[DeTomaso] Rear Window

[Stephen]

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

-------------- next part --------------
   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


   [1]SNClocks.com

   Click here to join one of our mailing lists [2]Contact Lists

   Click here for our new [3]Hammered Dulcimers galleries

   Click here for [4]my new blog on finding happiness in retirement


   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 <[5]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

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