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Whats that sound coming from under the hood of a car when you shut off a car engine after driving for a while and it sounds like tiny rocks hitting metal?
Mothra820
That is the metal of your exhaust system, most likely a heat shield contracting as it cools. As the metal heats up it expands and as it cools it contracts or becomes smaller so the sound you hear is the metal moving as it does this.
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∙ 17y ago
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