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As the piston drops and air is drawn into the cylinder, the gasses begin to accelerate down the port towards the cylinder.. when the piston is at the bottom, air will continue to cram itself into cylinder due to inertia, then the valve closes trapping the air in..
There is math involved. Too small of a port will choke the cylinder, too large a port will mean a low velocity of air and will limit the 'cramming' effect.
I didnt provide any answers but I hope this helps you out.
Personally I'd ask a good engine builder and go with his recommendation.
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