[DeTomaso] Rear Window

Stephen steve at snclocks.com
Tue Mar 22 23:36:54 EDT 2016


Good question - I tend to keep my trunk tub in place, especially until I get
a darned CV joint to quit slinging grease.  So, yes, for these tests, the
trunk was in.

Stephen Nelson



-----Original Message-----
From: Julian Kift [mailto:julian_kift at hotmail.com] 
Sent: Tuesday, March 22, 2016 6:44 PM
To: Stephen <steve at snclocks.com>; jgkrenton at comcast.net
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Rear Window

Stephen,

Were your tests conducted with the trunk tub in place? I seem to recall
reading that the A/C function/design was dependent on the tub being in place
and have to wonder how that might affect air flow in out of the engine
compartment?

Julian

________________________________________
From: DeTomaso <detomaso-bounces at poca.com> on behalf of Stephen
<steve at snclocks.com>
Sent: Tuesday, March 22, 2016 6:06 PM
To: jgkrenton at comcast.net
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Rear Window

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



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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" <steve at snclocks.com <mailto:steve at snclocks.com> >
To: "Jeff Detrich" <jjdetrich at gmail.com <mailto:jjdetrich at gmail.com> >
Cc: detomaso at poca.com <mailto: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







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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 <mailto:steve at snclocks.com> >
Cc: detomaso at poca.com <mailto:detomaso at poca.com> ; tjaarda at astranet.it
<mailto: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%20%3cmailto: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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