In a message dated 3/13/2007 2:24:11 P.M. Eastern Standard Time,
wrjjrs@aol.com writes:
Enerest, Please note I mis-typed the line and I believe the noise will
increase again as the tuning improves. There are many factors here,
timing, mixture and exhaust tuning. If all the other factors remain the same I
have found that ported engines are usually quieter when too rich. This is
anecdotal, I haven't recorded it with a DB meter. My personal explaination is
that the cylinder pressures are higher when better tuned and the sudden port
opening in a rotary or 2-cycle causes a louder "bark" The rotary is
particularly bad in this respect.
Bill Jepson
The over rich rotary sounds dull and a bit less noisy, with a big fire ball
on closed throttle.
Over lean sounds raspy and sharp but unpleasant. Crackles on closed
throttle with little or no fireball.
Did anyone hear the RX-8 three rotor at the Mexico city race? Very nice
sound. Down on power at 9,000 feet but won the race anyway.
Lynn E. Hanover