask the experts #2)
>
>
> > > On the IR stuff the Throttle bores are generally huge.  Like on 350
> chevy
> > > each one is like a min of 2".   AIR, some were more like 2.35.
> >
> > I read in Corky Bell's "Maximum Boost" that throttle bores should be
sized
> > so that the average velocity does not exceed 300ft/sec. This is supposed
> to
> > give a good compromise between low speed driveability and flow
restriction
> > at maximum power. Does this sound about right?
> >
> > For my 998cc, 4 cylinder engine, 4x 1 1/4" throttle plates would give
> > 260ft/sec assuming 8,500RPM and VE=0.9.
> >
> > Are there any other 'rule of thumb' sizing numbers?
>
>
>
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