Can high speeds expel carbon build-up through exhaust?
08-03-2011, 02:19 PM
#6
Seared
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08-03-2011, 02:56 PM
#10
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High speed? No.
High RPM? I don't think so but it's up for debate. I would suggest that not much carbon build-up occurs at normal engine operating temps and high RPM. But I don't think existing build-up is expelled during a 'spirited' drive. The driver will feel better after a spirited drive though.
High RPM? I don't think so but it's up for debate. I would suggest that not much carbon build-up occurs at normal engine operating temps and high RPM. But I don't think existing build-up is expelled during a 'spirited' drive. The driver will feel better after a spirited drive though.
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M. Schneider (03-29-2020)
08-03-2011, 03:06 PM
#11
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High speed? No.
High RPM? I don't think so but it's up for debate. I would suggest that not much carbon build-up occurs at normal engine operating temps and high RPM. But I don't think existing build-up is expelled during a 'spirited' drive. The driver will feel better after a spirited drive though.
High RPM? I don't think so but it's up for debate. I would suggest that not much carbon build-up occurs at normal engine operating temps and high RPM. But I don't think existing build-up is expelled during a 'spirited' drive. The driver will feel better after a spirited drive though.
If you think about it, the engine runs richest when at high throttle loads. At part throttle, you are looking at a stoich a/f ratio, which should not result in much carbon. The worst time for carbon buildup is when the car is cold due to lack of efficiency of a cold motor and the open loop.
I don't think high revs or high speeds would remove much if any carbon.
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M. Schneider (03-29-2020)
08-03-2011, 04:19 PM
#13
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Yes, higher exhaust gas temperatures for continuous periods would burn off carbon deposits. We're talking 700F +, the hotter the better, and the more exhaust flow, the better. Higher vehicle speeds? Not necessarily. Higher engine speeds? Not necessarily, it is all about your engine load, generally highest exhaust temps are seen at the rated point. You would also have to sustain those temperatures for a minute or so at the very least. The likely hood of achieving anything significant in a normal driving situation is not likely. Perhaps a hot track session where you are running at high power for several minutes is your best chance, but even then you slow down in corners, it won't be continuous. If you live in the mountains or have access to a dyno, run as close to your rated speed and full load and your good 
I'm not sure if SAI applies in this case because it is on a separate path from exhaust.
I'm not sure if SAI applies in this case because it is on a separate path from exhaust.
Last edited by uicnick; 08-03-2011 at 04:41 PM.
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M. Schneider (03-29-2020)
08-03-2011, 04:45 PM
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^That's one reason I use it, before an oil change. I don't know if I have any carbon build-up. And I don't know if the Techron removes it. But I feel better knowing I do.
Does fuel quality play into it? What about fuels with ethanol vs pure gas?
Does fuel quality play into it? What about fuels with ethanol vs pure gas?
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M. Schneider (03-29-2020)