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When all four cylinders are sucking through the venturi, there will be skin friction all along the path. A restriction at 1/4th" of that path prolly has less effect than the skin friction throughout the full length.
The mass of air will speed up locally, suffer a lot of turbulence and then slow down again.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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