Home » Public Forums » GMCnet » Oh, Sure, Another Fan Clutch
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| Re: Oh, Sure, Another Fan Clutch [message #247243 is a reply to message #247210] |
Sat, 12 April 2014 14:06   |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| WD0AFQ wrote on Sat, 12 April 2014 07:37 |
So Bob, I believe you have the credentials. What is your thinking on some kind of electric fan setup? That is all that most of us are interested in.
Thanks,
Dan
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I don't think we can get enough airflow with a 12V fan system on our coaches if you expect to use it in 90F ambients or higher.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247258 is a reply to message #247254] |
Sat, 12 April 2014 15:37 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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OPINION FOLLOWS:
I'm pretty sure that the principle of conservation of energy is at work here. The engine-driven fan consumes energy from the engine. It is a direct conversion that uses some probably determinable amount of power and fuel.
An electrically-driven fan has added conversion steps from physical rotational power from the engine to electrical (alternator and battery) and then another conversion from electrical energy back to physical rotation of any fan(s).
Each conversion suffers a less than 100% conversion efficiency. Basically, the direct method offers the greatest efficiency and lowest fuel cost. There are various situations in some vehicles (primarily transversely mounted engines) that dictate the use of electrical fan cooling. This does NOT mean that electrical-driven cooling is preferable.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
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~ ~ USAF and FAA, Retired ~ ~
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> To: gmclist@temp.gmcnet.org
> From: gregg_dan@hotmail.com
> Date: Sat, 12 Apr 2014 15:13:44 -0500
> Subject: Re: [GMCnet] Oh, Sure, Another Fan Clutch
>
>
>
> Bob de Kruyff wrote on Sat, 12 April 2014 14:06 >
> > WD0AFQ wrote on Sat, 12 April 2014 07:37
> > > So Bob, I believe you have the credentials. What is your thinking on some kind of electric fan setup? That is all that most of us are interested in.
> > > Thanks,
> > > Dan
> >
> > I don't think we can get enough airflow with a 12V fan system on our coaches if you expect to use it in 90F ambients or higher.
>
>
>
> Thank you very much Bob. I will go with your thought.
> Dan
>
> --
> 3 In Stainless Exhaust Headers
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> 355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247277 is a reply to message #247258] |
Sat, 12 April 2014 19:54 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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| k2gkk wrote on Sat, 12 April 2014 13:37 |
OPINION FOLLOWS:
I'm pretty sure that the principle of conservation of energy is at work here. The engine-driven fan consumes energy from the engine. It is a direct conversion that uses some probably determinable amount of power and fuel.
An electrically-driven fan has added conversion steps from physical rotational power from the engine to electrical (alternator and battery) and then another conversion from electrical energy back to physical rotation of any fan(s).
Each conversion suffers a less than 100% conversion efficiency. Basically, the direct method offers the greatest efficiency and lowest fuel cost. There are various situations in some vehicles (primarily transversely mounted engines) that dictate the use of electrical fan cooling. This does NOT mean that electrical-driven cooling is preferable.
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All true, but the other important question is "do you lose more energy because of the mechanical - electrical - mechanical conversion with a smart controller, or with a straight mechanical system with a "dumb" controller?" I don't really know the answer to that, but I'd thumbnail it as a toss-up in my case (based on how often my fan seems to run when driving down the road).
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: Oh, Sure, Another Fan Clutch [message #247283 is a reply to message #246772] |
Sat, 12 April 2014 20:18 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
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I thought about installing electric fans that blow forward for a while after getting to the campground to minimize the heat soak of the engine into the interior.
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: Oh, Sure, Another Fan Clutch [message #247288 is a reply to message #247283] |
Sat, 12 April 2014 20:32 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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| winter wrote on Sat, 12 April 2014 18:18 |
I thought about installing electric fans that blow forward for a while after getting to the campground to minimize the heat soak of the engine into the interior.
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I like this - and don't see a reason why you couldn't set them up to go both ways (by reversing the polarity when you turn off the ignition).
