Piston Ring Alignment
Sandy Hutton
Had a bit of free time, all helicopters flying, so went on an internet search to find the definitive answer to this vexing question.
And this is what I found
Teledine Continental Engine Service Bulletin M84-15
SUPERSEDES M76-18 Rev.1
Dynamic Seal Check
(k) To check the dynamic seal of a cylinder, proceed with the leakage test and observe the pressure indication of the cylinder pressure gage. The difference between this pressure and the pressure shown by the regulator gage is the amount of leakage at the dynamic seal.
(l) If the leakage is below the previously determined low cylinder gage reading, loss past the dynamic seal may be due to piston ring end gap alignment or by the piston and piston rings angular direction in the cylinder bore see
So Mr Continental agrees with you.
Cheers
Blackhand