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Ring End Gap SV650

Discussion in 'Tech' started by Rising, Dec 28, 2021.

  1. Rising

    Rising Well-Known Member

    The manual just lists a service limit of 0.028. Is there a minimum gap? The new rings I have are measuring around 0.010 and I want to make sure that isn't too small. This is stock bore, pistons, rings. Gen2 if that matters.
     
  2. Rising

    Rising Well-Known Member

    The old ring in the same cylinder measures 0.011. So I would take that to mean the new ring at 0.010 is probably good?
     
  3. RM Racing

    RM Racing Tool user

    Standards for ring end gap for aluminum pistons in Nikasil are Bore x .0045" (0.0040-0.0050"), which in metric is bore x .11mm, so you should make the gap larger. 81 x .11 = 1 mm (approx), which is 0.040". It wasn't clear if you were measuring in metric or standard units.
     
  4. TWF2

    TWF2 2 heads are better than 1

    You are good. Standard is .008-.014
     
  5. regularguy

    regularguy Always Krispy

    40 thou no way. it's .0045" per inch of bore, which is .1143mm per inch of bore. 81/25.4 = 3.188 3.188x.1143 = .364mm or .0143"

    if we're running nitrous or 20 lbs of boost 40 thou sounds good!
     
    RightSideUp likes this.
  6. Rising

    Rising Well-Known Member

    Thanks guys. I should have clarified the measurement was in inches.
     

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