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Message: <blockquote data-quote="masCh" data-source="post: 224817" data-attributes="member: 964">I dont practice this. For some reason my common sense tells me that you dont want metal and other materials to expand and shrink too many times. If I open the bonnet to cool the engine, metal will shrink and when i restart it and run it, it will start to expand again, many-many times. I prefer to let it cool slowly so that the difference in temperature between the parts are more uniform.. remember metals cool faster than plastics or rubber, so you dont want metals to shrink too much before the plastics/rubber and other materials. The truth to this we may never know unless we can interview some engine designers</blockquote>