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.
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?
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.
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!