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blue2000s · 08-08-2008, 12:44 PM

It's simply the cooling and contracting of the parts of the engine and exhaust system. Different parts contract at different rates, so they rub against each other as they drop down in temperature.

08-08-2008, 12:44 PM	#2
blue2000s Porscheectomy Join Date: Mar 2006 Location: Seattle Area Posts: 3,011	It's simply the cooling and contracting of the parts of the engine and exhaust system. Different parts contract at different rates, so they rub against each other as they drop down in temperature.