Date:         Fri, 4 Jun 1999 10:39:42 -0400
Reply-To:     David Beierl <synergx@IBM.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <synergx@IBM.NET>
Subject:      Re: coolant pressure gauge
Comments: To: Robert Rountree <rountree@PLANETEER.COM>
In-Reply-To:  <000801beae91$18af86c0$3c9032cc@abc>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 09:01 6/4/99 -0400, Robert Rountree wrote:
>that is when I get a small dribble as air is sucked into one spot on my new
>head gaskets... cly #2 please raise your hand........I wonder if there is a
>gauge that would read Plus & Minus?

Sure.  Haven't seen one lately, but there at least used to be combined
vacuum/pressure gauges.  Try J.C. Whitney.  Or just massage the stop pin on
a regular gauge so it will deflect downscale a bit.  Or use a regular
vacuum gauge in parallel.

Has anyone figured out what useful info would be provided by a coolant
pressure gauge?  I'm a bit stumped myself.   Seems like an oil temp and
exhaust temp would be higher on the list.

What I *would* really like to know is what per cent of cooling capacity is
being used at a given moment, but I don't *think* that pressure would
easily tell that.  Or would it?  How about radiator outflow temp?  The
temperature drop across the thermostat should do it nicely.  When that goes
to zero the control action is exhausted and all that remains is to add
airflow to the radiator.  And by using two senders wired in a bridge
circuit it ought to be possible to display differential temp directly.  I'm
beginning to like this idea.

david
David Beierl - dbeierl@ibm.net