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best mechanical fan for big block #1597174
03/23/14 09:52 AM
03/23/14 09:52 AM
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina Offline OP
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dangina  Offline OP
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Lethbridge, AB, Canada
for reliability I would like to keep the stock fan setup. Question whats the best to buy out there? flexalite? viscous?

Re: best mechanical fan for big block [Re: dangina] #1597175
03/23/14 10:36 AM
03/23/14 10:36 AM
Joined: Jan 2003
Posts: 21,137
Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
therocks  Offline
oh wait.but hey.lets see.oh yeah.
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Niles , Ohio
We run Summits stainless flex fans.IIRC mine is 18 inchs on my 65 440 with shroud.Its been on at least 20 years.Keeps the BB at 180 all day even when its in the 90s.My kids 413 runs the same with no shroud and has been on at least 8 years.Had a smaller one on my Jeep years ago.I ran it for at least 10 years and plowed with it.It almost ran too cold in the winter.Rocky


Chrysler Firepower
Re: best mechanical fan for big block [Re: dangina] #1597176
03/23/14 10:51 AM
03/23/14 10:51 AM
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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mikemee1331 Offline
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bethlehem pa
Quote:

for reliability I would like to keep the stock fan setup. Question whats the best to buy out there? flexalite? viscous?



not to step on Rocky's toes but i've used the stock viscous fan setup for years without issue.

Re: best mechanical fan for big block [Re: mikemee1331] #1597177
03/23/14 10:58 AM
03/23/14 10:58 AM
Joined: Jan 2003
Posts: 27,603
So Cal
autoxcuda Offline
Too Many Posts
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So Cal
It used to be the Mopar Performance viscous fan package. But I think they have got real expensive?


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Re: best mechanical fan for big block [Re: autoxcuda] #1597178
03/23/14 11:07 AM
03/23/14 11:07 AM
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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mikemee1331 Offline
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bethlehem pa
Quote:

It used to be the Mopar Performance viscous fan package. But I think they have got real expensive?



$120 from Mancini. that's where i got mine years ago but i can't remember what i paid

Re: best mechanical fan for big block [Re: dangina] #1597179
03/23/14 01:23 PM
03/23/14 01:23 PM
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn Offline
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Blair County,PA
Personally,I wouldn't give any flex fan room under my hood but that's just me.

Re: best mechanical fan for big block [Re: therocks] #1597180
03/23/14 01:29 PM
03/23/14 01:29 PM
Joined: Jan 2004
Posts: 3,001
Coram, NY
Pool Fixer Offline
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Coram, NY
Quote:

We run Summits stainless flex fans.IIRC mine is 18 inchs on my 65 440 with shroud.Its been on at least 20 years.Keeps the BB at 180 all day even when its in the 90s.My kids 413 runs the same with no shroud and has been on at least 8 years.Had a smaller one on my Jeep years ago.I ran it for at least 10 years and plowed with it.It almost ran too cold in the winter.Rocky





another vote for the stainless blades of death. Sure they will cut you open if you so much as look at them crooked, but they do an awesome job cooling. When I ran one I painted it black so it wasnt so obvious.

Re: best mechanical fan for big block [Re: Pool Fixer] #1597181
03/23/14 05:37 PM
03/23/14 05:37 PM
Joined: Dec 2004
Posts: 10,658
Rittman Ohio
fourgearsavoy Offline
I Live Here
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Rittman Ohio
I'm using the 5 blade MP viscous fan on my car now and I like it. I have used the one piece plastic fan on my old engine and that thing really moved some air.
Gus


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Re: best mechanical fan for big block [Re: dangina] #1597182
03/23/14 07:59 PM
03/23/14 07:59 PM
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Posts: 16,124
Omaha Ne
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TJP Offline
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Omaha Ne
Clutch fan which I'm assuming is what is meant by Viscous. With a thermal clutch they only work when needed and yes with a shroud they will move some air.

Re: best mechanical fan for big block [Re: TJP] #1597183
03/23/14 10:23 PM
03/23/14 10:23 PM
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina Offline OP
pro stock
dangina  Offline OP
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Lethbridge, AB, Canada
thanks guys was thinking of picking up the viscous one from mancini

Re: best mechanical fan for big block [Re: dangina] #1597184
03/23/14 10:42 PM
03/23/14 10:42 PM
Joined: Jan 2007
Posts: 7,664
IN
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ahy Offline
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I run the 5 blade MP thermal viscous setup on a 496 with shroud. It cools great in an AC application. I have a 7 blade fan as backup but haven't used it. If you have your stock fan, the Hayden thermal vicious clutches are supposed to be pretty good. The standard duty clutch matches with a standard fan. The heavy duty is for the 7 blade. I haven't needed it as the MP kit has worked fine.

