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how much flex in a flex fan

Discussion in 'The Hokey Ass Message Board' started by monstermachine, Mar 22, 2011.

  1. monstermachine
    Joined: Dec 13, 2010
    Posts: 14

    monstermachine
    Member
    from Michigan

    Im putting together a shroud for my Nova just now realizing that the fan is within 1/4" of scraping the sides of my new shroud. Im already thinking I am going to have to size down from an 18" to at least a 17" for clearance, but just out of curiosity wonder if any one knows if the fan will grow in diameter when Im ringing out the motor or if it will just flex forward towards the radiator?
     
    Last edited: Mar 22, 2011
  2. Brad54
    Joined: Apr 15, 2004
    Posts: 6,021

    Brad54
    Member
    from Atl Ga

    I don't know how much it will grow, but I saw a little sticker on an OE-style replacement flex fan that said "Do not exceed 4,000rpm."

    I've got a big reproduction steel fan on my '61 Suburban. I wouldn't run a flex fan... too many stories of them coming apart.

    -Brad
     
  3. 1971BB427
    Joined: Mar 6, 2010
    Posts: 9,661

    1971BB427
    Member
    from Oregon

    No on both, it wont grow and it wont flex pasr straight.
     
  4. hippy killer
    Joined: Jan 11, 2011
    Posts: 210

    hippy killer
    Member

    we have 7500 and up on my friends dirttrack car it has a flex fan
     
  5. 117harv
    Joined: Nov 12, 2009
    Posts: 6,586

    117harv
    Member

    It won't grow in diameter, but i have been told that half of the blade should be in the shroud and half out to have it work at it's best.
     
  6. Weasel
    Joined: Dec 30, 2007
    Posts: 6,695

    Weasel
    Member

    Never use a flex fan....


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  7. Aquaroscoe
    Joined: Apr 13, 2006
    Posts: 315

    Aquaroscoe
    Member

    I'm thinking the torque of the motor moving will have the fan hit the shroud
     
  8. My sons flex fan came apart while he was tuning the tri-power on his 30 sedan. Damn near cut his arm off missed him by inches only cost 600 for the new radiator. He still has pieces of it stuck in his shop wall and ceiling. If you going to run a flex fan always have your mother in-law tune your car, its a great way to get rid of her!! FLEX FANS ARE JUNK!!
     
    Last edited: Mar 23, 2011

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