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Ok its starting to make more sense to me now.
Is this particular resonant frequency entirely mechanical or does any amount of tuning (head changes, cam changes) affect things? I think thats crossing over a bit with a conversation on airflow based resonance (which is usually torque peaks, "sonic tuning", 105% volumetric efficiency type effects done right) since it's about seeing how slow can you go.
I'm wondering how I would go about systematically finding the resonant frequencies of different engines to help punch in those specs... this obviously creates a brick wall I have to design around since i'd be doing things outside of what the engineers normally do.
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