[DeTomaso] Rear Window
Mike Drew
MikeLDrew at aol.com
Wed Mar 23 01:07:45 EDT 2016
I remember years ago somebody tested a low profile replacement for the stock AC fan and the stock can greatly outperformed it?
Stock ain't broke--don't fix it. :)
Mike
Sent from my iPhone
On Mar 22, 2016, at 20:54, "Stephen" <steve at snclocks.com> wrote:
> 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
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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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>> Dulcimers galleries
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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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