Quote:
Originally Posted by Brian R.
Don't ignore the fact that the engines you are talking about were in need of major maintenance. To me, that means that it was not running right in the first place and probably not driven normally. I was referring to engines which are operating normally. There is no reason for carbon to build up in the cc when the fuel/air ratio is tightly controlled by a fuel injection system. Burning oil and excessive blow-by can cause this, but it is not a normal engine if it has these problems.
If you have carbon build-up in a fuel-injected engine, removing the carbon is the least of your worries.
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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.