mike h wrote:

Paul, I havent' been back on the list since February or so due to my
workload, but I have a question for you and your bunch of engineers that
no-one else has been able to approach with an answer.

I did the math for speed of sound in in/sec and the time of the exhaust
pulses at 5500 RPM (0.0109...) and it works out to almost exactly 12 feet.
This makes sense, as that is a pretty good length for a long primary system.

What I'm trying to figure out is some sort of equation that will show me
harmonics; IE 1/16 of the 12 feet is 9", which would make an adequate length
shorty header. But I don't know if my reasoning is sound.

End goal is to have as short an individual runner header as possible before
a collector and/or expansion chamber, that's better efficiency wise than the
stock log manifold.

Engine, if it matters, is a stock port 1985 12A.

can you put this question to the list and see what it joggles free?

Thanks!

Mike Harrington
gtx1990@hotmail.com

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