| [GMCnet] Bought that new electric clutch for the engine fan. [message #324093] |
Wed, 20 September 2017 23:05  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Got it from Jim K at Applied at the GMCMI Rally. As most of you know. The stock fan clutch is controlled by the temperature of the air as it comes off the radiator. Thus reactive to engine loads. This electrically operated fan clutch is proactive. Because of the temp sensors that are in the engine block. Thus getting a head start on the up coming hot heat loads that will be entering the radiator for cooling. The fan is larger then stock. It's from a Mercedes Benz. The electric fan clutch is from a GM truck. There's a dash light that tells you when it's on. Plus. You can turn it on yourself if desired. I thought that for all that's involved. I think it's fairly cheep at just over $400. Bob Dunahugh
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324134 is a reply to message #324093] |
Thu, 21 September 2017 14:56  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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Mine goes in (hopefully) next week and the week after. Since my MSD injection computer has a pair of fan turn-ons I will be using one of them. Keep watching this space. I'm gonna use 200 degrees as the initial set point, and run it up or back as required. The 'fan on' light and the ability to force it on both appealed to me.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324151 is a reply to message #324093] |
Thu, 21 September 2017 18:48 |
jknezek
Messages: 1057
Registered: December 2007
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I have to admit, this modification sounds like it could be a real winner. I know Matt C has reported on his, hoping to hear a few more reports before taking the plunge. But... for all that I think a true electric clutch would be a pain, this seems like the perfect middle ground.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324155 is a reply to message #324093] |
Thu, 21 September 2017 20:47 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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An electric clutch ain't going to work well. Those I've seen - mostly on large trucks - have a very substantial bearing to take the starting shock. This setup works like the OEM, but has less seal to leak through and lends itself to electronic engagement/disengagement. The trick to it is the machined adaptor to allow it to bolt to our water pump. It's built to a Mercedes spec which makes us think it will last.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324159 is a reply to message #324132] |
Thu, 21 September 2017 21:22 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Mike. Looks much like that. It's for diesel trucks. The kit comes with a hub adaptor, sensor, switches, indicator light, very nice wiring harness, and hardware. You're NOT going to find me out trying to make the kit. And I know what parts it takes.
Bob Dunahugh-
________________________________
From: Bob Dunahugh
Sent: Thursday, September 21, 2017 2:29 PM
To: gmclist@list.gmcnet.org
Subject: RE: Bought that new electric clutch for the engine fan.
Made a mistake below. Clutch, and fan are both from Mercedes Benz. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Wednesday, September 20, 2017 11:05 PM
To: gmclist@list.gmcnet.org
Subject: Bought that new electric clutch for the engine fan.
Got it from Jim K at Applied at the GMCMI Rally. As most of you know. The stock fan clutch is controlled by the temperature of the air as it comes off the radiator. Thus reactive to engine loads. This electrically operated fan clutch is proactive. Because of the temp sensors that are in the engine block. Thus getting a head start on the up coming hot heat loads that will be entering the radiator for cooling. The fan is larger then stock. It's from a Mercedes Benz. The electric fan clutch is from a GM truck. There's a dash light that tells you when it's on. Plus. You can turn it on yourself if desired. I thought that for all that's involved. I think it's fairly cheep at just over $400. Bob Dunahugh
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324167 is a reply to message #324135] |
Thu, 21 September 2017 22:47 |
KB
Messages: 1262
Registered: September 2009
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ljdavick wrote on Thu, 21 September 2017 12:54Does it have some kind of controller that "reads" the signal from the temp sender? I wonder if it would be a simple thing to connect it to the EBL fuel injection brain.
That's exactly what I've just done. Easy install, just need a relay for the EBL to control,
and a manual control switch on the dash. You also need to trim the two-piece shroud, though I
suspect if you took the horse collar off the stock shroud it'd probably work. It's a 20" fan,
vs 19" for stock, and it sticks out (toward the radiator) a little more.
I was sick to death of the endless stream of defective fan clutches, so ponied up for this one.
For our latest (very long) trip through lots of very high mountains, we had one clutch that wouldn't turn on,
and another that wouldn't turn off. Driving for hours with a stuck fan clutch is deafening and exhausting.
