<VV> RE: vacuum advance

[srmarti]

 Larry Forman (it's his Mity-Vac)
> >tells me
> >it should begin to pull in around 9 in.Hg. And showed me how to
> modify it if
> >it began to pull in below that. This Vac. Adv. begins pulling in
> at approx.
> >20-22 in. Hg. and is fully in at approx. 40 in.Hg.

For what it's worth, standard barometric pressure is 29.92 in.Hg.  It varies
with altitude and weather a little.  Unless you are checking in a
pressurized environment it's not possible to produce 40 in.Hg. vacuum.
Gauge must be off.

Steve Marti