Here is a drawing I made up of a 6-port 13B intake ports. The center

housing

port is in red, end housings in black. Drawing was made on Turbocad using
graph paper as a "digitizer" and transferring coordinates to CAD. Turbo

cad

computed the area.
I come up with 5.07 sq. in total port area for 2 rotors, about the same

area

as a 2 1/2" throttle body. Of course the throttle body does not need to
match the port area, it's just that the velocity and pressure loss would

be

lower if it is larger than the port area.

Chuck Dunlap

Chuck,
Thanks Mate !  very interesting and as I assumed.
I do appreciate your going to the trouble - I shall keep this and mull over
it some more.
You have quite obviously spent considerable time on the subject yourself.
Thanks again
George 9down under)

I think anybody porting a six port ought to remove the cast iron divider
between primary and secondary. It does nothing for us but reduce
the power.

Paul Lamar
 
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