[DeTomaso] Rear Window

[Julian Kift]

The dash temperature control powers both the a/c compressor clutch and fan simultaneously, one should not run without the other or you risk over pressuring the system and resulting hose blowout. If you have retrofitted a rotary compressor hopefully you also included a high/Low pressure switch in line with the a/c compressor.

Julian
________________________________________
From: DeTomaso <detomaso-bounces at poca.com> on behalf of Stephen <steve at snclocks.com>
Sent: Tuesday, March 22, 2016 12:54 PM
To: 'Jeff Detrich'
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Rear Window

You are right Jeff – especially because the fan powers from a wire on the dash-mounted temperature control that is separate from the wire that powers the a/c compressor clutch.



Stephen Nelson



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From: Jeff Detrich [mailto:jjdetrich at gmail.com]
Sent: Tuesday, March 22, 2016 12:10 PM
To: Stephen <steve at snclocks.com>
Cc: detomaso at poca.com; tjaarda at astranet.it
Subject: Re: [DeTomaso] Rear Window





On Tue, Mar 22, 2016 at 1:25 PM, Stephen <steve at snclocks.com <mailto:steve at snclocks.com> > wrote:

 The positive pressure under the rear of the car when it is moving at
   speed, coupled with the likely vacuum behind the car reduces the
   efficiency of the a/c condenser fan.  My tests suggest that around 60
   mph the air-flow through the condenser is reduced by about 40%.  At
   around 80 mph it is reduced by over 50%.  While I don't have a massive
   amount of data, what I have suggests that the decrease in flow through
   the condenser is not directly proportional to car speed, and that, in
   the 90 to 100 mph range the flow through the a/c condenser drops to
   around nothing.


Sounds like if you are going to be cruising at very high speeds, just having a kill switch on the condenser fans would be helpful. That would be easy to wire I would think.



Jeff