Meanwhile back in the basement - Central Plains

Discussion in 'Some Assembly Required' started by Tanshanomi, Oct 23, 2019.

  1. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    [February 2021: Since this thread is turning into a general-purpose thread about multiple projects, I changed the title to mimic the workshop threads of Fast Idle and 3legs. I hope this doesn't offend anybody, because my hack fabrication skills clearly don't hold a candle to those guys'. I'm not trying to imply I'm in their league, I just got sick of changing the title multiple times as the nature of my third concurrent project keeps changing. I will still update the Bultakenstein thread separately, but going forward I'll just add everything else here.]

    The "Bride of Bultakenstein" CVT bike posts begin on page 7.


    So, as somebody who loves horizontal singles, I’ve always wanted to make a Ducati Supermono replica from a production Ducati twin by fabricating the same sort of reciprocating balancer arm that the Supermono had, but designing it to bolt onto the standard crankcase in place of the vertical cylinder. I've also sort of wanted an Aermacchi single for a long time, but I'd pragmatically scratched that off my bucket list because they're a bit fussy, and parts for them are getting pretty rare and pricey. Aermacchi ownership requires being an Aermacchi guru; that just wasn't a rabbit hole I wanted to venture down at this point in my riding career.

    Well, somebody recently gave me a bare '73 Harley SS-350 Sprint frame and swingarm. I thought, why not see if I can combine those two wants into something do-able? It actually makes sense. In an existing Ducati chassis, it's an emasculated engine with one cylinder pointlessly cut off it. In this frame, it's a replacement engine that's more modern, more powerful, much smoother, and (potentially, if desired) more displacement and fuel injection.

    It's still little more than a conceptual exercise at this point, but I've started playing around with it.

    IMG_8800_HD.JPG
    The wheels and front end are Suzuki, because I happened to have parts sitting around.

    I did this photoshop prior to getting the salvage "dummy" crankcase. As it turns out, the engine will have to sit about 1"–1 1/2" higher in the frame than I envisioned it there, but I don't see any real show-stoppers so far.

    Aermacchi-Ducati-mockup copy.jpg

    This is REEEEALLY going to stretch my fabrication skills, and I am currently in the middle of another project, so don't expect this to get completed anytime soon.
    #1
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  2. chris a

    chris a Been here awhile

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    Nice idea..and technically interesting too !
    #2
  3. TUCKERS

    TUCKERS the famous james

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    Subscribed. Very interesting idea. Don't forget to take pictures (its easy to forget).
    #3
  4. nickguzzi

    nickguzzi Long timer

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    #4
  5. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    #5
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  6. r60man

    r60man Long timer

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    Ahhh, shift on the right and brake on the left, the way God intended.
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  7. DesmoDog

    DesmoDog Desmo was my dog. RIP big guy.

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    I've thought the same thing, though as I get older it seems this is one of the project ideas that has been written off due to not having nearly enough time to finsih everythign I wanted to do.

    I'll be watching with interest. I'm not sure if I hope this thread inspires me or confirms my decision...
    #7
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  8. DiggerD

    DiggerD DougFir from SuperDuke Days

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  9. DiggerD

    DiggerD DougFir from SuperDuke Days

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    [​IMG]
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  10. PaulRS

    PaulRS Dutch fool

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    Nice NorVin.

    Norton Featherbed frame with a Vincent Comet engine?

    Paul.
    #10
  11. DiggerD

    DiggerD DougFir from SuperDuke Days

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    I get the Featherbed frame.
    Not sure on the Vincent engine...was thinking it was a twin at the start, modified to a single, hence the post .
    Not my expertise..but like the concept.
    The twin Vincent in the back ground looks like it has a similar side case.
    I will admit I have a soft spot for the little HD single.
    #11
  12. DiggerD

    DiggerD DougFir from SuperDuke Days

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    P5200026.JPG P5200040.JPG
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  13. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    Vincent built and sold single-cylinder versions from the factory — a bit like a British Buell Blast.

    ebay_272266173111_1.jpg
    #13
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  14. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    The engine mounting points and backbone of the earlier style open frame would make it much tougher to try this project with. The late '73–'74 frame has a lot more room above the engine where the balancer housing will have to go.
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  15. DiggerD

    DiggerD DougFir from SuperDuke Days

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  16. CrapKerouac

    CrapKerouac Long timer

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    Cafe Racer TV did an Aernacchi build, if you're interested.
    #16
  17. Tanshanomi

    Tanshanomi Your Favorite Uncle Supporter

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    Not really related to the engine swap, but I'm currently doing a deep dive on Suzuki parts interchangeability to sort the rear wheel. God bless places like partzilla.com that provide online parts fiches.

    Suzuki-Rear-Wheel-Interchange.png
    #17
  18. nickguzzi

    nickguzzi Long timer

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    As mentioned, these were factory produced machines.
    [​IMG]
    The great John Surtees on the 500cc Vincent that drew attention to his talents - both as a rider and a mechanic/engineer.
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  19. DiggerD

    DiggerD DougFir from SuperDuke Days

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    Moto Guzzi Nuovo Falcone

    [​IMG]
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  20. nickguzzi

    nickguzzi Long timer

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    Norton's final works bike - an attempt to lighten and lower, inspired by the sucess of guzzis of various capacities.
    [​IMG]

    I saw one (maybe the only one) which had been recently rebuilt by another great, Sammy Miller. It was a few years ago now.
    The cam box shows that many design features were shared with the Manx M30. I don't know about the weight, but the bike was very low.

    Just shown because I think it is a beautiful looking bike, and there seems to be a few horizontal singles being posted.
    #20