I've been messing with intake calculations and am looking at the Helmholtz multi-cylinder calculation now. There's an example on This Page that is right out of the book I'm using.
I'm a little confused about where to model the plenum in this equation: should it be modelled as part of the intake, or as part of the 'dead' volume of the other cylinders?
Lehigh Formula SAE
www.lehigh.edu/~insae/formula