Quote:
Originally Posted by Stealthee
Just because an engine is torn down, doesn't mean it was in need of major maintenance. I tore down the engine in my Stealth, just cause. I had everything else ripped out of the bay and figured I would regasket the engine while it was out. The cylinder walls were perfect, compression was normal, yet there was a large amount of carbon on the valves and piston tops.
A lot of manufacturers make their cars run a little rich as a failsafe, that rich condition is going to cause carbon. I have seen many other engines torn down to be built, not because they broke, and almost all had the layer of carbon on the pistons and valves.
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Ok, your engine runs rich. It better. It is a real stretch of the imagination to think your engine is burning a mixture anything like that of a 2002 Camry 2AZ-FE, or any engine built for economy or reliability. I don't believe you will find any
meaningful carbon deposits in the cc of a 2AZ-FE that is torn down for the hell of it. For that matter, some engines run normally with a lot of blow-by. Those don't count. They will always have carbon, even with 10k miles on them.