[Mgs] Piston ring end gaps.

Milton Olson mcolson40 at hotmail.com
Thu Jun 17 15:10:33 MDT 2010


 For what it is worth, I worked for a piston ring company in the test lab for
several years. When testing piston rings we found that the rings rotate during
opperation. This condition is normal. We used to have a set pattern for ring
gap location when installing rings on the pistons the end gaps were never in
the same spot when the engines were torn down after a test run.

The only gaps that stayed as installed were the thin rails of the three piece
oil rings, we used to position the rail gaps about 45 degrees from the
expander butt joint, one rail on one side and the other on the other side.
Because of the expander the three piece oil ring would move as a unit.

You may have noticed that the rings on two cycle engines are pinned so that
the ring does'nt rotate. The gaps are pinned in an area away from the exhaust
and intake ports. The piston rings may break if the gaps are allowed to run in
the ported area.

Hope this information is of some help to you.

Best regards,

Milton

Midget 78 in the process of being restored.

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