Dusting off my old scratchbuilt engines making them run again.

Discussion in 'Photos and Videos' started by hobby, Sep 16, 2018.

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  1. Sep 16, 2018 #1

    hobby

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    I'm dusting off my old scratch built air powered engines and putting them back into running condition again.
    These engines were designed and built about a decade ago.

    I'l call this engine #1 for this video series.

    This is probably the 3rd engine I built after I got the hang of machining parts to make running engines.

    Here is a video of it running.



    and some pics:
    SUNP0001.JPG SUNP0002.JPG SUNP0003.JPG
     
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  2. Sep 17, 2018 #2

    tornitore45

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    Good plan. Most of the engine we build are run a couple of time to prove ourselves it runs an put away. I have the same plan, after finishing the current build I am going to run them all.
     
  3. Sep 18, 2018 #3

    Anatol

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    Cute engine. It seems like it has dual poppet valves on each cylinder? are they driven from 4 cams on the crankshaft, via pushrods? It w0uld be nice to see a closeup of the rockers, and a pic of the crankshaft. It looks like you could adjust the angle between the cylinders (?) Why did you settle on that angle?
     
  4. Sep 18, 2018 #4

    hobby

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    Thank you,
    Yes, I'm using 4 eccentrics to supply the cam action
    I think the angle is around 45* included, I chose it mainly for asthetics, it gives a nice Vee look to it.

    The crankshaft is built up.
    Here is the crankshaft, and the eccentrics:

    SUNP0001.JPG

    1.5.JPG

    and the rocker arm assembly:

    SUNP0006.JPG

    SUNP0007.JPG

    SUNP0008.JPG

    SUNP0009.JPG

    Here is a short video of the parts moving under manual control slowly spinning the flywheel by hand.



    ............................................................
     
  5. Sep 18, 2018 #5

    hobby

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    Thank you,
    yeh it needed a lot of dusting off, but after a good cleaning and some machine oil the old engine runs like new again.
     
  6. Sep 18, 2018 #6

    Anatol

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    Thanks for the new pics and video - very nice!
     
  7. Sep 18, 2018 #7

    olympic

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    A nice, unusual engine. Good work!
     
  8. Sep 18, 2018 #8

    Jmccrack

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    Very nice. Where did you get the plans for this one?
     
  9. Sep 19, 2018 #9

    hobby

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    Thank you!
     
  10. Sep 19, 2018 #10

    hobby

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    Hi, thank you!
    I didn't have any plans for it, it's scratch built, I was designing it as I was building it.
     
  11. Sep 19, 2018 #11

    Jmccrack

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    Nice job
     
  12. Sep 19, 2018 #12

    hobby

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    Thank you.

    When you mentioned plans, I didn't have any plans from another source, but I did draw up my own plans, as I was building it. After you mentioned about plans for this, I looked through my cad files to see if I could find them for this engine, and I found them.

    If you want I could load them into this thread, However a word of caution (I cannot guarantee any accuracy on the dimensions or even the drawings, as my method involves deviating away from my plans as needed, and most of the time I don't bother updating the plans to reflect the changes, some of the drawings are just conceptual dimensions, all thrown together to get me in some direction for machining the parts.)

    However if your interested in looking over them to see what is feesable and whats not, your most welcome to have them, let me know and I'll upload them into this thread.
     
  13. Sep 19, 2018 #13

    Jmccrack

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    That would be fantastic. I love the sound. If you have any notes on the build I could email you as well.
     
  14. Sep 20, 2018 #14

    hobby

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    Hi, I would like to keep everything on the forum here,
    however before I upload any of the plans for this, here are some more pics.

    These are areas on the engine that I have no dimensions or any design notes on
    placement of these parts, they were all done through trial and error.

    Here is an example of problem solving, that needs to be done.

    the push rod tubes need to be as parrallel as posible on the eccentrics on the crankshaft,
    but need to exit through the top cover of the engine at an angle so as to end up in the
    right place to meet with the rocker arms, it requires taking measurements to know
    what compound angle you need, than making a jig to hold the push rod bracket
    at a compound angle to drill through.

    here the tubes (push rods) are sitting very close to parallel to each other as possible.
    SUNP0001.JPG

    exiting the top cover they end up at an angle to each other.
    SUNP0002.JPG

    full view
    SUNP0003.JPG

    front view
    SUNP0004.JPG

    coming back the other side
    SUNP0005.JPG

    SUNP0006.JPG

    the angles arrangement of one of the cylinders
    SUNP0007.JPG

    SUNP0008.JPG

    As you can see there is a lot of things that you need to figure out on your own, that
    I just don't have any dimensions or design steps to show, it all has to be built by
    your own instincts of problem solving in mechanical design.


    I'll still upload the plans, I drew up, in the next few days, but again the drawings are more conceptual thoughts
    than actual build dimensions, on most of the areas.

    If anything, the whole upload would be a good way to get the idea of the build of this engine, but I wouldn't
    machine any parts according to the plans, until each part dimension is thoroughly looked over.


    Please understand
    I'm not trying to discourage you, but I am alerting to you, these plans are not plans I would put out for the forum to build off of, because they were done through trial and error, and this engine is built on ones own ability to do problem solving.


    I'll upload the plans next time.
     
  15. Sep 20, 2018 #15

    hobby

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    Please do not trust these plans, they were done on the fly, check and recheck all dimensions
    before committing to machining any parts on these plans.

    These plans are not uploaded to be used in a build for the forum, if you do you
    are under your own discretion to use them for a project build.



    cylinder page1.jpg

    cylinder page2.jpg

    cylinder page3.JPG

    valve bracket.JPG


    intake manifold.JPG


    cylinder head.JPG



    intake valve.JPG


    exhaust valve.JPG


    spring retainers.JPG




    piston.JPG
     
    Last edited: Sep 20, 2018
  16. Sep 20, 2018 #16

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    con rod.JPG


    rocker arm brkts..JPG


    crankshaft page1.JPG




    crankshaft page2.JPG



    crankshaft support page1.JPG



    crankshaft support page2.JPG



    end panels.JPG


    top panels.JPG




    cylinder clamps page 1.JPG
     
    Last edited: Sep 20, 2018
  17. Sep 20, 2018 #17

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    cylinder clamps page 2.JPG


    eccentrics.JPG

    lift rod guides.JPG



    rocker arm.JPG


    flywheel.JPG



    throttle.JPG





    cylinde-valve-piston assembly.JPG



    The rest are a bunch of drawings scattered, that I collected, these are just
    conceptual ideas, and work arounds trying to figure out angles and placement of components and such.


    design concepts page   1.JPG
     
  18. Sep 20, 2018 #18

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    design concepts page   2.JPG


    design concepts page  3.JPG


    design concepts page  4.JPG


    6.JPG


    7.JPG


    8.JPG


    9.JPG


    10.JPG



    11.JPG


    12.JPG


    If I find any more I'll upload them.
     
    Last edited: Sep 20, 2018
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  19. Sep 20, 2018 #19

    minh-thanh

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    The way you do it is the same way I did with my engine !
     
  20. Sep 21, 2018 #20

    hobby

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    I don't think I could design engines to the degree I made them, without my CAD programs.
    Yet there are people on this forum, who still use drafting boards to do there designs,
    To me that is amazing, my hats off, to those who can design mechanical engines without
    CAD programs, it must take years of experience and know how to pull that off.
     
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