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i think that is dependent of what the starting mass was? and how well that was suited to the "engine" in question! and what engine is was fitted too! renault have a huge storke, but make good torque. a redtop for example is v short stroked revs lots and makes little torque, etc. the starting...
there was a artical online not too long ago, A guy did some tests on a paxo/gti engine
they used 4 fly wheels.
the lighter the wheel, the less torque they got on the RR.
once a bigger mass is spinnig its more powerful than a compact disk spinning if you get what i mean.
there is a fine line to what weight they should be, as too heavy. there harder to spin etc