With the always off clutch, the coach would overheat on hills. It was a loooooong drive. Now we have to
drive back through said mountains.
The fan is a thing of beauty. It's installed, but I haven't tested it yet; hopefully tomorrow.
If it works out, I predict a best seller. Kudos to Tom Pryor for coming up with the kit.
Karen
1975 26'
[Updated on: Thu, 21 September 2017 22:48] Report message to a moderator |
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324379 is a reply to message #324376] |
Tue, 26 September 2017 07:12 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Wally,
Nice to see some data which clearly shows the increased pressure out of the cast iron impeller pump, I bought one of those from Ken
Frey at a rally and will be installing it in the Paterson Stage II engine I got out of the burned coach up in Canada.
Double trouble has an aluminum radiator in it and I don't understand how it does it but it runs BELOW the thermostat setting on cold
days at low speeds!
The link below shows the coolant flow through the engine.
http://www.gmcmhphotos.com/photos/engine-cooling-photos/p47662-455-coolant-flow.html
Does anyone have any idea why it runs below the thermostat setting?
Regards,
Rob M.
The Pedantic Mechanic
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 Wally Anderson
Sent: Tuesday, September 26, 2017 5:24 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Bought that new electric clutch for the engine fan.
About the car vs motorhome pumps. I've reused the original pump impeller on two remanufactured pumps. The last reman had a 3.875"
diameter open back impeller and the original GMC was 4.25" diameter and closed back. Just the impeller diameter calculates to about
a 12% increase in pressure across the pump . All ready had the original design impeller so why not reuse it.
https://wallyandsue.blogspot.com/2015/09/coolant-pump-impeller-r.html
JWID
--
Wally Anderson
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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: [GMCnet] Bought that new electric clutch for the engine fan. [message #324382 is a reply to message #324379] |
Tue, 26 September 2017 08:33 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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USAussie wrote on Tue, 26 September 2017 08:12Wally,
<snip>
Double trouble has an aluminum radiator in it and I don't understand how it does it but it runs BELOW the thermostat setting on cold
days at low speeds!
<snip>
Regards,
Rob M.
Rob,
I think I know.
When I had that wrong - runs too much - fan clutch, my engine rarely got to 195. I though it was the OE instrument's error, but the Digipanel (once installed) agreed. I was a bit confused until I remembered doing heat balances on several different engines. These in test cells and there were flow meters and thremocouples everywhere and a massive data-ack to accumulate a S-pot of data. At less than a sustained WOT, a large portion of the cooling was actually done by the lube oil....
Our lube oil is cooled in a radiator that is out in the cold. It could easily be dissipating the majority of the rejected heat and the airflow over the engine could do most of the rest. This would explain why my new fan that is only running when it should finally allows the engine to get to operating temperatures.
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: [GMCnet] Bought that new electric clutch for the engine fan. [message #324393 is a reply to message #324382] |
Tue, 26 September 2017 11:44 |
Sandra Price
Messages: 709
Registered: May 2006
Karma: 1
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Senior Member |
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Matt, maybe I missed something. What type of new fan do you have?
Bob Price
On Sep 26, 2017 8:34 AM, "Matt Colie" wrote:
> USAussie wrote on Tue, 26 September 2017 08:12
>> Wally,
>>
>> Double trouble has an aluminum radiator in it and I don't understand how
> it does it but it runs BELOW the thermostat setting on cold
>> days at low speeds!
>>
>> Regards,
>> Rob M.
>
> Rob,
>
> I think I know.
>
> When I had that wrong - runs too much - fan clutch, my engine rarely got
> to 195. I though it was the OE instrument's error, but the Digipanel (once
> installed) agreed. I was a bit confused until I remembered doing heat
> balances on several different engines. These in test cells and there were
> flow
> meters and thremocouples everywhere and a massive data-ack to accumulate a
> S-pot of data. At less than a sustained WOT, a large portion of the
> cooling was actually done by the lube oil....
>
> Our lube oil is cooled in a radiator that is out in the cold. It could
> easily be dissipating the majority of the rejected heat and the airflow over
> the engine could do most of the rest. This would explain why my new fan
> that is only running when it should finally allows the engine to get to
> operating temperatures.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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