Silicone/sealant- gaskets?

Discussion in 'General Questions' started by Neufcruz, Feb 22, 2016.

  1. Neufcruz

    Neufcruz Member

    Just installed my windowed piston and have a few questions regarding gaskets/ silicone etc.
    Do I put any silicone etc... Between jug and engine case? There was none when I took apart and gasket was in perfect condition. Also, between head and jug???
    What type should I buy/use?
    Have torque specs somewhere on here.
    Thanks

    Mike
     

  2. butre

    butre Well-Known Member

    doesn't need any of that stuff. just use the gaskets.
     
  3. Neufcruz

    Neufcruz Member

    I used the base gasket but removed the "metal" one and used Teflon as recommended on here. Is that ok or should I remove head and put back the original metal one?
    Thanks
    Mike
     
  4. 45u

    45u Active Member

    If the gasket surfaces are in good shape use just the gasket. If you ever have to use sealer make sure you use one that is not affected by gas and gas will eat up silicone quick!
     
  5. butre

    butre Well-Known Member

    teflon is good. teflon is still a gasket. just don't need any silicone goop
     
  6. 45u

    45u Active Member

    I prefer the copper gaskets as you can anneal them and use them over and over.
     
  7. butre

    butre Well-Known Member

    teflon for head, copper for everything else
     
  8. 45u

    45u Active Member

    Been using copper head gaskets on motors for over 45 years. Some on 120CI Harley motors.
    Have you checked to see your head and cylinder gasket surface are flat?
     
  9. 45u

    45u Active Member

    Torque 8mm to 120 to 175 INCH POUNDS
    Torque 6mm to 60-70 INCH POUNDS
     
  10. Neufcruz

    Neufcruz Member

    Thanks
     
  11. butre

    butre Well-Known Member

    copper is good on 4 strokes where you have to be concerned about valve clearance, but on a 2 stroke where that's not an issue I like teflon because it compresses to a hair under 1 thou
     
  12. 45u

    45u Active Member

    Now on my 1/5 scale motors do not have per-say a head as the head is made on to the cylinder so I only use copper at the base there as I have had trouble with any other gaskets. Even thaw these engines turn WAY more RPM and MUCH more HP then these motor bike engines. Then on most of the motorcycle 2 cycle motors I have built most of them have copper head gaskets and turn WAY more RPM and more HP then these little motors. All so making sure the head and cylinder gasket surface is flat helps a lot. Thanks all for the input and for the fun of it I will try all 3 types of gaskets as my motor kit should be here today and I plain on taking the top end off before I install it to check things out.
    Thanks
    Jeff
     
  13. 45u

    45u Active Member

    These are not high HP but for 30cc they turn over 10K and put out 4 to5 HP or more. Some say they get these little engines to put out as much as 7HP or 8HP. I built these to try out different engines. I all so have one in my RC buggy. Been building motors including but not limited to doing all machine work for 45 or better years much of the time as a living. I have my own little machine shop.
    Thanks
    Jeff

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