stupid question about fans

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    Author Topic: stupid question about fans  (Read 2223 times)

    Offline geneo4116

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    • 70 rt 383 auto blk/blk apprx 450hp
    stupid question about fans
    « on: May 01, 2008 - 09:32:15 AM »
    my car has a flex fan installed by previous owner, what is a clutch fan how does it work, and does it require any electric or do you just bolt on, please dont laugh to loud :screwy: :screwy: :screwy: :screwy: :screwy: :thinkerg: :thinkerg: :thinkerg: :thinkerg: :thinkerg:
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    Offline Topcat

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    Re: stupid question about fans
    « Reply #1 on: May 01, 2008 - 09:44:53 AM »
    Theres a fluid filled cylinder inside the clutch.

    The "clutch" is filled with a viscous fluid.  When the engine is cold, the fluid is thick and serves to couple the fan to the driving pulley, thereby driving the fan. As things come to temperature, the fluid warms up. When the fluid warms up, it gets thinner. The coupling effect between the fan and the hub is reduced, which causes the fan to rotate slower. A slower-speed on the fan improves fuel mileage. It does rotate slower when the engine is warm, but it never totally stops.
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    Mike, Fremont, CA.

    Offline geneo4116

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    Re: stupid question about fans
    « Reply #2 on: May 01, 2008 - 09:47:37 AM »
    will it cool better than a flex fan :villagers: :villagers: :villagers: :villagers:
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    Offline Topcat

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    Re: stupid question about fans
    « Reply #3 on: May 01, 2008 - 09:49:15 AM »
    That, I don't know.
    I would think they would both work well. Just different designs, that's all.
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    Mike, Fremont, CA.

    Offline CUDA JAS

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    Re: stupid question about fans
    « Reply #4 on: May 01, 2008 - 10:24:48 AM »
    Quote from: Topcat on May 01, 2008 - 09:44:53 AM
    Theres a fluid filled cylinder inside the clutch.

    The "clutch" is filled with a viscous fluid.  When the engine is cold, the fluid is thick and serves to couple the fan to the driving pulley, thereby driving the fan. As things come to temperature, the fluid warms up. When the fluid warms up, it gets thinner. The coupling effect between the fan and the hub is reduced, which causes the fan to rotate slower. A slower-speed on the fan improves fuel mileage. It does rotate slower when the engine is warm, but it never totally stops.

    Funny, i always thought it was the oposite.
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    74 'cuda 360/727



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    Offline Chryco Psycho

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    Re: stupid question about fans
    « Reply #5 on: May 01, 2008 - 10:51:45 AM »
    it works the other way when the fluid is cold the fan slips reducing drag , when the fluid gets hot it expandswhich puts pressure on the clutch locking the fan for increased cooling ,& yes it will cool more efficiently than the flex fan will & help fuel milage as well
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    Offline NoMope Greg

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    Re: stupid question about fans
    « Reply #6 on: May 01, 2008 - 11:02:14 AM »
    Quote from: geneo4116 on May 01, 2008 - 09:47:37 AM
    will it cool better than a flex fan :villagers: :villagers: :villagers: :villagers:

    What's with all the angry villagers?  :clueless:
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    Greg
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    Offline ksierens

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    Re: stupid question about fans
    « Reply #7 on: May 01, 2008 - 12:24:08 PM »
    I have always heard that the new style 5 blade clutch fans, with a fan shroud, will give you the best cooling.  I used to have a flex fan without a shroud and my 440 would overheat and vapor lock quite often.
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    Offline 422STROKER

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    Re: stupid question about fans
    « Reply #8 on: May 01, 2008 - 09:17:30 PM »
    I put a stock HD clutch fan in front of my 422 and it runs cooler than my 318 ever did.LOL  It might have something to do with the radiator though.  But I do have a fan shroud to put in still, just got  it in today.  I got the Fan and clutch from the local parts store, it was like 80 bucks for both.

    Tom



    By tdavist, shot with DSC-P72 at 2008-04-24
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    Tom
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    Offline Topcat

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    Re: stupid question about fans
    « Reply #9 on: May 01, 2008 - 11:36:51 PM »
    Quote from: Chryco Psycho on May 01, 2008 - 10:51:45 AM
    it works the other way when the fluid is cold the fan slips reducing drag , when the fluid gets hot it expandswhich puts pressure on the clutch locking the fan for increased cooling ,& yes it will cool more efficiently than the flex fan will & help fuel milage as well

    Yeah, sorry about that, thoughts got backwards.
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    Mike, Fremont, CA.

    Offline Chryco Psycho

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    Re: stupid question about fans
    « Reply #10 on: May 02, 2008 - 01:19:24 AM »
    No Prob TC just trying to keep the info accurate
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    Offline cudax34me

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    Re: stupid question about fans
    « Reply #11 on: May 03, 2008 - 03:07:05 AM »
    just my  :2cents:  i tried to run flex fan on my 383 years ago. for whatever reason it caused 3 waterpump pulleys to crack.learn my lesson i guess  :dupe: lol... id hate to try to find those in the boneyard now.
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    Offline Aussie Challenger

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    Re: stupid question about fans
    « Reply #12 on: May 03, 2008 - 08:35:38 AM »
      As engine/water pump speed increases greater load is placed on the water pump, the viscus fan/clutch disengages with heat and speed freeing up H.P.
      In the earlier Dodges the water pump flange used to pull out of the shaft and go through the radiator as the fan dragged more air in through the radiator, I used to put a spot weld on the shaft before fitting to try to over come this problem. One of the reasons was because the fans had an aggressive pitch on them trying to suck more air through at lower speeds. Thats when flex fans first appeared. 
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    Dave

    Offline RB2929

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    Re: stupid question about fans
    « Reply #13 on: April 11, 2012 - 04:27:52 PM »
    Continuing with the topic title, Mancini Racing has a viscous fan package (Looks like a 5-blade fan, clutch, and bolts) for $124.
    Link:  http://chucker54.stores.yahoo.net/mopvisfanpac.html

    Here’s the “Stupid question about fans” Will this bolt right up to the stock water pump?
    My engine is a 318, stock radiator and shroud.

    Thanks in advance,
    Ron
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    Offline 72cudamaan

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    Re: stupid question about fans
    « Reply #14 on: April 11, 2012 - 04:40:08 PM »
    Wow, a 4 year old thread. Talk about bringing back from the dead.   :roflsmiley:   Yes, the fan will bolt up to the water pump.
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