Hi Paul,

  Is the volume of the plenum chamber on a throttle body/plenum setup
 critical in any way ?

                                  Cheers Chris in NZ

 It has something to do with it. Technically it is called a
 Helmholtz resonator.


 Paul Lamar



 Hi Paul,
     Thanks for all that, very helpful, I don't know
 what I'd do without all this help and
 info from your newsletter, I might have been reduced to
  (dare I say it) putting in a
 piston engine !
         Cheers Chris in NZ.



 Chris,
 This explains it pretty well.
 Paul Lennemann

 Does all the theory on Paul Lennemann's induction design attachment apply
 apples to apples with rotary's as well as pistons? Or what would the
 differences (if any) be.

 Alex M

The difference  is the ports on a rotary never close for long periods of
time. As one chamber is filling another is right behind. Same goes for the
exhaust.

On a one cylinder the intake and exhaust are  closed 3/4 of the
time. The rotary is a mix of turbo jet and electric motor :)

Paul Lamar

thanks, got it,

Alex