[DeTomaso] Rear Window

Dave davel at emspace.com
Tue Mar 22 22:41:46 EDT 2016 

Or reverse the leads and turn the impeller over.
(Ok - not helpful)
dave


On 3/22/2016 6:06 PM, Stephen wrote:
>     Hmmm - reverse the leads on the existing fan or move the condenser to
>     the front of the car.  Hmmm...
>
>
>     The work I've done suggests reversing air flow would likely be pretty
>     darned effective, especially at speed.  But, will have to wait for
>     summer to see if it really does make the a/c colder.
>
>
>     I also suspect it would be interesting to be cruising down the road and
>     s/d the condenser fan - and see if the temperature at the a/c vents
>     goes up, down or holds.  Absolutely, monitor the temperature - and make
>     sure you don't over pressure your system (an increasing vent
>     temperature would be a pretty good warning).  But, it would give one a
>     better idea of the impact of a sucker fan on the condenser.
>
>
>     Fortunately 5332 is still using R12 - I ended up with around 40 pounds
>     of it when the big switch hit.  So, plan to stay on it for all my older
>     cars.  Less risk of hoses going out.
>
>
>     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: jgkrenton at comcast.net [mailto:jgkrenton at comcast.net]
>     Sent: Tuesday, March 22, 2016 4:08 PM
>     To: Stephen <steve at snclocks.com>
>     Cc: Jeff Detrich <jjdetrich at gmail.com>; detomaso at poca.com
>     Subject: Re: [DeTomaso] Rear Window
>
>
>     You could always move the condenser to the front of the car like many
>     have done.  I believe this modification is reported to be quite
>     effective.
>
>
>     Jeff Kimball/2467
>
>
>
>     _______________________________________________________________________
>
>     From: "Stephen" <[5]steve at snclocks.com>
>     To: "Jeff Detrich" <[6]jjdetrich at gmail.com>
>     Cc: [7]detomaso at poca.com
>     Sent: Tuesday, March 22, 2016 12:54:02 PM
>     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
>
>
>
>
>     SNClocks.com <[8]http://www.snclocks.com/>
>
>
>     Click here to join one of our mailing lists Contact Lists
>     <[9]http://fs19.formsite.com/kagforms/form675003155/index.html>
>
>
>     Click here for our new
>     <[10]http://www.snclocks.com/TheRestofourWorld/Hammered-Dulcimers/About
>     -Steves-Dulcimers/19824807_4sHGgj#1558377542_LKmkrT7> Hammered
>     Dulcimers galleries
>
>
>     Click here for my new blog <[11]http://www.perfectoldman.com/>  on
>     finding happiness in retirement
>
>
>
>
>     From: Jeff Detrich [[12]mailto:jjdetrich at gmail.com]
>     Sent: Tuesday, March 22, 2016 12:10 PM
>     To: Stephen <[13]steve at snclocks.com>
>     Cc: [14]detomaso at poca.com; [15]tjaarda at astranet.it
>     Subject: Re: [DeTomaso] Rear Window
>
>
>
>
>
>
>     On Tue, Mar 22, 2016 at 1:25 PM, Stephen <[16]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
>
>
>     _______________________________________________
>
>
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>     4. http://www.perfectoldman.com/
>     5. mailto:steve at snclocks.com
>     6. mailto:jjdetrich at gmail.com
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>    10. http://www.snclocks.com/TheRestofourWorld/Hammered-Dulcimers/About-Steves-Dulcimers/19824807_4sHGgj#1558377542_LKmkrT7
>    11. http://www.perfectoldman.com/
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-------------- next part --------------
   Or reverse the leads and turn the impeller over.
   (Ok - not helpful)
   dave


   On 3/22/2016 6:06 PM, Stephen wrote:

   Hmmm - reverse the leads on the existing fan or move the condenser to
   the front of the car.  Hmmm...


   The work I've done suggests reversing air flow would likely be pretty
   darned effective, especially at speed.  But, will have to wait for
   summer to see if it really does make the a/c colder.


   I also suspect it would be interesting to be cruising down the road and
   s/d the condenser fan - and see if the temperature at the a/c vents
   goes up, down or holds.  Absolutely, monitor the temperature - and make
   sure you don't over pressure your system (an increasing vent
   temperature would be a pretty good warning).  But, it would give one a
   better idea of the impact of a sucker fan on the condenser.


   Fortunately 5332 is still using R12 - I ended up with around 40 pounds
   of it when the big switch hit.  So, plan to stay on it for all my older
   cars.  Less risk of hoses going out.


   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: [1]jgkrenton at comcast.net [[2]mailto:jgkrenton at comcast.net]
   Sent: Tuesday, March 22, 2016 4:08 PM
   To: Stephen [3]<steve at snclocks.com>
   Cc: Jeff Detrich [4]<jjdetrich at gmail.com>; [5]detomaso at poca.com
   Subject: Re: [DeTomaso] Rear Window


   You could always move the condenser to the front of the car like many
   have done.  I believe this modification is reported to be quite
   effective.


   Jeff Kimball/2467



   _______________________________________________________________________

   From: "Stephen" [6]<[5]steve at snclocks.com>
   To: "Jeff Detrich" [7]<[6]jjdetrich at gmail.com>
   Cc: [[8]7]detomaso at poca.com
   Sent: Tuesday, March 22, 2016 12:54:02 PM
   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




   SNClocks.com <[8][9]http://www.snclocks.com/>


   Click here to join one of our mailing lists Contact Lists
   <[9][10]http://fs19.formsite.com/kagforms/form675003155/index.html>


   Click here for our new
   <[10][11]http://www.snclocks.com/TheRestofourWorld/Hammered-Dulcimers/About
   -Steves-Dulcimers/19824807_4sHGgj#1558377542_LKmkrT7> Hammered
   Dulcimers galleries


   Click here for my new blog <[11][12]http://www.perfectoldman.com/>  on
   finding happiness in retirement




   From: Jeff Detrich [[12][13]mailto:jjdetrich at gmail.com]
   Sent: Tuesday, March 22, 2016 12:10 PM
   To: Stephen [14]<[13]steve at snclocks.com>
   Cc: [[15]14]detomaso at poca.com; [[16]15]tjaarda at astranet.it
   Subject: Re: [DeTomaso] Rear Window






   On Tue, Mar 22, 2016 at 1:25 PM, Stephen <[[17]16]steve at snclocks.com
   [18]<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


   _______________________________________________


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