[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
>
>
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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
>
>
>
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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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