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To: eastexsteve

Most of what you said is wrong.

“The cross hatch hone pattern originally installed in the cylinder walls wears away during engine break-in when the rings seat. It does not exist to make the rings “spin” around the piston.”

Nope, Cross hatch is visible even after 100k miles in modern engines. The cross hatch is what holds the oil in the cylinder walls.

“It does not exist to make the rings “spin” around the piston.”

Also answered in post 68. Piston ring rotation has actually been measured.
“It is clear that whatever position the rings are in during the engine build will not be maintained during service.”
https://www.highpowermedia.com/Archive/rotation-of-piston-rings

“That is only one reason.”

That is THE ONLY reason;
“The locating pin’s job is to keep the end of the ring from moving so that it does not end up in an opening or a port hole,” explains Dave Sulecki, Global Powersports Product Manager for Wiseco. “If it did that, then it would cause engine failure. Anybody who has seen a blown-up two-stroke engine knows what I’m talking about.”

“Unlike 4-strokes, 2-stroke cylinders have ports in the cylinder wall. If the ring end gap were to pass over one of these, it would allow for expansion, collision with the edges, and failure-causing damage.”
https://blog.wiseco.com/2-stroke-locating-pin


77 posted on 01/20/2022 6:49:29 AM PST by dynoman (Objectivity is the essence of intelligence. - Marilyn vos Savant)
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To: dynoman
Nope, Cross hatch is visible even after 100k miles in modern engines. The cross hatch is what holds the oil in the cylinder walls.

If you are holing oil in the cylinder walls on compression stroke, your rings are failing (particularly your oil wiper rings) and you are burning oil. The only places the hone pattern is visible in the cylinder after an engine has completely broken in and the rings have seated will be at the very top ridge of the cylinder above where the compression ring travels, and at the bottom below where the oil rings travel on the areas where the piston skirt doesn't touch.

86 posted on 01/20/2022 7:46:54 AM PST by eastexsteve
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To: dynoman
Nope, Cross hatch is visible even after 100k miles in modern engines. The cross hatch is what holds the oil in the cylinder walls.

See any cross hatch in this cylinder? Want more pictures? http://i305.photobucket.com/albums/nn213/Disher04/DSC00091.jpg

87 posted on 01/20/2022 8:00:35 AM PST by eastexsteve
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