Wierd... noises after engine's turned off
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04-01-2003, 10:25 AM
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#2
04-01-2003, 10:53 AM
Re: Wierd... noises after engine's turned off
I get this too. I get this from all my cars. There's a great deal of heat generated from operating the car and all sorts of metal fittings, pipes, and gadgets under the vehicle heat up. When things get hot, they expand. When you turn the engine off, they start to cool again. The tinking/popping/clicking sounds you hear are just all your metal parts contracting again. Don't be concerned by this - it's perfectly normal and doesn't indicate anything is wrong.
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04-01-2003, 10:54 AM
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#4
04-01-2003, 11:12 AM
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Re: Wierd... noises after engine's turned off
If you really want to know the material science behind it...The tinking noise is due to molecular dislocations moving thru the material at the speed of sound. The dislocations go from an area of high thermal stress to an area of lower stress...caused by differential coefficients of thermal expansion. The best analogy I can think of is imagine a zipper with one of the zipper teeth not engaged with its mate on the other side. When the tink happens the zipper magically rezips itself and the unengaged tooth moves to another location. Sorry, that was probably more than you wanted to know.
#5
04-01-2003, 12:44 PM
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