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.

 >>Snip:
Please let this be true.   Makes my 2" stubs into a tangential look
very, very smart  even though I did not have a clue.   Other
advantages:   light weight, does not occupy important space, and get the
heat out of the cowl very rapidly.    I was thinking of these when I
built it but worried it would cost h.p.       Jerry

P.S.   ignore the intake.  It is destined for the trash.   I'm going to
convert to a two port.

 
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