Re: best mechanical fan for big block [Re: ahy] #1597185
03/24/14 09:35 AM
03/24/14 09:35 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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Posts: 24,562
Brookeville, Md
The MP fan kit is nice but expensive. I run the Summit 18.5" plastic fan. It works well and it's easy to install and work around. Flex fans are heavy and tend to cut fingers/knuckles.


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Re: best mechanical fan for big block [Re: Mr.Yuck] #1597186
03/24/14 09:38 AM
03/24/14 09:38 AM
Joined: Mar 2007
Posts: 9,336
South-Central (Sebring), FL
Commando1 Offline
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South-Central (Sebring), FL
So basically there is no general consensus.

Re: best mechanical fan for big block [Re: Commando1] #1597187
03/24/14 10:12 AM
03/24/14 10:12 AM
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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mikemee1331 Offline
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bethlehem pa
Quote:

So basically there is no general consensus.



come on, this is Moparts! did you really expect one?? i think the one thing we will all agree on with this is the shroud. gotta have it...

Re: best mechanical fan for big block [Re: Commando1] #1597188
03/24/14 10:13 AM
03/24/14 10:13 AM
Joined: Nov 2003
Posts: 12,525
Western Colorado High Desert
moparmarks Offline
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Western Colorado High Desert
Viscous with clutch.
I also have a non-clutch Viscous fan.

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Re: best mechanical fan for big block [Re: Commando1] #1597189
03/24/14 10:16 AM
03/24/14 10:16 AM
Joined: Jan 2003
Posts: 5,932
Athens, Greece
Pyper70 Offline
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Athens, Greece
I have the 7-blade Mopar Clutch fan with a Hayden viscous. Always with a shroud. 440+727. Used to never get past 170º..These days it climbs to 200º...but I have to flush my cooling, its been years.

I couldn't find any for my buddy's 72' Roadrunner so we opted for the 5-blade with viscous clutch. His is a 440 4spd car and his temperature never gets past 170º.

Had another friend with a 68 Coronet 383 and he had a flex fan on his until it committed suicide...the fan blade sheared clean off and shredded his hood....It was half in and half out of the hood. Luckily he was driving and not adjusting something under the hood...could have proven fatal


Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
Re: best mechanical fan for big block [Re: mikemee1331] #1597190
03/24/14 11:42 AM
03/24/14 11:42 AM
Joined: Jan 2003
Posts: 21,137
Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
therocks  Offline
oh wait.but hey.lets see.oh yeah.
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Joined: Jan 2003
Posts: 21,137
Niles , Ohio
Dont really need a shroud.Look at a lot of OE Mopars.Most did not have shrouds.Ive had them since the 60s and most didnt have a shroud.Rocky


Chrysler Firepower
Re: best mechanical fan for big block [Re: mikemee1331] #1597191
03/24/14 11:45 AM
03/24/14 11:45 AM
Joined: Jan 2003
Posts: 21,137
Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
therocks  Offline
oh wait.but hey.lets see.oh yeah.
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Joined: Jan 2003
Posts: 21,137
Niles , Ohio
Depends on the year also.My 65 you are hard pressed to put a clutch fan on.66 up not a problem.My SS flex is as light as a plastic one.Been on like I said at least 20 years and no problems.Only fan I had break was a factory steel one.Luckily it was on start up and didnt do much damage.Rocky


Chrysler Firepower
Re: best mechanical fan for big block [Re: dangina] #1597192
03/24/14 12:02 PM
03/24/14 12:02 PM
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
S
Sport440 Offline
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Canton, Ohio
Quote:

for reliability I would like to keep the stock fan setup. Question whats the best to buy out there? flexalite? viscous?





There is only one Best Mechanical Fan

That would be the stock Viscous. It moves the air and consumes the Least amount of HP of All the other mechanical fans.

But I did use the Summit black plastic fan on my last build because it was so light. Only to learn later that it was one of the bigger HP consumers of all the other tested fans.

That Fan test is still floating around somewhere here on Moparts.

Re: best mechanical fan for big block [Re: Sport440] #1597193
03/24/14 12:39 PM
03/24/14 12:39 PM
Joined: Apr 2011
Posts: 1,520
West Palm Beach, Florida
Copper Dart Offline
pro stock
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pro stock

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West Palm Beach, Florida
just my
edit: Radiator- Spectra CU332
Fan Clutch- Hayden 2765 (Jaguar)
Fan Shroud- P2785434 mopar#
Fan- 18" (could have easily fit a 19")
Upper Hose- 70624 trim to fit
Lower Hose- 70592 trim to fit

8086705-009(3).JPG (576 downloads)
Last edited by Copper Dart; 03/30/14 01:36 PM.

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