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Old 02-19-2005, 01:43 PM
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Default excessive condensation? (exhaust tips)

I noticed twice yesterday, upon turning the car off from two 15 mile trips (in 50 degree weather), smoke was exiting the exhaust tips (similar to that after firing a gun)... I have never noticed that before. There appeared to be a good amount of condensation inside each exhaust tip...
is this normal?
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Old 02-19-2005, 01:54 PM
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Makes sense to me. Think of a cold drink on a warm(ish) day. Condensation collects on the outside because of the temperature difference of the drink and the outside air. Well think of your exhaust that way, only the other way around. You have cool(ish) air on the outside and the warm exhaust inside the pipes. It would make sense that condensation would collect on the inside of the pipes, then expelled out the tailpipes because of the velocity of the exhaust flow.
Of course I don't know this for sure, I pulled it out of my arse, but it makes sense in my head.
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Old 02-20-2005, 12:30 AM
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Floor it and watch the rear mirrors, now that is a lot of steam!

When it is cold outside, mine steams out the tips for a while (about 5 min or so) after it is shut off.
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Old 02-20-2005, 06:36 AM
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The two Main products of the combustion process are CO2 & H2O. With short trips, the exhaust does not build up enough heat to keep the H2O a vapor before it exits and will condence out, mostly in the muffler. That's why almost all mufflers that fail rust from the inside-out. I wouldn't worry to much about it unless most of you drives are this short or steam continues to be seen after exhaust system is fully heated. If excessive vapor is noticed out of a warm car especially on a warm day, may be a sure sign of problems [head gasket for example] IMO.
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