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Clutch fans..What's the difference.....................
#1058111
08/20/11 09:34 PM
08/20/11 09:34 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Joplin, MO USA
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The reason why I ask, is that I'm thinking of putting that style in my 86 RC that was factory with the 360 the 80's style radiator. But I have a 446 motor in it now, and was wondering if I should get one for a Big block or one that fits the cooling system for that year/360?
Moparlee
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Re: Clutch fans..What's the difference.....................
[Re: mikemee1331]
#1058113
08/20/11 09:55 PM
08/20/11 09:55 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
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Florida
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I just swaped the HD thermo clutch with 7 blade fan from my 85 SB to the 440 in the 88 truck. just order a HD max cooling thermo clutch for a mid 80s dodge truck,I use an 86 3/4 ton for the counter jerk to key in. for an upgrade in rad capacity the 86 3/4 ton has a rad thats the same size wide and bolts in but is 2-3 inches taller,has its on metal fan shroud. the differance is one is thermocoupler and one is viscus fluid you want the one with the spring coil on the front  I would up to a 7 blade fan on the 446 as well.
Last edited by scratchnfotraction; 08/20/11 10:02 PM.
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Re: Clutch fans..What's the difference.....................
[Re: scratchnfotraction]
#1058114
08/20/11 10:26 PM
08/20/11 10:26 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
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bethlehem pa
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Quote:
I just swaped the HD thermo clutch with 7 blade fan from my 85 SB to the 440 in the 88 truck.
just order a HD max cooling thermo clutch for a mid 80s dodge truck,I use an 86 3/4 ton for the counter jerk to key in.
for an upgrade in rad capacity the 86 3/4 ton has a rad thats the same size wide and bolts in but is 2-3 inches taller,has its on metal fan shroud.
the differance is one is thermocoupler and one is viscus fluid
you want the one with the spring coil on the front
I would up to a 7 blade fan on the 446 as well.
i really need to get out of the 60's............ 
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Re: Clutch fans..What's the difference.....................
[Re: larrymopar360]
#1058116
08/26/11 06:11 PM
08/26/11 06:11 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Ok, guys this is what's on it now. Which looks to be a factory style five blade flex fan? I'm not sure if I can get another three inches of Radiator in my RC. Would it darn near be sitting on the core support or is it taller also? Mines 26 X 18 X 2, three core.
Moparlee
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Re: Clutch fans..What's the difference.....................
[Re: Robbins]
#1058117
08/26/11 06:12 PM
08/26/11 06:12 PM
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Posts: 4,920
Joplin, MO USA
Robbins
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Do you think that this is would be better, it's what I got laying around? Scratchin, you were talking a 7 blade, but I did notice that there is a six blade aftermarket fan from amazon .
Moparlee
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Re: Clutch fans..What's the difference.....................
[Re: ahy]
#1058122
08/27/11 06:01 AM
08/27/11 06:01 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
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Florida
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yes SB and BB fan should swap I got my JY 7 blade fan from an AMC Hornet,bolted right to the HD thrmo clutch and have had it on the SB and BB. any clutch fan blade should bolt to the mopar clutch,IIRC the 86 3/4 ton truck rad is taller and uses a metal fan shroud it will bolt right in like the one you have but the top is above the core support,it has room under the hood and fills it up. check your fan size as the AMOZON one is 19.5"...want to make sure it fits in the shroud...measure the mech fan balde thats on there and use it as a guide 
Last edited by scratchnfotraction; 08/27/11 06:05 AM.
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Re: Clutch fans..What's the difference.....................
[Re: az426john]
#1058123
08/27/11 10:20 AM
08/27/11 10:20 AM
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Joined: Mar 2007
Posts: 9,336
South-Central (Sebring), FL
Commando1
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South-Central (Sebring), FL
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Quote:
The 5 blade pictured looks like the Mopar Performance unit that I have run on my 67 GTX in Arizona with no problems.
That 5 blade pictured looks like a broken seven blade fan. 
That thing could not possibly be balanced.
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Re: Clutch fans..What's the difference.....................
[Re: Commando1]
#1058124
08/27/11 10:28 AM
08/27/11 10:28 AM
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Joined: Jan 2007
Posts: 7,664
IN
ahy
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IN
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Quote:
Quote:
The 5 blade pictured looks like the Mopar Performance unit that I have run on my 67 GTX in Arizona with no problems.
That 5 blade pictured looks like a broken seven blade fan.
That thing could not possibly be balanced.
Looks sort of funny but that's how they are made. Apparantly uneven spacing prevents annoying resonance (noise and stress). The pair of two blades is close together vs the group of 3 that's spread out so it does balance.
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Re: Clutch fans..What's the difference.....................
[Re: ahy]
#1058125
08/27/11 11:59 AM
08/27/11 11:59 AM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Thanks again, guys what are some of the ways to see if they are good or as far as the clutch goes. After it get to temperature and you shut it off should be able to turn it or should it be locked up? Thanks again for you guy's input.
Moparlee
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Re: Clutch fans..What's the difference.....................
[Re: ahy]
#1058128
08/28/11 12:23 AM
08/28/11 12:23 AM
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Joined: Mar 2011
Posts: 1,653
Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,653
Cut and Shoot, TX
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Quote:
Quote:
Quote:
The 5 blade pictured looks like the Mopar Performance unit that I have run on my 67 GTX in Arizona with no problems.
That 5 blade pictured looks like a broken seven blade fan.
That thing could not possibly be balanced.
Looks sort of funny but that's how they are made. Apparantly uneven spacing prevents annoying resonance (noise and stress). The pair of two blades is close together vs the group of 3 that's spread out so it does balance.
Fans are designed with uneven blade spacing for partial noise cancellation by combining low density with high density sound waves.
The thicker fan hub is made of the same grade of fatigue resistant steel as wheels. I used to sell the fan hub steel to one of the largest fan makers, Schwitzer of Rolla, MO, when lots of cars still had V8s with belt driven steel fans, rather than sideways engines with electric driven plastic ones.
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Re: Clutch fans..What's the difference.....................
[Re: Robbins]
#1058129
08/28/11 03:27 PM
08/28/11 03:27 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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Quote:
Thanks again, guys what are some of the ways to see if they are good or as far as the clutch goes. After it get to temperature and you shut it off should be able to turn it or should it be locked up? Thanks again for you guy's input.
look for greese around the shaft and clutch.
see if it will wobble with hands at 9 and 3 while its bolted up.
FSM said replace with a known good one
as far as them spining,it will vary by temps..some times it will spin a few times when shut down,sometimes it stops right away
some times spins ez by hand some times has a drag to it by hand when cold.
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Re: Clutch fans..What's the difference.....................
[Re: scratchnfotraction]
#1058130
08/28/11 09:04 PM
08/28/11 09:04 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Thanks. Those five blade fans are quite that's for sure. It's funny when it does kick in(clutch fan) you can tell cause you can feel the heat from it standing from the side with you head under the hood. I think that I'm going to get that HD unit from Flex a lite to see and then maybe look into electric fans. Either a helper fan like my 2002 Dakota has or total electric set up.
It helped some going to this fan, but didn't totally get what I was after.
Last edited by Robbins; 08/28/11 10:12 PM.
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