Quote:
Originally Posted by jhbodle
Not sure myself, but ask the question on any car forum and you'll get the same answer. My best guess is that when revving hard in neutral, all that kinetic energy that is normally spent driving the wheels has to be soaked up by the engine.
Imagine throwing punches hard at a punching bag then doing the same without the punching bag there. It's gonna mash your arm.
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But you don't need much power to rev to the redline with no load. If the engine is well balanced, I can't quite see what the problem should be.