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Old 10-17-2002, 04:12 AM
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Question What Causes White Vapor in Cold Temperatures?

Well, Just what was in the subject. I've noticed white smoke or vapor coming out of my tailpipe. I only happens when it's cold (about 55F). I just had the stem seals replaced. Hope it's not related! Whats goin on?
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Old 10-17-2002, 04:35 AM
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Join Date: Sep 2002
Location: Newcastle upon Tyne, UK
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Water vapour

The combustion process produces water. The white stuff is partially condensed water vapour. When the exhaust system is hot, the water vapour stays as a colourless gas.
Cheers, Neil
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Old 10-17-2002, 12:08 PM
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Location: Saugus, CA USA
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I thought it was

When the exhaust cools water vapor (humidity?) condenses and as it heats up it boils off.
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Old 10-17-2002, 03:06 PM
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Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
Ever seen vapour trails from a jet aircraft at high altitude? Exactly the same thing, only the condensation cloud remains due to the low temperature of the air up there.
Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
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