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stupid fan question

Discussion in 'Street/strip 400/430/455' started by jmccart, Sep 23, 2003.

  1. jmccart

    jmccart John McCarthy

    I am changing from a fixed/solid fan to a clutch fan. I guess there are 2 kinds fo clutch fans, one is thermal, what is the other?
    Thanx.
     
  2. rh455

    rh455 Well-Known Member

    One is a thermal(thermostatic) and the other is a torque limiting clutch. The thermal engages due to rising temperature. The torque limiting disengages at a certain engine speed or when 'x' amount of torque is applied.
     
  3. 70 gsconvt

    70 gsconvt Silver Level contributor

    The non-thermal on most engines will cut out at about 3500 rpm or so. Or under HARD acceleration.

    They're both nice. At speeds over 40 mph or so, you really don't need the fan anyway as long as you have your shroud in place. Definitely a good idea to have.

    Phil
     
  4. jmccart

    jmccart John McCarthy

    AAAHHHH

    Now I know. Been wondering. Thank you.
     
  5. BuickStreet

    BuickStreet Well-Known Member

    What are the power benfits to using a clutch fan? I've heard they can be quite significant but have my doubts.
     
  6. 462CID

    462CID Buick newbie since '89

    Well for one thing, you're not spinning the fan blades when you don't need to. So there's a parasitic loss you don't have to deal with. I can't imagine it's worth more than a couple HP. It's my understanding that the viscous clutch is the 'high performance' one.
     

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