Thread for alternative engines

Discussion in 'DIY Home Built Motorized Bicycle (non kit)' started by Ludwig II, Oct 1, 2014.

  1. cannonball2

    cannonball2 Active Member

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    I was deeply into R/C several yrs back and these engines(Chinese) were just beginning to show up. There were similar engines in use made by various companies Desert Aircraft, 3W etc., that were excellent but pricy engines. Their HP claims were accurate.

    The Chinese engines were initially problematic, but I assume that probably been worked out by now. The smaller twins while smooth and having a cool factor didn't produce as much power as a good single. Especially the little 40-60cc. Maybe that has changed.

    All that said, a 80-100cc might make a pretty neat MB. Cooling wise(free air) I just don't see any way it would work out except in a transverse mounting. Some what of a challenge. In an aircraft the prop blast(on the ground) and ram air cools them well. It will take movement to cool them on an MB and at a pretty decent clip. Extended stop and go would not be good. The 2strokes are less tolerant than a 4stroke under these conditions. I'm sure L2 you remember the cooling "eyebrows" I added to the transverse Maytag to catch more air. The longitudinal Maytag still has its cooling fan and works well as is.

    Not trying to discourage anyone from a build just pointing out some limitations that should be considered.

    A good running well engineered 100cc MB based around one of these would way cool! I certainly would leave it carbureted though. They run fine that way.
     
    #141 cannonball2, Apr 10, 2016
    Last edited: Apr 10, 2016
  2. jmason92

    jmason92 Member

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    #142 jmason92, Apr 12, 2016
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  3. jmason92

    jmason92 Member

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    This engine is way too big for even the strongest mountainbike frame, and thus it's better suited towards full-sized motorcycle builds, but a horizontally-opposed twin Briggs, fuel-injected and twin-turbocharged using RHB3 turbos, would be bad*** to stick in a board track racer frame.

    Of course the boost would have to kick in on the low end because these motors from what I could look up are dominant in the low-end. CVT would also need to be tweaked for greater responsiveness down low too, and the drive and rear sprockets would need to be geared with a torque bias.

    Engine in action: https://www.youtube.com/watch?v=lrCA2ow4PPE

    ....Of course a 12hp single-cylinder Briggs would fit in some frames easier, but still.
     
    #143 jmason92, Apr 18, 2016
    Last edited: Apr 20, 2016
  4. jmason92

    jmason92 Member

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    #144 jmason92, Apr 20, 2016
    Last edited: Apr 20, 2016
  5. curtisfox

    curtisfox Well-Known Member

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  6. jmason92

    jmason92 Member

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    This could be used for an extreme trike build as well, provided the transmission's an auto, and rear axle can handle the torque. As for the brakes, those could be linked to a trigger on one of the handlebars, and then the gearshift could be a thumbswitch. Throttle would be handled by the twist of another handlebar. Motortrike frame would need to fit a 3.9l I4 that weighs almost 800lbs though, in addition to a radiator, and possibly an intercooler and aftercooler for the turbo. Frame would also need to handle heavy vibrations from the 4bt as well.

    http://cumminshub.com/4bt.html
     
    #146 jmason92, Apr 21, 2016
    Last edited: Apr 21, 2016
  7. jmason92

    jmason92 Member

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    Also, here's a 53cc boxer-4 that puts out [email protected] if anyone wants to try fitting a trans to it and fitting it in a frame. Gearing that would best cater the high redline would be recommended. Quad exhaust could be going out through two straight pipes on either side of the frame.

    http://www.osengines.com/engines-airplane/osmg1320/index.html

    Vid of it in action and how it would be expected to sound going down the road if pulled off. https://www.youtube.com/watch?v=EpW3acWVkGg

    69cc radial if you have room in the frame and really want to go insane: http://www.osengines.com/engines-airplane/osmg1307/index.html

    Vid of the radial in action: https://www.youtube.com/watch?v=ZoHu6DWNwRo
     
    #147 jmason92, May 3, 2016
    Last edited: May 4, 2016
  8. Ludwig II

    Ludwig II Well-Known Member

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  9. Ludwig II

    Ludwig II Well-Known Member

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    How did it end up? It looks very good from here.
     
  10. msrfan

    msrfan Active Member

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    It hasn't really ended yet, but now sports a 3D Motorsports manual clutch that I like very much.


    [​IMG]
     
  11. Ludwig II

    Ludwig II Well-Known Member

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    How wide is it, looking down from the saddle? This looks like a workable successor to the old Cucciolo.
     
  12. msrfan

    msrfan Active Member

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    Okay Lud, my motor mounts measure 2 7/8'' inside and are bolted to the original supports on the left and to the pull rope mount on the right. Over height is around 8''. I measured it in the bike, so if you want more detailed sizes I can dig out my spare engine and be more accurate with photos. Be glad to do that for you.
     
  13. Ludwig II

    Ludwig II Well-Known Member

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    #153 Ludwig II, Dec 14, 2016
    Last edited: Dec 14, 2016
  14. cannonball2

    cannonball2 Active Member

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  15. Ludwig II

    Ludwig II Well-Known Member

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    It has something about it of the pedal start 35cc moped engine I found a while ago. It may have ancestry in the Honda Novio.
     
  16. cannonball2

    cannonball2 Active Member

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    Definitely has Honda lineage.
     
  17. PeteMcP

    PeteMcP Member

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    Ludwig,

    Check out these two flatties offered for sale right now on eBay by the same seller. The green liveried one is indeed a Stuart Turner. That ex Sunderland Flying Boat genny engine is just about the sweetest thing I ever saw. I only just bid on and won a Gnome et Rhone 2-stroke yesterday on eBay or I'd be sorely tempted with either of these beauties.

    s-l500 (1).jpg s-l1600 (1).jpg s-l1600.jpg s-l1600 (2).jpg s-l500.jpg
     
    #157 PeteMcP, Nov 19, 2017 at 12:58 PM
    Last edited: Nov 19, 2017 at 1:06 PM
  18. Ludwig II

    Ludwig II Well-Known Member

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    The ABC is from the original ABC of 1920s 400 flat twin fame, so there's motorcycle lineage.
     
  19. Ludwig II

    Ludwig II Well-Known Member

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  20. Ludwig II

    Ludwig II Well-Known Member

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