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Two stroke V twin ?

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  • #1

    Two stroke V twin ?

    We all know it is near impossible to have a V-twin 2 stroke without separate crank chambers/ forced induction/ split crank pins. Usual crankcase induction will not work with common pin.

    Now here's what i came across over the net, a 100cc V2-2T made from 50cc Suzuki K50 single. Externally it doesn't appear to feature any serious crankcase mods to include separate chamber or offset pins by looking at the cylinder alignment.


    I could find no further info on this. What are the possibilities to configure one such?
    welcome all experts, lets discuss..

    Videos here:
    YouTube - Moped Suzuki K50 V-twin
    YouTube - Moped Suzuki K50 V twin


    Tags: None
  • #2
    Discussion Approved
    The Wheel was a great invention; Two Wheels with a Motor in between was even better!


    BMW Motorrad Days 2011

    Xbhp's Indo-French Kashmir-Ladakh Tour

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    • #3
      Cannot work without split crank-case as far as I have heard/learnt. Why don't you PM Rajkumar11 for his inputs?
      Kriss : 15.06.1981 - 11.10.2009
      You will not be forgotten...RIP

      Comment

      • #4
        Originally posted by gsferrari View Post
        Cannot work without split crank-case as far as I have heard/learnt. Why don't you PM Rajkumar11 for his inputs?
        Or joel,he is one of those DiY guys.
        Socha Toh Locha.

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        • #5
          i would not be able to say much. would wait for Venu's (Enginehacker) input on this one. i am sure after the sucess of his Fiero Vtwin he would want to help on this one aswell
          |NO WHEELS|

          Comment

          • #6
            Off-hand this could posibly have some sort of a disc-valve arrangement (the kind seen in the KB100) though a common crankcase would create issues with the intake as the 'pumping' efficiency of the crank-case would suffer. Conjecture all the way actually.

            The disc-valve impression is re-enforced seeing the placement of the carb and the 'throttle butterflies' inside the intake horn are downright funny. So is its 'reverse diffuser' design. One doesn't increase the flow velocity of intake air. The target is to reduce it so as to increase local air pressure around the intake.

            The low 'transfer' efficiency (if the crankpins are off-set by 90 deg to make it a true v-twin) I guess would make it an engine thats difficult to run at idle or low rpm's. No wonder the idling seems to have been set pretty high as seen in the video. And I also feel that an engine can live with such design inefficiency only for small displacements. Go higher and the fatal flaws get pronounced in effect exponentially.

            PS: Devilsh conjecture this: maybe the second cylinder is a dummy!!
            I don't let my motorcycles interfere with my motorcycling...

            Join xBhp On

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            • #7
              Originally posted by Old Fox View Post
              PS: Devilsh conjecture this: maybe the second cylinder is a dummy!!
              Just evil
              Kriss : 15.06.1981 - 11.10.2009
              You will not be forgotten...RIP

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              • #8
                Such a v-twin 2-stroke sharing the same crankcase will never make enough power to justify the effort put. The 2nd cylinder could very well be considered a dummy, if the intention was only to make a working 2-stroke v-twin and not a performing one.
                sigpic
                [email protected]

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                • #9
                  Yes, this is a single crank pin and single crank chamber design. It has a very poor efficiency compared to a seperate crank case chamber design. This effort seems more of an academic one rather than one of function. Also this design would only last on small displacement engines and that too only with a narrow angle V. The cylinder seem to be splayed by about 60 degrees.

                  Comment

                  • #10
                    Thnx all for sharing views.

                    It appeared something much interesting as i didn't know any such trials done even for demo sake. Couldn't locate any similar over the 'net too. Separate cases or forced induction is preferred allover.

                    I learn that though possible to run such configuration it is not worth the effort in terms of output. I might sound stupid but lets pls consider this as a topic of academic interest. hope we can discuss possibly a few options (if any) which may improvise the setup to keep it atleast good as original single. And I would like to try deriving engine character from these.

                    Big Q: Would this second cyl possibly become parasitic load?

                    I presume that lower case pumping is suffered mostly by front cylinder taking that engine spins clockwise viewed from RH / carb side. it gets less gas. Can this be countered by a tighter combustion chamber?
                    And yes the angle seems 60 deg from pic.
                    Last edited by rennjie; 11-06-2009, 12:25 AM.

                    Comment

                    • #11
                      Since you guys are talking about making a V Twin engine outta two smaller engines do have a look at this.

                      YouTube - Enfield V twin 700 cc The Musket on the road
                      sigpic
                      when i ride bullet before my bullet was solid condition but i once race with a Ceilo car and my engine size. mechancic say bullet is good bike but no racing. it is good for three people and very powerful.
                      one day when i become rich i but ducati and then I race with cars. not now.
                      kamlesh kanda
                      NO PACE TOO SLOW
                      IF you're at all going to be a respectable rider one day, leave your pride at the "door."

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                      • #12
                        that enfield sounds really sweet, i wish they would sell it here
                        Four wheels move the body. Two wheels move the soul.

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                        • #13
                          Originally posted by Raoul Black View Post
                          that enfield sounds really sweet, i wish they would sell it here
                          Its not made by the company. Its made by the guy in the video. An indian settled in US. He pursued this as a college project/ Hobby kinda thing.
                          The name Musket is perfectly in legacy with the Bullet
                          sigpic
                          when i ride bullet before my bullet was solid condition but i once race with a Ceilo car and my engine size. mechancic say bullet is good bike but no racing. it is good for three people and very powerful.
                          one day when i become rich i but ducati and then I race with cars. not now.
                          kamlesh kanda
                          NO PACE TOO SLOW
                          IF you're at all going to be a respectable rider one day, leave your pride at the "door."

                          Comment

                          • #14
                            hi guys, Shall we keep discussions Topic specific? There's some similars done in our country itself but lets discuss those separate. Thnx
                            Last edited by rennjie; 11-06-2009, 04:33 PM. Reason: + dtl

                            Comment

                            • #15
                              Vintage 2s-v2

                              I know i'm at an old thread. But its a Nice topic & as with any odd tech- engg topic this too was bound to die fast All i've got now is to share a pic of this vintage 2s-v2 cycle.
                              cheers!


                              Edit:
                              Found the link : The Stanger Motorbike

                              This machine of 1920's vintage, ~600cc & shared crankcase is said not of success owing to its tech issues, which i think associates to material & manufacturing limitations of that period.
                              Last edited by dr.cr; 08-18-2011, 02:25 PM. Reason: link

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