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-   -   Silly question--cool down noise? (http://forums.pelicanparts.com/porsche-911-technical-forum/253277-silly-question-cool-down-noise.html)

Nathans_Dad 11-26-2005 05:20 PM
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??

ZLP 11-26-2005 05:50 PM
It's the exhaust. The metal gets hot and expands then when it cools down it condenses again.

Zeke 11-26-2005 05:56 PM
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.

island911 11-26-2005 06:40 PM
fwiw, My SC was fairly quiet, until SSi's.

Bob's Flat-Six 11-26-2005 06:51 PM
The noises you hear are the 911 God's giving the engine a quick check before it goes to sleep.


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