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...remember, it's about WHEN the exhaust and intake valves are both open, so it's ALL ABOUT TIMING, ie: when the low-pressure exhaust rarefaction get's reflected back up the exhaust pipe so as to arrive back at the simulataneously open exh and intake valves.
...no sudden change from pressure to rarefaction means no reflection back up thru the exhaust gas to the valve(s), and thus no "tuned" exhaust scavenging action.
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