Home » Public Forums » GMCnet » [GMCnet] Bought that new electric clutch for the engine fan.
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324334 is a reply to message #324311] |
Mon, 25 September 2017 08:35   |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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The kit Applied has includes both a manual switch and a run light. You don't need a processor necessarily, let the temp probe or the injector system or the manual switch simply ground a relay and have the relay turn the fan clutch on. You could likely skip the relay, the clutch draws just a couple pf amps, but I don't trust the capacity of the temp probes which are all made by the heathen chinee. The relay needs very little current to pull in.
--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 #324338 is a reply to message #324311] |
Mon, 25 September 2017 08:50 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I'm assuming the 2600RPM is the constant electric motor drive speed to the clutch? With no tach display it's really hard to see the blade speed in the youtube. So am I understanding correctly the when electrical signal is present, engagement happens in a couple seconds, but disengagement takes longer for fluid to move back to non working reservoir? Good work though bringing this to reality.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324343 is a reply to message #324332] |
Mon, 25 September 2017 10:28 |
KB
Messages: 1262
Registered: September 2009
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Matt Colie wrote on Mon, 25 September 2017 06:30
I have a minor addition to Tom's post.
"REMEMBER YOU CAN HAVE A(NY) SENSOR TURN ON THE CLUTCH OR A DASH SWITCH.)
In the near term future, I plan to use the temperature into the water pump and the outlet of the A/C condenser both as control signals. Someone with a 7747 processor you enable one of the included analog switches for this function.
I strongly suggest that you include a visual indicator as the fan noise is very different and you will not be certain of what that new and non-impressive noise relates to.
Matt - near 3k on the new fan and still impressed.
I haven't found a pin on the stock 7747 ECM to control a fan, but the EBL modified version definitely has one,
and it works. I've got the fan installed (gorgeous thing) and tested all the inputs, ie a manual switch at the dash
and the relay controlled by the EBL. We've only gotten to run it at idle so far, so can't tell if the fan itself works,
but I fully expect it to. It seems to be noticeably quieter than stock, or even the asymmetric later style fan we were running,
at least at idle. The EBL makes it really easy to play with the on/off temps and a few other parameters.
We are SUPER looking forward to having this thing on our long trip home across three mountain ranges.
The trip out with two busted fan clutches was not fun.
THANK YOU again to Tom for this mod. One of the best things I've seen so far for the GMC (or other old vehicles),
and that's saying a lot.
Karen
1975 26'
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324354 is a reply to message #324351] |
Mon, 25 September 2017 14:29 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
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Am I missing something? Do we really need a fan at 2600 RPM? I am of the
opinion that the fan does little if your airspeed is 30+ MPH the fan is not
doing much for you. It is when you have been working hard and slow down or
stop that you need a more air flow. When you are stuck in traffic are you
running your engine at 2600 RPM? I let my RPM drop to 1000 or less. Have
the electric fans been investigated? I think there are some that would run
4000 CFM. Is 4000 CFM enough to keep things cool at low speed?
On Mon, Sep 25, 2017 at 10:05 AM, Donald W. Guttman
wrote:
> Does anyone know what the CFM output of the MB fan is engaged at 2600 rpm?
> --
> 1977 Palm Beach
> TZE167V100274
>
> _______________________________________________
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--
*John Phillips*
*1974 26*
*Sacramento CA*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324355 is a reply to message #324354] |
Mon, 25 September 2017 15:47 |
Richard Denney
Messages: 920
Registered: April 2010
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My fan engages coming off the tops of steep climbs when I'm still at
highway speed. The coolant temperature will work its way up to about
195-205, and the fan will kick in, dropping it back down to 180 (the
thermostat rating) in 20 or 30 seconds (yes, the stock fan is that
effective). Before anyone asks, my cooling system is tip-top, including an
aluminum radiator and a good mechanical gauge.
We've had extended discussions about airflow through the engine
compartment, and whether ducting of various types would help, but that's
how it is with my stock arrangement. And it happens even when we aren't
running the AC.
Rick "noting this is the primary control on the upper temperature boundary"
Denney
On Mon, Sep 25, 2017 at 3:30 PM John Phillips
wrote:
> Am I missing something? Do we really need a fan at 2600 RPM? I am of the
> opinion that the fan does little if your airspeed is 30+ MPH the fan is not
> doing much for you. It is when you have been working hard and slow down or
> stop that you need a more air flow. When you are stuck in traffic are you
> running your engine at 2600 RPM? I let my RPM drop to 1000 or less. Have
> the electric fans been investigated? I think there are some that would run
> 4000 CFM. Is 4000 CFM enough to keep things cool at low speed?
