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Thread: Viscous Fan Operation - Measuring its RPM

  1. 6th March 2016, 11:36 AM #11
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    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
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    Quote Originally Posted by theNEWT View Post
    Another interesting point is that it seems transitional, ie, not just on and off.
    thats how it was designed.

    as the ambient temperature in the hub builds up it begins to lock more solidly

    as engine RPM's increase the drag on the fan increases and it begins to slip more.

    as air is forced through the radiator by vehicle movement the drag decreases so the fan speeds up to increase airflow

    once the temp drops off the fan begins to slip more

    in theory...


    when its hot enough to need the fan to pull the air through the fan should always be working at its peak ability to draw air

    when its not hot enough the fan will slip more, drawing only enough power off of the engine to provide the airflow required.
    Dave

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  2. 6th March 2016, 11:42 AM #12
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    theNEWT
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    Yep..that all make sense. Pretty much what it appears to be doing.
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  3. 21st March 2016, 01:54 PM #13
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    theNEWT
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    I placed the electronics into a box and mounted it on the MadMan...

    viscous fan RPM, ST is shroud air temperature and RAT is just the ratio of RPM to temp. And yes, that's a huge crack in the windscreen.



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