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  1. #1

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    MVVS 120 twin boxer

    Can the cylinders exaust be turned upwards so they point the same way as the carb.
    See picture
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  2. #2
    DarZeelon's Avatar
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    RE: MVVS 120 twin boxer

    TP,


    This is an MVVS...

    All the .15-.91 displacement cylinders (this engine has .61 cylinders) can be rotated, to have the exhaust port pointing in any of four directions...
    This is best done before the engine is ever run, so new wear-patterns are established on pristine surfaces of new piston and sleeves.

    However, the carburettor probably cannot be turned 90ΒΊ, so I cannot see how you would allow it to work properly.
    Dar Zeelon - ISRAEL - ddzeelon@gmail.com
    MVVS - Jett - MS Composit - Rossi - Mejzlik

  3. #3

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    RE: MVVS 120 twin boxer

    are you saying it can not be done with this 120 engine ?

















































  4. #4
    DarZeelon's Avatar
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    RE: MVVS 120 twin boxer

    No, TP.


    Just that an extension would probably need to be fabricated, to use the Walbro carburettor on your engine...

    Its solid parts will otherwise clash with the exhaust...
    Dar Zeelon - ISRAEL - ddzeelon@gmail.com
    MVVS - Jett - MS Composit - Rossi - Mejzlik

  5. #5
    wjvail's Avatar
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    RE: MVVS 120 twin boxer

    Yes you can rotate the cylinders. I never got the carb you have installed to run properly. No mater how far I backed the needles out, I could not get it to run rich enough. Most of my problems with this engine were solved by replacing the carb. The new car does not interfere with the mufflers but the linkages is not as simple as I'd like. You will have to install the mufflers the other way around.

    One cylinder ran considerably hotter on my engine. I did some work internally to direct the fuel/air and now they run withing 5 deg of each other.

    I haven't flow this engine yet but I have run it a considerable amount on the bench. I would solicit other opinions and or run this engine on the test bench some before you build a plane around it. My engine is running very well now but it didn't come out of the box that way.

    Bill
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    "Well - Nothing bad can happen now."

  6. #6

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    RE: MVVS 120 twin boxer

    Hi!
    It can be done ...but don't lay down too much work on the MVVS 1.20 as it doesn't work too well!
    Both the 1.20 and 1.24 twin was something the MVVS would likely forget today( These engines are no longer in production).
    The twin engines doesn't run well. Ok ! They run but they cannot be run rich, don't idle too well without battery glow and don't throttle too well. Can you live with that then go ahead! But please don't use them in a scale plane.
    Jan Karlsson - Supplier MVVS Products

  7. #7

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    RE: MVVS 120 twin boxer

    hi! i'm from pr and i have this engine, but the cylinder exaust is looking upwars to the carb. this engine only ran 2 tank and in the first tank it stop radically, i have to losen the bolts to liberate the propeller. when i tighten the bolts again and the propeller losen freely i run the second tank and run very well.(i run the tanks in a bench). do i turn the cylinder exaust just 1/2 away to have the exaust like is in the first picture? and what kind of muffler are that? thank for the help. i will try to take a picture of my engine the next time.

  8. #8

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    RE: MVVS 120 twin boxer

    http://www.bissonmufflers.com
    This company makes the mufflers that were on there i believe .
    The motor was sent to my friend and the exaust was turn 90 deg facing down

  9. #9
    DarZeelon's Avatar
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    RE: MVVS 120 twin boxer


    ORIGINAL: abnerdjesus

    ...Do I turn the cylinder exhaust just 1/2 away to have the exhaust like is in the first picture?
    Abner,


    According to MVVS, one can only determine the position of the exhaust BEFORE the engine is first run...

    However, according to my own experience with MVVS, after two tanks it is still possible...

    You will need to redo the break-in... Since the piston(s) will now be at either 90ΒΊ or 180ΒΊ to its previous orientation; so the wear patterns must be reestablished.

    Dar Zeelon - ISRAEL - ddzeelon@gmail.com
    MVVS - Jett - MS Composit - Rossi - Mejzlik

  10. #10

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    RE: MVVS 120 twin boxer

    Hi Fellows
    I now need parts for this Boxer 120
    Carb # WYK41D5

    Of course all help is appreciated
    Sparky

  11. #11

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    RE: MVVS 120 twin boxer

    What carb did you end up using? And what internal mods did you do?

  12. #12
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    RE: MVVS 120 twin boxer

    Strange that MVVS never build simmilar size petrol engine twin cyl

  13. #13

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    RE: MVVS 120 twin boxer

    I have received assistance from a fellow owner of these engines, who kindly gave me some very helpful information.

    Here is mine, wearing diesel heads

    Once I sort out the gas flow into the reeds and put on a new carb (a replacment Walbro able to flow enough fuel) I will run it in with the glow heads on. If I succeed in obtaining reliable running, I will post my findings here.
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  14. #14
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    RE: MVVS 120 twin boxer

    \"Propellers are notorious for inflicting serious bodily harm while vigorously defending their space\" George Aldrich


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