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  1. #26
    3136's Avatar
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    RE: NGH 38CC 4 stroke

    Balsa USA brother #1
    Top Flight brother #08
    Sig brother 104
    Cub brother #206

    Mark

  2. #27

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    RE: NGH 38CC 4 stroke

    Some pictures of engine:

    Exhaust valve guide. It seems bronze. Picture taken with a USB microscope through exhaust mainfold. Well lubricated !!!!

    The connecting rod with needle bearings on both sides, and centered on the piston pin with two spacers.
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  3. #28

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    RE: NGH 38CC 4 stroke

    LOOK'in Good! Would like to see some more prop data. Very Interesting

  4. #29
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    RE: NGH 38CC 4 stroke

    Well, I just ordered one from Norway
    http://www.throttlestore.com/engines...e.aspx?lang=EN

    As it has to go through customs, i expect it to take some time before I will get it in my hands...


    At least there are a few more videos out now.

    "Xoar 19x8 prop
    Idles smooth at 17-1800 rpm and full throttle with these propellers at max 6230RPM"
    http://www.youtube.com/watch?v=jgsMz...eature=related


    and this one:
    http://www.youtube.com/watch?v=gfiSpIg8pz0
    Sonnich Johannesen

  5. #30
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    RE: NGH 38CC 4 stroke

    NGH says new party will be available on sale mid december .
    GlowHead Brotherhood #31

  6. #31

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    RE: NGH 38CC 4 stroke

    Thanks for the photos. The rod & all the inside,s look very well built. Capt.n
    I never met a engine I did not like !

  7. #32

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    RE: NGH 38CC 4 stroke

    ORIGINAL: captinjohn

    Thanks for the photos.Β* The rod & all the inside,s look very well built.Β* Capt.n
    All engine parts look very well built. Also i've received some technical explanations from Michael about lubrication inside the engine parts, the reason to mount two piston rings, the pressure system to the walbro carb...... Very interesting.
    I really think NGH is improving the quality of their creations.
    The only thing i don't like is the 90 degrees spark plug cap. I've replaced it by a 120 degrees CM6 spark plug cap and boot similar to mounted on new DLE35RA ignitions. Much better fit.
    Now i'm searching a nice airframe to mount this little jewel on front and see how it performs in the air.

    Best regards, captinjohn

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  8. #33

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    RE: NGH 38CC 4 stroke

    mpascual, that is a better anglefor the sparkplug lead with the 120 degree angle. I see 2 lines from crankcase too intake manifold? Just curious to what does what ! Thanks Capt,n
    I never met a engine I did not like !

  9. #34
    Turk1's Avatar
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    RE: NGH 38CC 4 stroke

    Hola amigo, did you adjust/test  dynamic timing too?I mean adjusting ignition timing to achieve max RPM. during WOT run.
    GlowHead Brotherhood #31

  10. #35
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    RE: NGH 38CC 4 stroke

    Mine arrived today......very nice

    Took a few pics for size comparisson with a magnum/ASP 180, os 120, and YS 120.
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    Sonnich Johannesen

  11. #36

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    RE: NGH 38CC 4 stroke

    I always verify/adjust the timing with a timinig wheel. In this case was OK from factory.
    I will try with different ignition 'curves' but i suspect (as with many others engines) , the standard A01-A2 retarding curve from RCEXL is the best compromise.


    Best regards

  12. #37
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    RE: NGH 38CC 4 stroke

    Opened up my engine to inspect it, and all looks good.
    The valve springs seem a little weak, and will probably limit the RPM of this engine......but that is just my guess...
    8000 is the max reccomended stated in th emanaul anyway...
    The engine is timmed at 6/12 o`clock.

    But, the valve clearance is no good from the factory....or the lack of it.
    Both my lifters where pressing slightly on the valves, where there should be slack/clearance.

    So I took my saito feleer gauge, which I think is at 0.10mm and set the valves to that.
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    Sonnich Johannesen

  13. #38

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    RE: NGH 38CC 4 stroke


    ORIGINAL: SJN

    Opened up my engine to inspect it, and all looks good.
    The valve springs seem a little weak, and will probably limit the RPM of this engine......but that is just my guess...
    8000 is the max reccomended stated in th emanaul anyway...
    The engine is timmed at 6/12 o`clock.

    But, the valve clearance is no good from the factory....or the lack of it.
    Both my lifters where pressing slightly on the valves, where there should be slack/clearance.

    So I took my saito feleer gauge, which I think is at 0.10mm and set the valves to that.

    Be careful with valve clearance.
    On engines like this one I always set valve clearance close to zero (no clearance) but avoiding pressing the valves, when engine is cold.

    Best regards

  14. #39
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    RE: NGH 38CC 4 stroke

    Setting the valve clearance to zero seems like a very bad idea to me.

    How mch have you run your engine ?
    Sonnich Johannesen

  15. #40

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    RE: NGH 38CC 4 stroke

    ORIGINAL: SJN

    Setting the valve clearance to zero seems like a very bad idea to me.

