Carbon Build Up...Sell It?
#71
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Location: Kanata, Ontario
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#72
What about the 3.0 FTSI
An earlier post mentioned that there have been few reports of carbon build up with the 3.0T. I'm actually interested in the SQ5 with the 3.0 FTSI engine. Search isn't working for me on my iPad, so I'm asking about it here. Has the 3.0T been around long enough to have the problem? And what's known about the 3.0 FTSI? I'll be doing a lot of city driving, I don't hotrod my cars and I do keep them longer than most folks here probably do from what I've read.
Last edited by sq5wantabe; 03-29-2013 at 10:19 PM.
#73
AudiWorld Member
The 3.0TFSI has been around long enough in other models and you'll probably find the information you want in the AW dedicated 3.0TFSI forum
Good Luck
#74
I just read this article about reimbursing CVT transmission Audi 2002-2006 and wish the same happens with that carbon build-up issue. here is the link:
http://www.autoblog.com/2013/03/25/a...6-a4-failures/
http://www.autoblog.com/2013/03/25/a...6-a4-failures/
#75
I just read this article about reimbursing CVT transmission Audi 2002-2006 and wish the same happens with that carbon build-up issue. here is the link:
http://www.autoblog.com/2013/03/25/a...6-a4-failures/
http://www.autoblog.com/2013/03/25/a...6-a4-failures/
#76
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A U.S. patent application filed in 2002 by Volkswagen AG explains the DI-engine carbon-deposit dilemma this way: “Gasoline engines with direct injection of the fuel into the combustion chamber…suffer especially from the problem of the formation of carbon deposits…especially in the neck region of the intake valves.”
The document describes these deposits as a sticky coating of oil and fuel constituents that, once formed, serves as a base for further deposits, creating “a circular process, by which the coating thickness of the carbon deposits continuously increases.” Excessive carbon deposits “have extremely negative effects,” the patent application concludes, citing significant performance losses, sporadic ignition failures and, potentially, holes burned in the structure of the catalytic converter (should bits of carbon break from the valves and pass though the combustion chamber).
The document describes these deposits as a sticky coating of oil and fuel constituents that, once formed, serves as a base for further deposits, creating “a circular process, by which the coating thickness of the carbon deposits continuously increases.” Excessive carbon deposits “have extremely negative effects,” the patent application concludes, citing significant performance losses, sporadic ignition failures and, potentially, holes burned in the structure of the catalytic converter (should bits of carbon break from the valves and pass though the combustion chamber).
You can actually read the entire patent with a little bit of digging on google.
Last edited by DennisM; 04-09-2013 at 05:32 AM.
#77
It's something that VW has known about since at least 2002 and is even mentioned in their U.S. patent for DI.
Direct Injection Fouls Some Early Adopters.
You can actually read the entire patent with a little bit of digging on google.
Direct Injection Fouls Some Early Adopters.
You can actually read the entire patent with a little bit of digging on google.
#78
Well, I was making the legal arguement that since carbon build up was specifically mentioned in the patent, it is therefore not a defect, and the DI engine operates the way it was intended to. My guess is the wording was included in the patent specifically to avoid being sued. Off course, VW might still opt to do a free cleaning to keep its customers happy.
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