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A 4-cycle engine only makes power during 1 of it's cycles, until the next ignition during the next power cycle the engine is slowing down. The flywheel mass helps to maintain momentum until the next ignition firing accelerates the crankshaft faster. The flywheel inertia smooths these variations in rotational speed of the crankshaft. The knock sensors can detect excessive variations in this rotational speed & interpret it as "knock" & signal the DME to retard ignition timing. The "low mass" LWFW is not heavy enough to prevent this from occurring.
I believe this is what Jake Raby was alluding to.
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