Re: delorean air conditioning question

["David Teitelbaum" <jtrealty@xxxx>]

You have to think of it the other way around. A 20 micron vacuum is
lower than a 700 micron vacuum. Just because the pump can get to a
particular vacuum is no indicator of the vacuum you can achieve on a
system. Because of the cumulative effect of multiple leaks, from
service connections to the service hoses to all the connections,
hoses, and seals in the system you are trying to vacuum you cannot get
that hard a vacuum. The main point is the harder the vacuum you can
reach and the longer you can maintain it is a measure of the tightness
of the system and the ability to remove the previous gasses and
moisture. The better you can do that the better (and longer) the
system will work. I use a Robinson dual stage and I change the oil
frequently.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, john fredt <hecklerkochgmbh@xxxx> wrote:
> This pumps specs say it can only pull 20 microns and it was
extremely expensive.I cant imagine what one that pulls 700 microns
would cost .Something seems a little wrong with this picture.what kind
of pump do you use?