Piston rings
Piston rings
(OP)
The "ceramic engines" thread mentioned piston rings and gave me a question to ask. The rings on a typical 4 stroke IC engine are not keyed and thus do move around. However, the rings on my SeaDoo jetski (2 stroke) are keyed presumably to prevent this. Being an EE I don't follow the reasoning of either, as it seems not to be very important if its done both ways. Comments?
Life is what happens while we're making other plans.
Wally





RE: Piston rings
RE: Piston rings
With 4-strokes, the rings are allowed to rotate freely. This arrangement allows a random, and thus uniform, wear pattern between the rings and cylinder bore, and maximizes ring life. A ring that is free to rotate in its groove is, by far, the preferable arrangement.
Regards,
Terry
RE: Piston rings
Thanks to both for expanding my knowledge base!
Life is what happens while we're making other plans.
Wally