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Old 04-20-2013, 09:20 PM   #17 (permalink)
Master EcoModder
Join Date: Jul 2008
Location: NY state
Posts: 492

XJ Cherokee - '00 Jeep Cherokee Sport
90 day: 12.96 mpg (US)

FoFO - '11 Ford Focus SE
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Originally Posted by some_other_dave View Post
The current-generation MINI Cooper S models have a well-known problem with carbon deposits in the intake ports and on the intake valves. Walnut shell blasting is used to remove the deposits when they get bad enough.

Fuel dilution, however, has not been a problem that I have heard of.

Fitting an oil catch can and re-routing the PCV system to it has been used as a way to avoid the problem. I don't know if it is a complete solution, though.

Most of the crap that gets stuck on the intake valves is a result of the PCV system.

I wonder if we'll see the water / steam based de-carboning come back? I'd be afraid of a piece of carbon scratching the cylinder wall or getting stuck on a ring or something.


Glad neither of my engines has DI!
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