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      08-28-2014, 11:16 PM   #15
Silenus
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Drives: 2017 M3
Join Date: Apr 2014
Location: Bay Area, CA

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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.
That's not how we do the carbon cleaning. The walnut blasting machine has a vacuum attached to the intake port, so everything is pulled out.
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