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Old 10-17-2002, 04:35 AM
neileg neileg is offline
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Join Date: Sep 2002
Location: Newcastle upon Tyne, UK
Posts: 215
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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