I think I'll look at how I can improve the air flow through my radiator to see if I can minimize the amount of time my fan clutch is engaged (I'd guess 20-25% of the time when it's 90 degrees out, and I'm at highway speed). I suspect it's probably already fairly good, with baffles on both sides of the radiator, and Ragusa "shark gills" on both front fenders, but I'm sure there are ways to get more air through there even so.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247291 is a reply to message #247145] |
Sat, 12 April 2014 20:38 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Al The HeatGuy wrote on Fri, 11 April 2014 19:04 |
Lurking because I don't have a GMC yet. However, my cousin is in the process of buying one. And I came here months ago to learn about these things so I could help him restore it.
My experience is with GM cars of all ages and styles, with a special love for Corvairs. I've had every model and every body style.
Happy to assist with whatever I can.
Not lurking to troll. I admitted I did not read all the posts, and I apologized.
Al the Heat Guy
Al Corelli
Mamaroneck, NY
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Al,
You and your cousin are welcome here.
All of us have cases where we wish buyers had spent some time with us before buying. (Me? I knew what I was buying and just lucked out to find one in great shape.)
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Oh, Sure, Another Fan Clutch [message #247296 is a reply to message #247283] |
Sat, 12 April 2014 20:52 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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"installing electric fans that blow forward "
Jerrod, Arch did that, also added misting nozzles. Really makes a noticable difference around the front of the coach on warm summer days. You can find the iintall in his pictures on the photo site.
JW Arch D 
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247314 is a reply to message #247296] |
Sat, 12 April 2014 22:59 |
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fitzmorrispr
Messages: 137
Registered: February 2013
Location: Los Angeles
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There is one question I can answer in here. "Can an all electric fan setup
cool our rigs properly?"
Yes.
Evidence?
The local transit agency, LA County's Metro, uses all electric cooling on
their 45 foot NABI CompoBuses. These units are running large inline 6
turbocharged CNG engines. And by large I do mean large. Upwards of 8
liters, as I recall.
Being rear engined, with a longitudinally mounted engine, the radiator is
alongside the block, much like it would be in a small transverse mounted
fwd car, but with lots more room. Electric is not even close to the only
option. Many of the older buses in their fleet, such as older New Flyers
and NABIs use other setups. One example runs a very long belt across the
back of the compartment to a pulley on a long shaft, which runs into a
gearbox on the back of the fan. Another runs the fan off the (gear driven)
power steering pump. This hydraulic fan was powerful enough to pull you off
balance if you happened to be next to the radiator. On similarly built
diesel school buses, I have seen setups where the radiator is mounted
diagonally in a box, so the fan can be directly belt driven, while the air
is pulled from alongside the engine.
The cooling needs of the compobus are much the same as these other variants
I've mentioned, but the compobus uses electric fans, and has no cooling
issues. It uses an array of nine small fans mounted directly to the
radiator. They look like computer fans.
Just my loose change.
-Patrick
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The Greatfruit: 1973, 26', Canyon Lands or Painted Desert, in Pineapple Yellow
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247393 is a reply to message #247314] |
Mon, 14 April 2014 13:06 |
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burtco99
Messages: 31
Registered: September 2007
Location: Montreal
Karma: 0
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Patrick,
A very interesting example that brings a few thoughts to mind.
Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?) to supply 1 or 2 powerful fan motors, or several smaller units. This is what I believe is the limiting factor in converting our coaches.
The Buses with electric fans are probably not using them because they cool better, but because they are an easier system to implement and maintain. Running electrical wires and coolant hoses through tight quarters and around corners presents fewer difficulties than routing mechanical power in the same environment. Hydraulic fans are similar to Electric in that respect.
| fitzmorrispr wrote on Sat, 12 April 2014 23:59 |
There is one question I can answer in here. "Can an all electric fan setup
cool our rigs properly?"
Yes.
Evidence?
The local transit agency, LA County's Metro, uses all electric cooling on
their 45 foot NABI CompoBuses. These units are running large inline 6
turbocharged CNG engines. And by large I do mean large. Upwards of 8
liters, as I recall.
