Big metal block has big rotating part inside. Big rotating part rotates REALLY fast. So fast and with soo much force it wants to rotate the big metal block around it too. The result is that the engine twists between the crankshaft which is spinning, and engine mounts which are stationary. The twist is more or less noticeable depending on the mounts used. Loose mounts allow engine to twist. Stiff mounts will make the entire car chassis twist if the engine is strong enough.
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