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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
Old 11-26-2005, 04:20 PM
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ZLP ZLP is offline
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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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Old 11-26-2005, 04:50 PM
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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.
Old 11-26-2005, 04:56 PM
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fwiw, My SC was fairly quiet, until SSi's.
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Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee.
Old 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.

Old 11-26-2005, 05:51 PM
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