boxer engine

Discussion in 'A Work In Progress' started by sbdtasos, Dec 4, 2017.

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  1. Feb 16, 2018 #21

    sbdtasos

    sbdtasos

    sbdtasos

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    camshaft lobe ready
    valve lifters shims
    brass fitting on cam holders :)

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  2. Feb 18, 2018 #22

    sbdtasos

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    pistons and pins ready :)

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  3. Feb 19, 2018 #23

    vederstein

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    Must do dumb things....

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    ...the wonders of CNC....
     
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  4. Feb 21, 2018 #24

    sbdtasos

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    crank ready :)

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  5. Mar 4, 2018 #25

    sbdtasos

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    and we are very close :)

    IMG_20180304_140252.jpg

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  6. Mar 4, 2018 #26

    michael-au

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    Looks fantastic nice work
     
  7. Mar 5, 2018 #27

    michelko

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    Hi
    whats the yellow hose for? Looks like it´s going from the head to the carb?

    Michael
     
  8. Mar 5, 2018 #28

    sbdtasos

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    here is the correct possition for the yellow hose :)

    IMG_20180305_224457.jpg

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  9. Mar 11, 2018 #29

    sbdtasos

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    and we have the first failure .the bearing of the conecting rod is broken
    i change it and try to start the engine again and the bearing again broke.i dont know the reason.now i have install brass bushes and i will see the results

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  10. Mar 12, 2018 #30

    michael-au

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    Hope you get it sorted out, will be good to see it running
     
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  11. Mar 13, 2018 #31

    ninefinger

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    My initial gut feel is that the ball bearing is undersized for the load. Looking at full size applications - 2 stroke boat motors for one - I've seen needle roller bearings on the connecting rod big end. Even in modern car engines they are using babbit bearings as the load is quite high at this location in the engine. I think you will find your brass bushes will serve well in this application.
    Looking good - excited to see it run.

    Good luck.
    Mike
     
  12. Mar 13, 2018 #32

    michelko

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    I agree with Mike. The bearing balls Look realy tiny.
    Michael
     
  13. Mar 13, 2018 #33

    Mechanicboy

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    Mike, i am car mechanic and can tell you the babbit bearings is not longer in use in the modern car engines. Also we are using aluminium bearing alloys. The aluminium alloy bearing have wear resistance, high load-carrying capacity, fatigue strength, thermal conductivity, and excellent corrosion resistance, and low cost. The aluminium alloy bearing last long life up to 300 000 km to 400 000 km before the bearing is worned. The world's highest mileage car, a 1966 Volvo P1800, has traveled more than 4,828,032 km (3,000,000 mi) on its original B18 engine.
     
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  14. Mar 13, 2018 #34

    Mechanicboy

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  15. Mar 13, 2018 #35

    sbdtasos

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    in all my engines i use bearings 6x10x3 on the rods with no faulier
    on this engine i use bearing 8x12x3,5 and i have this problems
    now i think that will be ok with the brass bushes
    now i trying to start the engine but i have some issues
    as you will se on video the engine start but stop after 2-3 seconds
    when i close the carb with my finger the engine start but only for 2 - 3 seconds after is not starting
    i check the timming and i want everybodys opinion for that
    my camshaft timing at 40 before tdc and close 30 after bdc for the intake
    and for the exhaust 30 before bdc and 40 after tdc
    i check my camshaft and i want your opinions for my timminig if is ok or not
    cylinder 1 in -30 btdc +40 atdc
    ex -30 bbdc+30 abdc
    cylinder 2 in -25 btdc+45 atdc
    ex -35 bbdc +45 abdc
    cylinder 3 in -40 btdc+35 atdc
    ex -30 bbdc+35 abdc
    cylinder 4 in -40 btdc+30 atdc
    ex -30 bbdc+40 abdc
    do you thing that this timinig is a problem?


    [ame]https://www.youtube.com/watch?v=js5OguG-bLs&feature=youtu.be[/ame]
     
  16. Mar 16, 2018 #36

    ninefinger

    ninefinger

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    What is your ignition timing like? And what do you have for a flywheel? Sounds like it might be either to aggressive ignition and/or too little flywheel to keep it going.
     
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  17. Mar 16, 2018 #37

    ninefinger

    ninefinger

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    I use babbit bearings as a general description for hydrodynamic bearings of that type, not meant to imply the actual construction of the bearing itself.
    Basically an oil film bearing has a much higher load capacity than a ball bearing of the same outer / inner diameter and width.

    Mike
     
  18. Mar 16, 2018 #38

    sbdtasos

    sbdtasos

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    90% ignition have problem
    yes i know that engine looks like that have to much ignition timing
    but is only 25 degrees btdc
    i am waiting a new ignition and i will try again to start the engine
     
  19. Mar 17, 2018 #39

    pp2076

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    Fake Chinese bearings perhaps?
     
  20. Mar 18, 2018 #40

    sbdtasos

    sbdtasos

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    yes correct :)
     

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