Being rear engined, with a longitudinally mounted engine, the radiator is
alongside the block, much like it would be in a small transverse mounted
fwd car, but with lots more room. Electric is not even close to the only
option. Many of the older buses in their fleet, such as older New Flyers
and NABIs use other setups. One example runs a very long belt across the
back of the compartment to a pulley on a long shaft, which runs into a
gearbox on the back of the fan. Another runs the fan off the (gear driven)
power steering pump. This hydraulic fan was powerful enough to pull you off
balance if you happened to be next to the radiator. On similarly built
diesel school buses, I have seen setups where the radiator is mounted
diagonally in a box, so the fan can be directly belt driven, while the air
is pulled from alongside the engine.
The cooling needs of the compobus are much the same as these other variants
I've mentioned, but the compobus uses electric fans, and has no cooling
issues. It uses an array of nine small fans mounted directly to the
radiator. They look like computer fans.
Just my loose change.
-Patrick
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247395 is a reply to message #247393] |
Mon, 14 April 2014 13:22 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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An idea that has popped into my head from time to time is an identical
blade configuration to what we now have with a full coverage shroud with
diffusers between the grill and radiator, much like the 77-78 coaches have.
The differences being that the fan hub, instead of a viscous clutch, has a
thermostatically modulated feathering mechanism similar to an aircraft
propeller. One of the GMC CASCADERS builds a feathering hub for a turboprop
engine that he builds for homebuilt aircraft utilizing an APU from a
Chinook twin rotor helicopter. It looks robust enough to me for feathering
a coolant fan. What do you all think? Please don't slay the messenger, I am
just in the idea phase of this deal.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Apr 14, 2014 11:07 AM, "Les Burt" <lburt@videotron.ca> wrote:
>
>
> Patrick,
> A very interesting example that brings a few thoughts to mind.
>
> Moving air with a fan takes horsepower, the higher the air flow being
> moved, the higher the HP consumed. I don't have exact facts to quote, but I
> do believe that the OEM fans on our coaches consume several HP because of
> the air they need to move. Trying to produce the equivalent airflow with
> electric fans is going to require a fairly hefty electrical output
> (possibly 150-200a?) to supply 1 or 2 powerful fan motors, or several
> smaller units. This is what I believe is the limiting factor in converting
> our coaches.
>
> The Buses with electric fans are probably not using them because they cool
> better, but because they are an easier system to implement and maintain.
> Running electrical wires and coolant hoses through tight quarters and
> around corners presents fewer difficulties than routing mechanical power in
> the same environment. Hydraulic fans are similar to Electric in that
> respect.
>
>
>
>
> fitzmorrispr wrote on Sat, 12 April 2014 23:59
> > There is one question I can answer in here. "Can an all electric fan
> setup
> > cool our rigs properly?"
> >
> > Yes.
> >
> > Evidence?
> >
> > The local transit agency, LA County's Metro, uses all electric cooling on
> > their 45 foot NABI CompoBuses. These units are running large inline 6
> > turbocharged CNG engines. And by large I do mean large. Upwards of 8
> > liters, as I recall.
> >
> > Being rear engined, with a longitudinally mounted engine, the radiator is
> > alongside the block, much like it would be in a small transverse mounted
> > fwd car, but with lots more room. Electric is not even close to the only
> > option. Many of the older buses in their fleet, such as older New Flyers
> > and NABIs use other setups. One example runs a very long belt across the
> > back of the compartment to a pulley on a long shaft, which runs into a
> > gearbox on the back of the fan. Another runs the fan off the (gear
> driven)
> > power steering pump. This hydraulic fan was powerful enough to pull you
> off
> > balance if you happened to be next to the radiator. On similarly built
> > diesel school buses, I have seen setups where the radiator is mounted
> > diagonally in a box, so the fan can be directly belt driven, while the
> air
> > is pulled from alongside the engine.
> >
> > The cooling needs of the compobus are much the same as these other
> variants
> > I've mentioned, but the compobus uses electric fans, and has no cooling
> > issues. It uses an array of nine small fans mounted directly to the
> > radiator. They look like computer fans.
