1. A Body 440 WHY NOT

    A Body 440 WHY NOT Well-Known Member

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    Just a question ,
    Why is everyone so against a flex fan ?
    ( other than being sharp edged )
    Asking for a friend. LoL :rofl:
     
  2. Dana67Dart

    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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    The theory is that they come apart and fling razer blades at people.

    IMHO, if they were so dangerous they would not be sold. My guess is any that fail, fail for over RPM, or external damage, or really old age.

    It feels like a wives tail, though I am sure there are members here who have first hand knowledge of a fan letting loose.
     
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    • Dartsun

      Dartsun Mopar Dude

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      I’m using one on my 65 dart, when I swapped to aluminum radiator my stock fan didn’t fit with the spacer. I painted flex fan black make it look stock. Works fine did cut me up installing tho lol.
       
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      • A Body 440 WHY NOT

        A Body 440 WHY NOT Well-Known Member

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        But seriously,
        street car. < 6000 rpms.
        Tight space.

        I hear people say they fly part ?
        Is that true ?
        They say tested to 9000.
         
      • Ottmundr

        Ottmundr 68 Fastback

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        I'm using one, 17" if I remember right, and either a 1/2" or 3/4" spacer to move it closer to the aluminum radiator... It weighs a LOT less than the stock fan. I didn't weigh the original after I took it off. I'd like to see how much weight I'll have shaved off when I get done. I bet it's a LOT. (Gotta make up for my fat ass).
         
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        • dano

          dano Evil Handy Man

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          I think the "fly's apart" ones are the plastic or fiberglass ones.

          I had to run an thin 18" Hayden one with my Cold Case Rad and power steering pump combo. Not a lot of room due to the add thickness of the core and even the short thermostatic clutch was too tight on room and I didn't even get to fitting a fan.
           
        • Syleng1

          Syleng1 Karma is real and Life is short... FABO Gold Member

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          "Back in the day" the fiberglass ones came apart... but the rivets were never checked.
          Even the Cal-Custom units had a note asking you to check the rivets every 3,000miles.
          the good ones like Flex-O-lite mentioned checking tightness every so many miles for wear and such.
          They have their purpose and worked fine for most.
           
        • Joey4speed

          Joey4speed FABO Gold Member FABO Gold Member

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          Terrible but true story.
          When I was a kid the very cool hot rod teenager mechanic was found dead leaning over his engine compartment.
          Flex fan piece sliced his carotid artery.
          Flimsy lightweight metal at high rpm? No thanks.
          I vowed to stay away from them, not worth the 10 hp gain.
           
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          • Syleng1

            Syleng1 Karma is real and Life is short... FABO Gold Member

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            Guess he did not read the note. Yikes -gorry story
             
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            • RammerJammer75

              RammerJammer75 Well-Known Member

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              If you can, check out the Engine Masters fan test. It was interesting to see how bad the Flex Fan is in terms of performance.
               
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              • Joey4speed

                Joey4speed FABO Gold Member FABO Gold Member

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                Yea. Our guess he was checking the timing advance.
                 
              • yellow rose

                yellow rose Overnight Sensation FABO Gold Member

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                Compared to what? I don’t do MTOD. We hate each other.
                 
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                • 33IMP

                  33IMP Well-Known Member

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                  If i remember correctly (i saw the episode a while ago) they compared a clutch fan, aluminum flex, plastic flex, and factory fixed fans, to no fan at all.
                  Clutch fan did the best, memory says -10hp, alum flex -15, plastic flex -25hp, fixed -30 or 35 hp.
                  It got my attention cause i use the plastic fan that they tested. I made a concious decision to use it cause it keeps my engine cool. I used to play around with electric fans and water pump drives to save power on a bracket car. That is, till i figured out that the power i was supposed to be saving wasnt really there, cause the engine was too hot all the time.
                   
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                  • RustyRatRod

                    RustyRatRod Lemmie see your b00bs. FABO Gold Member

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                    • j par

                      j par Well-hung Member

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                      Once I went electric fan I never looked back.. no more whirling blade of death..
                       
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                      • famous bob

                        famous bob mopar misfit

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                        Elec. fans (tried many) wont keep my car cool , period .
                        They do make 8,000 , and 10,000 rpm flex fans !---------jfyi
                         
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                        • Hellrats

                          Hellrats Just another dumbass FABO Gold Member

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                          I had one come apart on me years ago. I will NEVER run one of those thing again! It was the steel type. The rivets were still in the fan, the blade tore loose. I remember Volvo had a recall on them for that very reason.
                           
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                          • Wilma

                            Wilma Active Member

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                            Back in the 90s had one on my Swinger came apart in the burnout box and went through the hood. Don't use them.
                             
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                            • RammerJammer75

                              RammerJammer75 Well-Known Member

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                              If I remember correctly, it was a fixed metal fan, a clutched fan, and they used the plastic and aluminum flex fans.
                               
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                              • rumblefish360

                                rumblefish360 So close, yet so far away FABO Gold Member

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                                For me they look cheap. I don’t like the look of them.
                                On the practical side, there cheap to purchase BUT give up HP.
                                These (most) are also made cheaper.
                                The OE fan is an excellent cooling fan with the best being the old MP Viscous fan cooling the best while eating the least HP.
                                (Check Mancini for there version or if they have any of the old 5 blade MP stuff.)

                                This is one of the factory parts that is worth the price of admission. Looks stock and allows the best power while working like it should. A
                                Like a quality OEM part should.

                                I use the OE/MP 5 blade viscous fan on all of my stuff. Except the balls to the wall drag car. Use it with a shroud and at least 3/4 of an inch from the radiator for best results. The fan blade should be about an equal half in and half out of the shroud for proper operation. These units REALLY move some air!
                                 
                                Last edited: Nov 18, 2020
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                                • 66fs

                                  66fs FABO Gold Member FABO Gold Member

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                                  I have run Mopar OEM flex fans. No problem. However, I also never liked the look of aftermarket flex fans.
                                   
                                • CRUZE 418

                                  CRUZE 418 FABO Gold Member FABO Gold Member

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                                  My '78 Van had the factory flex fan. It was noisy, removed it at overhaul and installed a clutch fan. Probably not an issue with a noisy muscle car.
                                   
                                • 66fs

                                  66fs FABO Gold Member FABO Gold Member

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                                  They pull a lot of air at idle. It was the only fan that would keep my Dodge truck happy at extended idle. I tried everything else. Plus they are dirt simple.
                                   
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                                  • Cal Tonsley

                                    Cal Tonsley Well-Known Member

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                                    Don’t use a flex fan, they are dangerous and sooner or later will let you down.
                                    It’s just like bending a paper clip back and forth, do it enough times and it is sure to break!
                                     
                                  • yellow rose

                                    yellow rose Overnight Sensation FABO Gold Member

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                                    Two things...

                                    DAMN THAT WAS BAD.

                                    And WAY TOO MANY guys have passed since that thread was posted.
                                     
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