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Message
I also had a chance to ring the muffler and see
what the resonant frequency of the structure is. As fate would have it, the
fundamental is 2400 hz. This is a multiple of the 1200 hz resonant
frequency of the cavity of the muffler. So it will self excite when the muffler
is really working hard. This explains the horrible screech at 6000-6500 rpm.
This is also bad for fatigue life. I should be able to weld a couple of
strips of metal to it and fix that problem.
Sorta gives a
new meaning to "tuned exhaust" :-)
Cheers,
Rusty (RV-8
and Zenith XL are now neck and neck)
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