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Thread: When is Four Wheel Drive engaged?

  1. 1st September 2007, 02:01 PM #21
    JDNSW's Avatar
    JDNSW
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    Quote Originally Posted by scrambler View Post
    1. To go back a bit - a freewheel is what the drive hub of most road bicycles have, allowing drive to be applied in one direction only (forward) while the wheel can travel faster than the drive chain (or shaft in the case of a Series I).

    2. One implication not mentioned yet is that engine braking in an early Series I would only transmit to the rear wheels, making driving down a steep slope a rather interesting idea.
    1. Patented 1869, first mass produced 1898 by Ernst Sachs for use on bicycles.

    Free wheel units were commonly included to the rear of the gearbox in up-market cars, particularly from the UK, in the 1930s. This is because with free wheel, almost as soon as you disengage the clutch, the gearbox will stop rotating, enabling an easy, noiseless change to any gear without needing synchromesh - and the clutch engagement will be smooth as well, since the drive will not be taken up until the gearbox output shaft is going as fast as than the tailshaft. Rover was fitting freewheel units to their cars from 1932.

    2. The freewheel lock was provided to enable front wheel engine braking as well as four wheel drive in reverse.

    John
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  2. 1st September 2007, 02:02 PM #22
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    Quote Originally Posted by scrambler View Post
    Perhaps it could be said that the early Land Rover arrangement is full-time 4 wheel DRIVE but not full-time 4 wheel ENGINE BRAKING?
    ahh but what about reverse and cornering?

    would it not be more accurate to say that Its a full time four wheel drive unless your engine braking, reversing or cornering?

    wouldnt it be easier to say its a part time fourwheel drive?

    Dave

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  3. 29th July 2013, 10:28 PM #23
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    Phhhhphttt, blowing some dust off this one

    The 80" that AlexH has just acquired, has a free wheeling transfer box and the yellow knob to lock the free wheel device.

    On our joy ride around my paddock we headed down the steepest bank a-n-d away we went!!!!

    It looks like to me that the locking mechanism isn't doing it's job as the rear wheels skidded from top to bottom.

    What should we be looking for in possible broken and/or missing parts?
    .
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  4. 3rd August 2013, 09:00 PM #24
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    4wd

    No it is doing its job the front wheels can turn faster than the back, If you turned around and tried to drive up the hill at least 1 front wheel and 1 back would spin, just like any new constant 4WD.
    The traction control is not that good or I can’t find the switch on my 48.
    Dennis
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  5. 3rd August 2013, 09:39 PM #25
    back_in
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    traction control

    Dennis
    I though you knew were the Traction Control was on a 48/49
    it is called your right foot
    you doing the Bay to Birdwood this year?
    about time you blew the spiders out of the 1957 waggon
    cheers big fellow
    Ian
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