> >
> > Just my loose change.
> > -Patrick
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> Les Burt
> Montreal
> 1975 Eleganza 26ft
> A work in Progress
>
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247400 is a reply to message #247394] |
Mon, 14 April 2014 14:31 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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| A Hamilto wrote on Mon, 14 April 2014 11:15 |
| gmc.les wrote on Mon, 14 April 2014 13:06 |
Patrick,
A very interesting example that brings a few thoughts to mind.
Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?)...
|
A working system has been documented to draw 60 amps, and required an alternator upgrade to support the extra load.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=140931&rid=2083#msg_140931
|
A friend of mine has a 69 firebird that he had an aftermarket A/C installed. When they got done they put an electric fan and shroud on it . The engine ran hot so they installed a larger radiator and new water pump. It still ran hot so they went to another shop and that mechanic put a smaller water pump pulley on it and a hi flow water pump. He came by my place a couple of days ago and the engine was at 230 degrees and the new larger radiator was 235 half way down. The air wasn't even on. The new electric fan moved only a small amount of air. Next week I am pulling that fan and installing the stock shroud and a heavy duty clutch fan. If I put in a bigger electric fan that was suggested it will draw 60amps. His alternator is 37 amps that wouldn't support it and what about the needed relays and wiring etc. I feel a good clutch fan is a lot easer to deal with. Buy the way my friend is thousands of dollars poorer from this experience .
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247406 is a reply to message #247400] |
Mon, 14 April 2014 15:05 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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BTDT on my own car. I feel the pain suffered by those who have to pay for the "education" of others.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Apr 14, 2014, at 3:31 PM, roy@gmcnet.org wrote:
A Hamilto wrote on Mon, 14 April 2014 11:15
> gmc.les wrote on Mon, 14 April 2014 13:06
>> Patrick,
>> A very interesting example that brings a few thoughts to mind.
>>
>> Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?)...
> A working system has been documented to draw 60 amps, and required an alternator upgrade to support the extra load.
>
> http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=140931&rid=2083#msg_140931
A friend of mine has a 69 firebird that he had an aftermarket A/C installed. When they got done they put an electric fan and shroud on it . The engine ran hot so they installed a larger radiator and new water pump. It still ran hot so they went to another shop and that mechanic put a smaller water pump pulley on it and a hi flow water pump. He came by my place a couple of days ago and the engine was at 230 degrees and the new larger radiator was 235 half way down. The air wasn't even on. The new electric fan moved only a small amount of air. Next week I am pulling that fan and installing the stock shroud and a heavy duty clutch fan. If I put in a bigger electric fan that was suggested it will draw 60amps. His alternator is 37 amps that wouldn't support it and what about the needed relays and wiring etc. I feel a good clutch fan is a lot easer to deal with. Buy the way my friend is thousands of dollars poorer from this experience .
--
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247408 is a reply to message #247394] |
Mon, 14 April 2014 15:27 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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The hefty output of 150-200a that I mentioned was in reference to alternator output. If you add the 60a of an electric fan to all the other alternator loads that can be found on our coaches, a 150a alternator isn't going to leave you with much spare change. Not to mention the belt drive requirements such an alternator will require.
A dual Supercoupe fan set-up certainly sounds as though it has potential, but Shan has indicated that he wants to try a purpose-built single fan set-up. This tells me he isn't completely satisfied with the results he obtained.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Apr 14, 2014, at 2:15 PM, A. <markbb1@netzero.com> wrote:
gmc.les wrote on Mon, 14 April 2014 13:06
> Patrick,
> A very interesting example that brings a few thoughts to mind.
>
> Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?)...
A working system has been documented to draw 60 amps, and required an alternator upgrade to support the extra load.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=140931&rid=2083#msg_140931
--
'73 23' Sequoia For Sale
'73 23' CanyonLands For Sale
Upper Alabama
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247419 is a reply to message #247408] |
Mon, 14 April 2014 17:54 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Les,
As noted earlier Shan Rose (Duce Apocalypse) was the GMCer that installed two Thunderbird fans. AFAIK Shan has left the building.
