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Message: [QUOTE="RM_guy, post: 430885, member: 20652"] This link discussed the need for accurate honing of the cylinder wall in order to properly retain oil for lubrication of the rings. Although it refers to automotive (4 stroke) engines, the concept is transferable to 2 strokes. [url]http://www.automotiverebuilder.com/ar/ar49852.htm[/url] Here is another article that is actually better… [url]http://www.babcox.com/editorial/ar/ar90058.htm[/url] If anything these help me to understand ring seating. When the rings seat they are actually knocking off the high spots that remain after honing. It leaves a “plateau” at the peaks of the honed surface that an oil film can develop for the rings and piston to ride on. The film is replenished by the oil that is trapped in the valleys. The interesting thing is that the “plateau” can be pre-established to reduce break in time. Of course the trick is to not “plateau” it too much. Dale, There is a lot of oil in a 2 stroke engine but unless it’s getting to the right spot it really doesn’t help much. As the rings slide up and down, they are constantly scraping away and oil that may be there. If the cylinder wall was perfectly smooth, all lubrication would be lost and there would be metal to metal contact. Some oil may not be scraped off but most of it would. A properly honed cylinder leave valleys that trap oil, that can’t be scraped off, therefore maintaining the oil film. I think it’s a moot point whether it’s a 2 or 4 stroke engine. Both designs need crosshatching to retain oil for lubrication. The difference is that in a 2 stroke, the oil is part of the fuel mixture and pretty much slathers everything in oil and a 4 stroke has an oil sump that splashes oil up onto the cylinder and the oil rings catch and hold it to replenish the oil on the cylinder wall. [/QUOTE]

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