calculating intake runner length

[!kid]

i came up with a 13.54 long runner with a 1.5 diameter runner
(inches)

a 288 cam
6700rpm
subtracted 20 degrees
pressure wave speed of 1300
3rd pressure wave

i did not do the math to get the right diameter runner so it will be a little
off

i got all the info on how to do this from hear ...

http://www.grapeaperacing.com/tech/inductionsystems.pdf

what do you guys think?

http://www.grapeaperacing.com/

they have some real grate tech articles

[nando]

from what I understand, the math and theory are great and all - but 99% of the time, you are limited by what actually fits in the engine bay.

realistically, you can have a good powerband to 7000rpm with the stock manifold. do some cleanup/port work, it will flow plenty. Plus it uses the 2nd reflection which is much stronger than the 3rd (and also why M20s come on so strong at 4500rpm).

[!kid]

how do you know it uses the 2nd wave?