piston rings

Discussion in '2-Stroke Engines' started by savant, Dec 15, 2015.

  1. savant

    savant New Member

    can i run my bike on one ring 66 cc
     

  2. butre

    butre Well-Known Member

    you mean with one ring? one ring is fine if it's the top ring. you can leave the bottom groove unpopulated.
     
  3. jaguar

    jaguar Well-Known Member

    one ring only will lower compression and therefore lower power.
     
  4. butre

    butre Well-Known Member

    if the ring is in spec it won't, but then again I haven't seen many rings that were in spec.
     
  5. butre

    butre Well-Known Member

    It's a bit of a double edged sword. you might lower compression, but you'll reduce reciprocating mass and friction as well.

    how do I edit my posts with the new forum software?
     
  6. jaguar

    jaguar Well-Known Member

    When I measured the end gap of new rings in a new cylinder they were 3 times the allowable gap!
     
  7. butre

    butre Well-Known Member

    the general rule I've always gone by (and what several manufacturers recommend) is 4 thou per inch of bore, meaning .0074 is just about ideal. I've not seen any over 12 thou., and sure haven't seen any over 20 thou
     
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