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This is a discussion on Bmw build within the General forums, part of the Caferacer.net Forums category; Never seen that! Seems a lot more complicated than a single crank, but neat nonetheless!...

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  1. #41
    Senior Member thechief86's Avatar
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    Never seen that! Seems a lot more complicated than a single crank, but neat nonetheless!
    It ain't easy bein' fat and greasy.

  2. #42
    Member johncade's Avatar
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    Quote Originally Posted by TrialsRider View Post
    You must admit BMW engines look really cool when you cut big holes in them.

    … looks like you could actually move the swingarm pivot point slightly forward. (in theory
    Yeah maybe I could.. cause I think the drive shaft is angled down so maybe I could bring the wheel up with a different suspension and it would level out the difference? Idk. Sounds sketchy

  3. #43
    bfd
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    Senior Member bfd's Avatar
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    You can't move the swingarm pivot. I can't even think of why you'd want to.
    monkey likes this.

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  5. #44
    Senior Member hillsy's Avatar
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    Quote Originally Posted by johncade View Post
    Yeah maybe I could.. cause I think the drive shaft is angled down so maybe I could bring the wheel up with a different suspension and it would level out the difference? Idk. Sounds sketchy
    It's angled down to allow for the suspension to compress. Plus it is advantageous for good road holding to have an angle on the swingarm.

    Stop thinking about things you can't afford or are unnecessary - save your pennies for getting things that will at the very least make the bike run.

    I'm hoping we don't see this thing in multiple boxes on CL in 6 months.

  6. #45
    Member johncade's Avatar
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    ^good advice.. and I'd be really sad I'd it ever came to that!

  7. #46
    Senior Member hillsy's Avatar
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    Quote Originally Posted by johncade View Post
    ^good advice.. and I'd be really sad I'd it ever came to that!
    Make sure it doesn't!

    And just to expand on the swingarm angle thing - when the bike is fully loaded and under power the ideal is that the swingarm is pretty much straight in relation to the gearbox output shaft. Shaft drives have universal joints and they don't take kindly to extremes of movement under load (unlike chain and sprockets which can handle any amount).

  8. #47
    Member johncade's Avatar
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    Gotcha gotcha.. I didn't really wanna do all that extra work for something that seemed no bueno anyway

  9. #48
    Banned Witworth's Avatar
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    Quote Originally Posted by johncade View Post
    Yeah maybe I could.. cause I think the drive shaft is angled down so maybe I could bring the wheel up with a different suspension and it would level out the difference? Idk. Sounds sketchy
    The BMW engineers knew what they were doing regarding swingarm setup angle and steering geometry. The Germans turned London into a bomb site with neat rockets and were pretty snappy dressers back in the day, so take heed of their knowledge.

    Keep the bikes fork length and shock length as Herman and God intended. Or you might meet God, and never Herman not.

    Some dumb bike custom mob had a bike on one of the hipster bike T shirt cartoon websites recently. They modified the swingarm pivot so the swingarm would 'rest' in a straight line. Dumb all round. I'd rather ride a bike designed by a German chassis engineer over an effort by poved-out Spaniards. You have to give the Spanish credit for trying though.

    Que? Is hamster.

    Danger, is my business."

  10. #49
    Senior Member Tanshanomi's Avatar
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    Quote Originally Posted by thechief86 View Post
    Never seen that! Seems a lot more complicated than a single crank, but neat nonetheless!
    Or, try three cranks. Napier Deltic!

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  11. #50
    Senior Member grandpaul's Avatar
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    Quote Originally Posted by Tanshanomi View Post
    Or, try three cranks. Napier Deltic!

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    You are making my head hurt.

    It is pretty cool, though...
    GrandPaul
    Author, \"Old Bikes\"

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