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Re: [GMCnet] WE ALL NEED MORE AIR [message #321597 is a reply to message #321587] Thu, 03 August 2017 16:55 Go to previous messageGo to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
Jim,

Agreed!

The problem with the GMC AC is the pressure drop through the whole system which is caused by the number of turns the air flow has to make. IIRC from my Hamilton Standard field rep days each 90° turn is like adding 5 - 7 feet of ducting. I can't remember how many turns it makes. This subject has been addressed here before as I vaguely remember stating this earlier.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Jim Kanomata
Sent: Friday, August 4, 2017 5:48 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] WE ALL NEED MORE AIR

We need to determin feet per min. velocity through the Coil, as we know
anything over 500 ft/min face volocity can cause the condensate to blow
into the ducts and water droplets will be a problem. Having a 3-4 speed can
help avoid that to some degree.
If there is a way to find the data of our origional blower , it might guide
one to avoid problems.
We can take data off all the outlets and try to get approximate cfm it
produces at MAX.
Average Vel times the area of each and add them up. We have the
instruments, but now for me to do it.

On Thu, Aug 3, 2017 at 11:47 AM, John Phillips
wrote:

> To bad it does not list a 17-39-22
> There are 3 blowers listing that I think could work
> http://www.spalautomotive.com/eng/products/view_centrifugal.
> aspx?id=017-A40-73
> http://www.spalautomotive.com/eng/products/view_centrifugal.
> aspx?id=017-A46-73
> http://www.spalautomotive.com/eng/products/view_centrifugal.
> aspx?id=017-A54-73
>
>
> On Thu, Aug 3, 2017 at 11:19 AM, KB wrote:
>
>> johnd01 wrote on Thu, 03 August 2017 10:11
>>> ​I did see some specs for the 15-1556 before I found it on Amazon. As I
>>> recall it was 14 amps max and 800 CFM at 1 inch of water. I will see if
>> I can find the data again. ​
>>
>>
>> That would be awesome. FWIW, here's a really good page I found for the
>> SPAL blower models:
>> http://www.spalautomotive.com/eng/products/centrifugal_12D.aspx
>>
>> We're trying to figure out what the oem blower runs in terms of amps.
> The
>> fusible link is 30 amps,
>> so has to run much less than that.
>>
>> Also, what size is the oem blower wheel? I'm having trouble finding
> that
>> info.
>> I think a double blower would be more efficient, but not if its wheels
> are
>> too small.
>> Lots of trade offs here.
>>
>> thanks,
>>
>> Karen
>> 1975 26'
>>
>>
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>
>
>
> --
>
> *John Phillips*
> _______________________________________________
> GMCnet mailing list
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>



--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
 
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