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Silly question--cool down noise?
This is a silly question but one I have always wondered about. What is it that makes the clicking, ticking and popping noise when an engine is cooling down after being run??
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Rick 1984 911 coupe |
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11-26-2005, 04:20 PM
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Low Speed, High Drag
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It's the exhaust. The metal gets hot and expands then when it cools down it condenses again.
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11-26-2005, 04:50 PM
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Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,840
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You ought to hear the Boxster. The 911 doesn't make much cool down noise. Neither did the '77 I had years ago. I think the more complicated the muffler and cat are, the more noise.
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11-26-2005, 04:56 PM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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fwiw, My SC was fairly quiet, until SSi's.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
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11-26-2005, 05:40 PM
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The noises you hear are the 911 God's giving the engine a quick check before it goes to sleep.
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11-26-2005, 05:51 PM
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1980 Porsche 930
1970 Porsche 911
1980 Porsche 911 SC 3.0
1935 Ford Tudor / slantback
