All,
The suggestions I recieved were that the port on the bottom of the
Stromberg should have vacuum at idle and that the retard unit would
be fine if disabled.
I took the air cleaner off this evening and here is what I found -
the port is indeed on the engine side of the butterfly valve and when
the car is idling I can feel suction on my finger when I hold it over
the port, the suction goes away when I ran the idle up.
I set the timing to 10deg BTDC but I haven't taken it out for a drive
yet.
I'm planning on butting a screw into the port on the carb to cap this
off.
Berger Bob
78 Spitfire
St. Louis, MO
On Oct 12, 2008, at 7:02 PM, Greg Rowe wrote:
> From the handful of carbs that I've seen, the bottom connection
> is ported vacuum and the upper one is manifold vacuum, but my
> expereince is hardly comprehensive so take it with a grain of
> salt. Probably the most sensible thing to do is either hook
> up a vacuum gauge or if you don't have a vacuum gauge, hook up
> a timing light and check the timing at idle and at 3000 rpms with and
> without the vacuum line to the dizzy connected. That will quickly
> show you if the retard is operating as it should.
>
> The other question in my mind is why you would even want
> vacuum retard, IMHO leaving it unplugged is the most sensible
> option.
>
> Greg Rowe
> 79 Spitfire
> Hatfield PA
>
> --- In nass@yahoogroups.com, Berger Bob <bberger720@...> wrote:
> >
> > All,
> >
> > The single Stromberg carb I have on my car has the vacuum port on
> the
> > bottom. Is this a port that will have vacuum at idle? or at speed?
> >
> > This carb is not original to my car. The distributor is original
> and
> > I have an original Opus ignition that works, I'm just trying to
> > figure out if this vacuum port will work with the stock vacuum
> retard
> > unit.
> >
> > I currently have this disconnected and the timing set to 10deg
> Before
> > TDC.
> >
> > Thanks for your help.
> >
> > Berger Bob
> > 78 Spitfire
> > St. Louis, MO
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
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