    How mch have you run your engine ?
    Ok. Set your valve clearance at your preference.
    Check the clearance when engine is very hot and after a full tank, and then let me know the clearance. Then maybe you will change your opinion.
    In a gasoline four-stroke cylinder the expansion of cylinder and head is greater than the valve rod pushers. I've learning this lesson servicing Saito gas engines, and always i set clearace close to zero.
    Also i've received a tech note from the manufacturer with this recommendation
    Best regards


  16. #41

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    RE: NGH 38CC 4 stroke

    From Saito gas engine user manual (2012 version)
    .....
    In that position, adjust with the included gauge and
    hexagonal wrench so the tappet gap may be set to
    almost zero
    when the engine is in the compression
    stroke. If the gauge can enter a limit gauge with a 0.1
    mm thickness, the clearance is at maximum and needs
    adjustment. Adjust between 0.03 and 0.10mm (0.002
    to 0.04 in.) After the gap is checked, tighten the locknut
    securely. Do not over-tighten.
    The tappet gap is the most important factor in the
    maintenance of 4-stroke engines, and operation with
    an excess clearance will degrade performance. In
    particular, a large gap aggravates abrasion of the tappet
    and the cam and also increases the unusual sound.
    ....

    Maybe this info is a very bad idea .......


    Best regards

  17. #42

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    RE: NGH 38CC 4 stroke


    ORIGINAL: captinjohn

    mpascual, that is a better angleΒ*for the sparkplug lead with the 120 degree angle. I see 2 lines from crankcase too intake manifold?Β* Just curious to what does what !Β* ThanksΒ*Β* Capt,n
    One is to give pressure pulses from crankcase to the carb.
    The second one is to release high pressure inside the crankcase when the piston is going down, to the intake mainfold, and also to get oil-petrol from intake for con-rod lubrication when piston is going up.
    On this engine the amount of oil passing through the piston ring gap is lower than other engines because it mounts two rings
    Best regards


  18. #43

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    RE: NGH 38CC 4 stroke

    Question...why is 2 rings used? Seems like 1 piston ring like a Frank Bowman ring would be fine with less friction. Also that oil needs to be in bottom end for lubrication of the rod bearings.Best Regards,Capt,n
    I never met a engine I did not like !

  19. #44
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    RE: NGH 38CC 4 stroke

    I think you are mis-reading the saito manaul.

    It says that the clearance must be within 0.03 and 0.10mm


    "
    In that position, adjust with the included gauge and
    hexagonal wrench so the tappet gap may be set to
    almost zero when the engine is in the compression
    "

    With a gauge in between the valve and tappet the gap may be set to almost zero.
    Not without a feeler gauge....


    But you are right that 0.10 is probably too much, as it is at the maximum of the reccomended gap.
    I will adjust it to 0.03mm
    Sonnich Johannesen

  20. #45

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    RE: NGH 38CC 4 stroke


    ORIGINAL: SJN

    I think you are mis-reading the saito manaul.

    It says that the clearance must be within 0.03 and 0.10mm


    ''
    In that position, adjust with the included gauge and
    hexagonal wrench so the tappet gap may be set to
    almost zero when the engine is in the compression
    ''

    With a gauge in between the valve and tappet the gap may be set to almost zero.
    Not without a feeler gauge....


    But you are right that 0.10 is probably too much, as it is at the maximum of the reccomended gap.
    I will adjust it to 0.03mm
    NGH says between 0,03 and 0,08.
    When i set the clearance on gas engines, like SAITO, and this one NGH i set the clearance to almost zero without the feeler gauge. But i'm sure the valves are fully closed.
    I only use the 0.03 feeler gauge from the OS 4S toolkit when i adjust glow engines.
    Best regards

  21. #46

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    RE: NGH 38CC 4 stroke


    ORIGINAL: SJN

    Setting the valve clearance to zero seems like a very bad idea to me.

    How mch have you run your engine ?
    It depends on the engine. Some engines the valve tappet clearance will grow bigger as it heats up. For example...the old Harley Davison 74 cubic inch engine had only a .001 inch >>one thousands clearance COLD. That grew quite a bit when temp was up on the engine. Capt,n
    I never met a engine I did not like !

  22. #47
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    RE: NGH 38CC 4 stroke

    Well, I took the first step. I just bought one. I will let you know when it gets here.
    If its not a warbird, Its just a target.

  23. #48

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    RE: NGH 38CC 4 stroke

    I too have one on order out of canada, should be here any day, can't wait!

    Mark.

  24. #49
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    RE: NGH 38CC 4 stroke

    Have you guys tried to install the included stand-off`s ?
    3 of them install fine, but the fourth one fouls on the carb bolt, and cant be installed. [&:]


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    Sonnich Johannesen

  25. #50
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    RE: NGH 38CC 4 stroke

    could you grind enough off of that carb bolt to make it fit?


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