plenum size

hello

hello i have a problem with my harley supercharger bike

what the good size for th plenum ?

1.5 ,2 ,3 thime of the motor?

thanks
eric

About half the Engine size it says here

http://www.fefcholden.org.au/techinf...e/norman4.html

Jim.

thanks for the answer

but my motor is a vtwin harley

you think 50 % is good for vtwin motor?

a+ eric