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Thread: Heavier Flywheel.

  1. 10th October 2008, 07:32 AM #1
    Dougal
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    Heavier Flywheel.

    I've had this rattling around inside my head for quite some time. Now I've posted up on 4BTswaps about it.
    Heavier flywheel? - Cummins 4BT & Diesel Conversions Forums

    I think the 4BD1T needs a heavier flywheel. Not only to let you use the low end torque better, but also to save the gearboxes from an early death.

    My 4BD1T flywheel is 16kg, I can easily fit a ring inside the back of the flywheel to bump the rotational inertia by 25%. With a little more work another 10% or so should be possible.
    The 4BT's have flywheels ranging from 57lb (flat disc) to 62lb (big ring of weight around the outside so even bigger rotational inertia) with a similar OD.

    Will a bigger flywheel be enough to save a lighter gearbox, even Justins Automatics?
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  2. 10th October 2008, 01:21 PM #2
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    isuzurover
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    Hmm, interesting, I didn't realise it was so light. My 2.25D flywheel is about 30kg IRC (petrol is 5-10kg lighter).
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  3. 10th October 2008, 01:53 PM #3
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    incisor
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    i was thinking about this as well ...

    i reckon it would help heaps...
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  4. 1st October 2011, 02:32 AM #4
    rovernutzz Guest
    i have been trying to find a flywheel for my 4bd1t and cant even find a standard one...... can anyone help on this ? i am in the uk and isuzu are unable to help, nor are sms diesel spares who i have bought bits from in the past. there must be some overlap as the gmc trucks in the usa used the 4bd engines. i even bought a 4bd2t engine thinking i could rob parts off that but of course they are different :O(

    any one got ideas ?
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  5. 1st October 2011, 05:40 AM #5
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    123rover50
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    Here is one in Brisbane. Finishes in a few hours. Ebay item no
    110747692255
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  6. 1st October 2011, 08:43 AM #6
    Bush65
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    Quote Originally Posted by rovernutzz View Post
    i have been trying to find a flywheel for my 4bd1t and cant even find a standard one...... can anyone help on this ? i am in the uk and isuzu are unable to help, nor are sms diesel spares who i have bought bits from in the past. there must be some overlap as the gmc trucks in the usa used the 4bd engines. i even bought a 4bd2t engine thinking i could rob parts off that but of course they are different :O(

    any one got ideas ?
    Most, but not all, Isuzu/GM with 4BD1/2 engine are fitted with auto transmissions. The USA guys have great difficulty finding flywheels to use with a manual gearbox.

    Out of curiosity what is the difference with a 4BD2T flywheel that it can't be used with a 4BD1T?
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  7. 1st October 2011, 09:29 AM #7
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    Vern
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    Just contact Isuzu in Australia if you have to, i bought a new one a few months back.
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  8. 3rd October 2011, 12:14 PM #8
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    isuzurover
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    Quote Originally Posted by rovernutzz View Post
    i have been trying to find a flywheel for my 4bd1t and cant even find a standard one...... can anyone help on this ? i am in the uk and isuzu are unable to help, nor are sms diesel spares who i have bought bits from in the past. there must be some overlap as the gmc trucks in the usa used the 4bd engines. i even bought a 4bd2t engine thinking i could rob parts off that but of course they are different :O(

    any one got ideas ?
    It may help to state which flywheel you are after? The Landrover flywheel or one of the (2-3 different) truck flywheels...

    If the truck flywheels, Soltoggio Bros wrecking in Perth has a couple of Parts 4BD1s, which had flywheels fitted last I checked. The same should go for a lot of other wreckers in AU.
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