The ineer diameter of the rings ?
This allows the piston 'slop' to be figured.
And to keep it simple let's say that ALL the blow-by ONLY goes through the end gap, and that everything that goes through the first goes through the second.
Actually what you have already measured is the nett blow-by after going through the 3 rings (2 compression and 1
oil). If I'd thought about it I'd have realized that sooner
