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      08-28-2014, 06:25 AM   #11
pattielipp
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Drives: '08 135i & MR-S
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Quote:
Originally Posted by flinchy View Post
logical analogy, but if the carbon was chipped off by hand and not extracted, it would be spat out through the exhaust after a couple of revs tops, it shouldn't be anywhere near large enough a chunk to damage a valve either.

still, definitely better off removing it properly anyway.
I don't think it would be so much of damaging a valve as to Scaring the cylinder walls. Carbon is hard stuff and if it gets stuck between the side wall and the piston, above the piston rings, it could cause a few nice scrapes before being spat out. Who the hell knows the potential(although unlikely) for any damage in the turbine and/or CAT.

With all of that said, I see this is similar to Meth injection in the sense of adding a foreign liquid(even if atomized) into the intake tract and potentially loosening/softening up these carbon deposits.

But what do I know.. I'm still learning this platform.
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