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[QUOTE="adam728, post: 1131668, member: 55463"]
Ideally yes, but this is the real world, where things wear, and where brand new bearings do not have perfect surfaces and do in fact break in. Now, if you don't change the bearings then there is no break in. But new bearings are tighter than ones that have been run in.

As for heating/cooling, it is fairly important even with an old cylinder. Up to 80% of the heat carried away from the piston is handled by the rings. New rings that are not yet seated have a smaller surface area in contact with the cylinder walls, meaning they can't transfer heat nearly as well. Now, that doesn't mean you are going to overheat and melt the piston crown. But it does mean things are running at higher than "normal" temperatures.  We regularly see spark pleg temperatures drop 20-30 degrees after a good hour or so of break in. Hp will also come up 5-10%, sometimes more if the engine was very tight when new (which more than likely meant out of spec components).
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