'96 Disco V8 Viscous Fan vs. Electric Fan





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  1. #1
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    Default '96 Disco V8 Viscous Fan vs. Electric Fan

    While changing the fan belt on the Disco the other night, the spanner slipped and I broke a fin off on the viscous fan . I know I have to replace it, but it made me think whether I should consider and electric fan .

    Has anyone gone from a viscous fan to an electric fan and is it something worth considering?
    Ross
    '05 Defender 110 Td5
    '96 Discovery V8i Sold

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    I've 'heard' that its not worth it and they don't cope with our SA heat.
    But I'de like to try it one day as the viscous robs power from the motor.
    A legend in his own mind

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    one of the guys here tried it and not very successful.
    he reverted to the "viscious fan"
    will try to find the fred.

    Land Rovers never die, they simply become organ donors!

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    I run a Kenlowe electric fan on my 300Tdi Defender. It copes well with the heat.

    The electric fan needs to be installed correctly and a proper thermo switch installed. The Kenlowe switch is not good enough. I would also fit a proper temperature gauge and a coolant loss sensor.

    You might find if you drive the vehicle hard the engine temperature could rise. If so then SLOW down

    My 50 pence worth

    mike
    Margaret

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    Quote Originally Posted by gemini View Post
    I run a Kenlowe electric fan on my 300Tdi Defender. It copes well with the heat.

    The electric fan needs to be installed correctly and a proper thermo switch installed. The Kenlowe switch is not good enough. I would also fit a proper temperature gauge and a coolant loss sensor.

    You might find if you drive the vehicle hard the engine temperature could rise. If so then SLOW down

    My 50 pence worth

    mike
    rise in temp could possibly be as a result of raised EGT more than the coolant system. most Tdi's locally are upgraded to the heavy duty radiator to cope with higher ambient temps.

    Land Rovers never die, they simply become organ donors!

  6. #6
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    I saw a fan in a USA mag that flattened out after reaching speed,could have opened out more though(memory lapse)-thought it was a good idea as we know that we don't need so much fan air flow once moving over a certain high speed,now to find it...
    It still worked with the viscous mounting.
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    Don't scratch where there is no itch.

    On my 80 I went from viscous to electric, but I use 2 x RunX fans. They chew 32a on startup and 18a when just running. Anything less/smaller and you will not get the cooling you need.

    Lets take this a bit sideways.

    You need (In my case)
    2 x RunX fans (scrapyard R250 ea)
    1 x thermal switch (ex Pulsar Autozone R70)
    1 x CH solenoid (ex Autozone R150)
    1 x std Hella relay (ex Autozone R25)
    2 x hrs labour for autolec (I have my own (About R600 incl material))
    6 x hrs labour to make the cowling and the adapter pipe for the thermal switch

    Hope this convinces you to rather keep it stock.
    LC 78 Troopie 1HD-FTE
    Uniglide
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    IMHO, if a viscous works, there are few things to beat it. I would stick with viscous.

    And I can help you with a blade.
    1999 Discovery 1, 300 Tdi - "Tink Tanky"
    2004 Discovery 2 Td5 - "Blink Tanky"

    "Logic is a systematic method of coming to the wrong conclusion with confidence."

    "A technician will let a system degenerate to the level of his understanding and maintain it there."

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    you are probably referring to the variable pitch fans.
    as far as i know they are fixed drive and not viscous.
    not sure exactly how the pitching is achieved?
    probably electrical actuating.
    http://www.youtube.com/watch?v=-1tsjJU255Q

    Land Rovers never die, they simply become organ donors!

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    Wow. That is brilliant.

    I think I must put a reverse switch on my 80's fans. Then see if I can get one of these for the Troopie.
    LC 78 Troopie 1HD-FTE
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  11. #11
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    I did it to my 3.9 Ran in Atlantis dunes with 33" tyres. Towed my pipe car and trailer up to PE and never had any problem. I used two fans from Midas and a vw combi 2.1 switch so that one fan would operate first then in needed the other fan.

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    The variable blade fan(thanks LL) I saw was mechanical that adjusted its own pitch after 'so many' revs was achieved so it didn't need to work as hard as at a lower rpm
    I thought at the time it looked interesting as it was for universal mountings. My thought were to keep the viscous part but change the blades
    I'm searching..
    A legend in his own mind

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    Found the site,worth a look for other stuff,but couldn't find the fan,pretty sure that it was in the catalogue that I got from them-which I requested and got within a week
    They have some great stuff
    http://www.summitracing.com/search/y...del/DISCOVERY/

    Still looking...
    A legend in his own mind

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    Buy a good quality fan complete with cowel and the correct temperature thermal switch and you should not have a problem.
    This is a photo of a fan I fitted to my latest project
    Last edited by Chris Viljee; 2011/03/16 at 08:27 PM.

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    Sorry that did not work.

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    Last edited by Chris Viljee; 2011/03/16 at 08:26 PM.

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    Thanks everyone for the feedback. Went to have a look at a couple of options for fitting an electric fan today and must say the fins look a bit flimsy with large gaps between them. Not sure if they would do the job. Also they do not come with thermo switches, so would have to come up with plan for that. So I have come to the conclusion it would be quicker and easier just to fit another viscous and I know it works.

    Now to find a spanner that fits and into the small space .
    Ross
    '05 Defender 110 Td5
    '96 Discovery V8i Sold

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    Quote Originally Posted by landyluvver View Post
    you are probably referring to the variable pitch fans.
    as far as i know they are fixed drive and not viscous.
    not sure exactly how the pitching is achieved?
    probably electrical actuating.
    http://www.youtube.com/watch?v=-1tsjJU255Q
    What a fantastic concept. Not sure if there would be enough space in my disco for that
    Ross
    '05 Defender 110 Td5
    '96 Discovery V8i Sold

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    Quote Originally Posted by biltong View Post
    IMHO, if a viscous works, there are few things to beat it. I would stick with viscous.

    And I can help you with a blade.
    Hi biltong, I think you are right. What price do the blades go for?
    Ross
    '05 Defender 110 Td5
    '96 Discovery V8i Sold

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    fan blade is around R300 odd depending where you source from.
    always look at the max power of the fan. that is a good indictaion of the throughput of the fan.
    if you could lay your hands on a second hand 2 speed fan off a BMW 735i or 740i, those things pump plenty air and because it is suitable for a high performance 4.0 V8, it will definately be adequate for your needs.

    Land Rovers never die, they simply become organ donors!

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