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  1. #1
    jdog800's Avatar
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    Gas ported pistons

    Have any of you guys tried gas porting the pistons?
    I was thinking about trying this, but I wanted to get some feedback first.


  2. #2

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    Cool

    I thought about it but think in short time hole would fill in and throw ring pressure out of balance ,the top ring are cut at angle so that is your gas sealing
    later cd
    Last edited by chip; 07-10-2008 at 06:42 PM.

  3. #3
    Moderator RX951's Avatar
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    Is piston porting, like piston "windows" ?



  4. #4
    jdog800's Avatar
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    Those pistons are for a piston induction motor....but yea the principle is the same. I was discussing this earlyer in which I use additional piston port induction to draw more intake as well as pushing cold fuel mixture under the crown. This is somewhat what I did to mine just not as big
    I also champher the ports upwards so that the charge is forced upwards rather than downwards which most piston port induction motors use.
    Last edited by jdog800; 07-11-2008 at 06:05 PM.

  5. #5
    Moderator RX951's Avatar
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    Quote Originally Posted by jdog800 View Post
    Those pistons are for a piston induction motor....but yea the principle is the same. I was descussing this earlyer in which I use additional piston port induction to draw more intake as well as pushing cold fuel mixture under the crown. This is somewhat what I did to mine just not as big

    cool ! how's your raider been running? The vintage class missed at the bug this year.

  6. #6
    jdog800's Avatar
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    gas ported piston is where you drill small holes threw the crown to force explosion gases behind the rings to force them against the cylinder wall. like these
    Attached Images Attached Images  

  7. #7
    Moderator RX951's Avatar
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    sweet ! I swear I learn something new everyday. I'll have to read up on this. is this new technology for two strokes? or old skool revisited?

  8. #8
    jdog800's Avatar
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    Raider is still undergoing more engine modification.....Im trying to see what the limits are to the motor then Im moving to the hull.
    I missed the bug because of the whole fathers day confliction ..
    but mabey next year.

  9. #9
    jdog800's Avatar
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    way old school

  10. #10
    jdog800's Avatar
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    heres a pic of some earlyer pistons I did.....I have since moved to a larger longer hole.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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