I checked and his last message was back in June of last year.
His last message regarding the fans was in August of 2011.
I remember that when Bill Bryant noted that in all the years he had owned his GMC he never had a problem Shan got quite belligerent
with him.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
Sent: Tuesday, April 15, 2014 6:28 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Oh, Sure, Another Fan Clutch
The hefty output of 150-200a that I mentioned was in reference to alternator output. If you add the 60a of an electric fan to all
the other alternator loads that can be found on our coaches, a 150a alternator isn't going to leave you with much spare change. Not
to mention the belt drive requirements such an alternator will require.
A dual Supercoupe fan set-up certainly sounds as though it has potential, but Shan has indicated that he wants to try a
purpose-built single fan set-up. This tells me he isn't completely satisfied with the results he obtained.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Apr 14, 2014, at 2:15 PM, A. <markbb1@netzero.com> wrote:
gmc.les wrote on Mon, 14 April 2014 13:06
> Patrick,
> A very interesting example that brings a few thoughts to mind.
>
> Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts
to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to
produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?)...
A working system has been documented to draw 60 amps, and required an alternator upgrade to support the extra load.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=140931&rid=2083#msg_140931
--
'73 23' Sequoia For Sale
'73 23' CanyonLands For Sale
Upper Alabama
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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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| Re: Oh, Sure, Another Fan Clutch [message #247421 is a reply to message #246772] |
Mon, 14 April 2014 18:30 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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At what speed of the coach is the fan no longer needed or accomplishing much? 15mph, 30mph?
Has anyone collected any REAL data on the effectiveness of front baffles? I'm convinced they offer a significant benefit at speed but that is just an opinion....not a data driven fact.
My coach has one of the Aluminum Radiators from Dotson and company. In the 6K miles I've driven it since I bought it, I've heard the fan come on TWICE. The first time scared the crap out of me because I didn't know what it was.
That said, I've never really had it in hot weather....about the most was in the mid 80's.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247422 is a reply to message #247419] |
Mon, 14 April 2014 18:29 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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I was wondering why I hadn't seen any recent messages from him. I was curious to see if he could come up with something better than the Supercoupe fan set-up.
For me, a fan clutch every 3-5 years is still a cheap way of making sure you have adequate air flow for cooling. I think we have all probably spent more $$ for less results in other areas.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Apr 14, 2014, at 6:54 PM, "Robert Mueller" <robmueller@iinet.net.au> wrote:
Les,
As noted earlier Shan Rose (Duce Apocalypse) was the GMCer that installed two Thunderbird fans. AFAIK Shan has left the building.
I checked and his last message was back in June of last year.
His last message regarding the fans was in August of 2011.
I remember that when Bill Bryant noted that in all the years he had owned his GMC he never had a problem Shan got quite belligerent
with him.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
Sent: Tuesday, April 15, 2014 6:28 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Oh, Sure, Another Fan Clutch
The hefty output of 150-200a that I mentioned was in reference to alternator output. If you add the 60a of an electric fan to all
the other alternator loads that can be found on our coaches, a 150a alternator isn't going to leave you with much spare change. Not
to mention the belt drive requirements such an alternator will require.
A dual Supercoupe fan set-up certainly sounds as though it has potential, but Shan has indicated that he wants to try a
purpose-built single fan set-up. This tells me he isn't completely satisfied with the results he obtained.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Apr 14, 2014, at 2:15 PM, A. <markbb1@netzero.com> wrote:
gmc.les wrote on Mon, 14 April 2014 13:06
> Patrick,
> A very interesting example that brings a few thoughts to mind.
>
> Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts
to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to
produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?)...
A working system has been documented to draw 60 amps, and required an alternator upgrade to support the extra load.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=140931&rid=2083#msg_140931
--
'73 23' Sequoia For Sale
'73 23' CanyonLands For Sale
Upper Alabama
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