Al, focusing on the losses at these velocities and thinking that re-accelerating the column of air in the intake tract is a bad thing misses the point entirely.  That's like saying a supercharger will drop horsepower because it takes power from the engine to turn it.

Well; I don’t think it misses the point entirely.  I was just pointing out that accelerating the air uses energy, which is a negative in addition to other losses (reducing manifold pressure).  I didn’t mean to imply that you couldn’t get it back in a greater charge – it’s just not free.

 

 And, of course we must keep in mind that inertial effect is separate from the harmonic effect.

        Here is a link to a pretty good explanation of how to select the correct intake runner length:

        http://www.hotrod.com/projectbuild/113_9907_efi/

        They say that the runner length should equal the third harmonic wavelength.
Al