barneymg@ntsource.com wrote:
>
> At 11:48 PM 1/3/02 -0600, Rocky Frisco wrote:
> >Scott Willis wrote:
> > >
> > > It did not seem to make any difference so mine is unhooked. A local
> > mechanic said to take it off. I am also curious. Anyone know?
> >....
> >A vacuum advance is really a non-vacuum retard, since its function is
> >called into action when vacuum is lost and the "rest state" is supported
> >by full vacuum. ....
> >
> >When you use lots of "loud pedal" the vacuum goes down and the unit
> >retards the ignition timing. ....
>
> Not for the MGA. You are describing the system used on the late production
> MGB where the vacuum is ported from the intake manifold. The MGA (and
> early production MGB) have the distributor control vacuum ported from the
> venturi of the carburetor, just upstream from the lower edge of the
> throttle plate, where you get effectively zero vacuum at idle, and maximum
> vacuum when the throttle is opened just a little.
>
> >I think the best place for the vac advance line to come off is the intake
> >manifold; this is where my MGA and all of the Minis I've owned had it.
>
> Stock MGA never had the vacuum tap on the intake manifold. - always on the
> bottom of the rear carburetor.
Live and learn. My MGA had lots of non-standard stuff from the DPO.
-Rock http://www.rocky-frisco.com
--
Red Dirt Rangers (Rocky on piano): http://www.reddirtrangers.com
JJ Cale Live (w/Rocky): http://www.rocky-frisco.com/calelive.htm
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