Piston speed:
stroke in inches x rpm/6=fpm
Blower Capacities:
Sizes and capacity are:-
6:71 small diameter
Rotor dia=5.505", length=14.975", displacement per full turn of rotor=339CI.
6:71 big diameter
Rotor dia=5.778", length=14.975", displacement per full turn of rotor=411CI.
8:71
Rotor dia=5.778", length=15.905", displacement per full turn of rotor=436CI.
10:71
Rotor dia=5.778", length=17.000", displacement per full turn of rotor=466CI.
14:71
Rotor dia=5.778", length=19.000", displacement per full turn of rotor=521CI
This is theoretical displacement.
Retro or high helix will change this considerably.
A worn blower will reduce this a little.
A very good tight new blower and a Teflon stripped blower should be about the same
Supercharger plenum size:
surmising an engine size of 202 6 cyl (you put your own numbers in here) Inlet air density ratio of 1.55.
Eg; 202/6= 33.6666 x 1.55= 52.183333. Air cushion of 3 times cylinder volume is needed.
So 52.183333 x 3= 156.54999 cubic inches for CC's times this figure by 16.387 = 2565.3848
Air Density Index
ADI = 100 * [ (PBAR-PWV) / 29.92 ] * [ 519.67 / ( 459.67 + T ) ]
PBAR = Barometric Pressure (inches Hg)
PWV = Water Vapor Pressure (inches Hg)
T = Temperature (deg Fahrenheit)