Bi is right about cogging, what's happening is that there is some repulsion to rotation but when past the point of repulsion the energy is given back.
Similar thing with diesel engine, you'll find they spin over with no fuel quite easily once the momentum is built up.Now,say you've got a leaky valve, the engine becomes stiff to turn.
Similar thing with diesel engine, you'll find they spin over with no fuel quite easily once the momentum is built up.Now,say you've got a leaky valve, the engine becomes stiff to turn.
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