>
>
> I remember I was puzzled for some time when I tried to understand vacuum
> advance as i knew that the vaccum falls away to nothing at cruise and at
> high acceleration.  At cruise or acceleration I considered that there wou=
ld
> still be a requirement for advanced timing but the fact that there was
> little vacuum at cruise or acceleration seemed to be a contradiction.
>
> It wasn't until I noticed that the vacuum pickup line was taken from the
> base of the carby body where at high cruise or high acceleration there is
> an increased volume of air passing thru.  High volume thru the venturi
> equals high vacuum and vacuum advance to assist the mechanical advance.
>
>
Sorry for the hijack, but this is _wrong_.
A quick google gives this reference with a much better explanation than I'm
willing to type up
http://www.camaros.org/pdf/timing101.pdf on about the fourth page.

-Denny
(crap, am I now "that guy arguing on the internet"?)
--=20
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