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Thread: 3.5 V8 - Viscous Fan vs Fixed Fan

  1. #1
    Join Date
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    3.5 V8 - Viscous Fan vs Fixed Fan

    The 3.5 V8 in my 101 has been converted to a fixed fan - works fine with no noticeable noise over the ambient level of 101 noise. I was thinking about whether I should convert it back to the original viscous arrangement.

    Given I will need to buy the unit ($200), maybe a different water pump, and a new fan (mine is different to the OEM) I am not sure the advantages would be worth it.

    What are the advantages? A little saving on HP at higher revs would seem to be about it.

    Cheers

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  2. #2
    Join Date
    Aug 2007
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    If you're happy with the noise... fuel usage... and perhaps shortened life of the fanbelt, I'd be inclined to leave it alone till you need to.

    At least you know it's working.

  3. #3
    Join Date
    Aug 2006
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    Kingston, Tassie, OZ.
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    agreed, fixed is 100% reliable, if worried about water crossings etc just loosen the fanbelt.


    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈

  4. #4
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    Jan 2008
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    Hi Garry.
    My viscous hub in the fan locked up a few years ago and I found it locked up by accident when working on the motor.
    I was lucky and had a new viscous hub which I could fit.
    I do notice a very, very small reduction in noise on very cold mornings and very small increase in power on a cold night, but it is noting to write home about.
    I can pass on the old one for sample if you have your heart set on trying to find something that fits.

  5. #5
    Join Date
    Apr 2009
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    If the "fixed" fan is plastic, avoid lots of revs. They can spit blades. I would only use a metal fan designed for fixed use, check it occasionally for cracks. I still remember my dad's XP develop a small dent in the bonnet after a fluffed gear change. Oh, there was steam too.

  6. #6
    Join Date
    Jan 1970
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    Thanks for all the comments - looks like it is really not worthwhile converting back unless something happens.

    Hmm - yes Bee Utey it is a plastic blade. Engine does regularly sees 5000rpm - tis a fact of life in a 101.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

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