<VV> dancing vacuum readings questions

[Old Guy]

hi there...don't believe its supposed to jump around. Isolate the carbs by
plugging the balance pipe between them, as that will tell you which side it
is on. IMO a little wiggle may happen as the carb(s) are different
distances from the intake valves, I have used an oil dampened gage, but I
would change vacuum gages as they get loose in their gears and will bounce
around driving you crazy(ier)  hope this helps!   craig lamond


On Wed, Jul 23, 2014 at 4:52 PM, Ramon Rodriguez III via VirtualVairs <
virtualvairs at corvair.org> wrote:

> Hey guys, After getting the hesitation completely gone from Missy's 61 a
> few days ago it came back a day or so later (though not nearly as bad).
>
> Today I spent some time on the car and now it's running really well (for
> the moment) but I was left with some questions.
>
> The vacuum advance is once again not moving visibly when I goose the
> throttle with the car in drive and the parking brake set.  To troubleshoot
> this I hooked a vacuum gauge up to the vacuum advance line to take a
> reading and see if I was getting enough vacuum that the advance should be
> moving.  I was only getting five to seven, not enough to move the advance
> which I think is supposed to start at around eleven or so?
>
> The first question; is it normal for the vacuum gauge to be rapidly moving
> back and forth, creating a "cone" covering a range instead of a steady
> needle, or does this indicate bad valve adjustment or something?  When I
> open the throttle while connected to the ported vacuum the needle on the
> gauge creates a cone that covers from about five to about seven.  The
> vacuum gauge I use is one I took from one of those aftermarket gauge
> clusters people hang under the dash.
>
> I also hooked up to the vertical vacuum line that goes to the choke
> pulloff, on that line I get a similar effect but instead of the "cone"
> covering a range of two it covers a range of about five.  I don't trust my
> memory right now but I think at idle in gear the cone was covering about
> twelve to seventeen.  If that doesn't sound right don't give it any real
> thought until I go out and make sure that I'm remembering those numbers
> correctly.
>
> Thanks for any help,
>
> Ray R.
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