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Old Mar 04, 2012, 01:26 PM
Jam1e is offline
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Worcestershire, England
Joined Nov 2007
481 Posts
Originally Posted by AndyOne View Post
When running a tuned pipe some of the burnt fuel is forced back into the cylinder just before the exhaust port closes due to a high pressure pulse. This recirculation of burnt fuel causes it to be burnt even more on the next firing stroke. The result is black exhaust oil, it's just an artifact of using a pipe and nothing to worry about if there's no sparkly bits in it.
Thanks for the replies folks.
I'm inclined to "run" with the reply from "AndyOne"
Thanks all
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