>
>
> On Mon, Sep 25, 2017 at 10:05 AM, Donald W. Guttman
> wrote:
>
>> Does anyone know what the CFM output of the MB fan is engaged at 2600
> rpm?
>> --
>> 1977 Palm Beach
>> TZE167V100274
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
>
> *John Phillips*
>
> *1974 26*
>
> *Sacramento CA*
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324375 is a reply to message #324363] |
Tue, 26 September 2017 04:16 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Richard,
Are you saying that your fan comes on while you are climbing at speeds over
30 MPH?
30 MPH should get should give us close to 8,000 CFM which should be more
than what the fan can deliver while stopped.
On Mon, Sep 25, 2017 at 5:22 PM, Matt Colie wrote:
> SONICJK wrote on Mon, 25 September 2017 17:25
>> Does anyone have on of these in hand?
>>
>> I'm curious why they went to the trouble and expense of including the
> fan? The factory fan is very effective, so why not just make an adapter kit
>> for the clutch?
>> Would be much less install trouble and more cost effective I'd imagine...
>> Looking again it looks like its one unit. Disregard previous post!
>
>
> Justin,
> The neolithic fan that is the stock part is very loud. It is good at
> moving noise and absorbing horsepower. That is about the sum of it.
> This new fan has aerodynamic blades and that makes a big difference. I
> really wish I still had access to an ASHRE tunnel, because I would like to
> know just how much better it is.
>
> Warning, if you have one of these fans and are checking the transmission
> fluid, do not bump the switch. You may have a problem getting the stick
> back
> in the tube.
>
> 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
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--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324377 is a reply to message #324375] |
Tue, 26 September 2017 05:45 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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Yes, I'm saying that.
Rick "noting the sometimes big difference between theory and reality" Denney
On Tue, Sep 26, 2017 at 5:17 AM John Phillips
wrote:
> Richard,
> Are you saying that your fan comes on while you are climbing at speeds over
> 30 MPH?
> 30 MPH should get should give us close to 8,000 CFM which should be more
> than what the fan can deliver while stopped.
>
> On Mon, Sep 25, 2017 at 5:22 PM, Matt Colie wrote:
>
>> SONICJK wrote on Mon, 25 September 2017 17:25
>>> Does anyone have on of these in hand?
>>>
>>> I'm curious why they went to the trouble and expense of including the
>> fan? The factory fan is very effective, so why not just make an adapter
> kit
>>> for the clutch?
>>> Would be much less install trouble and more cost effective I'd
> imagine...
>>> Looking again it looks like its one unit. Disregard previous post!
>>
>>
>> Justin,
>> The neolithic fan that is the stock part is very loud. It is good at
>> moving noise and absorbing horsepower. That is about the sum of it.
>> This new fan has aerodynamic blades and that makes a big difference. I
>> really wish I still had access to an ASHRE tunnel, because I would like
> to
>> know just how much better it is.
>>
>> Warning, if you have one of these fans and are checking the transmission
>> fluid, do not bump the switch. You may have a problem getting the stick
>> back
>> in the tube.
>>
>> 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
>>
>
>
>
> --
>
> *John Phillips*
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324385 is a reply to message #324381] |
Tue, 26 September 2017 08:41 |
jknezek
Messages: 1057
Registered: December 2007
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Jp Benson wrote on Tue, 26 September 2017 09:04Richard Denney wrote on Mon, 25 September 2017 15:47My fan engages coming off the tops of steep climbs when I'm still at
highway speed. The coolant temperature will work its way up to about
195-205, and the fan will kick in, dropping it back down to 180 (the
thermostat rating) in 20 or 30 seconds (yes, the stock fan is that
effective). Before anyone asks, my cooling system is tip-top, including an
aluminum radiator and a good mechanical gauge.
Do I understand this correctly? That the fan clutch engages after the steep climb is over and the vehicle is either going downhill or on level ground.
JP
Mine does this also. Always has. Drives me nuts.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324388 is a reply to message #324311] |
Tue, 26 September 2017 09:05 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Both of mine did/do that except pulling Culowee or Monteagle. On those it comes on about halfway up and stays on. Coming home fromLA with the 26', did the same on long grades. I propose to simply turn the new on on manually at the bottom of the hill and back off at the top.
--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 #324389 is a reply to message #324311] |
Tue, 26 September 2017 09:10 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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As to an all electric fan, it's a common failure in my Mopar vans. The problem is, an electric fan fails off and there's no way to force it on when it has failed. For the van it isn';t a problem - nearest AutoZone, they take my phone number and the failed one and hand me a new one which is good for another 80k miles or so. For a one - off electric from Summit, you're dead it the water when it quits. Yall can have it, I'll let the engine spin mine.
--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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