[DeTomaso] Rear Window

Stephen steve at snclocks.com
Tue Mar 22 23:54:11 EDT 2016


Hmmm - looks like a 10 inch opening in the original shroud, and Spal makes a
low-profile pusher -
https://jet.com/product/detail/2aa79945005d4343a7ecd53e0cdd1409?gclid=CLKtuP
nz1csCFUVhfgodUd8LVQ  only 2.05 inches thick.  Hmmm.  650 CFM.  Only $58.

Stephen Nelson



-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Dave
Sent: Tuesday, March 22, 2016 7:42 PM
To: detomaso at poca.com
Subject: Re: [DeTomaso] Rear Window

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
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>     Click here for our new [3]Hammered Dulcimers galleries
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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" <[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/>
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>     finding happiness in retirement
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>
>     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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