> Dave Lemon owner of Mazdatrix discovered a strange phenomenon.
    > Apparently a Weber carb on the end of tuned p-port manifold
    > can enter a unstable condition where the mixture obviously
    > is changing rapidly from way too lean to way too rich.
    > The engine goes maximum rough and a ton of fuel air mist
    > eight feet high appears over the carb intakes. We are
    > not sure what causes this. It could be a mechanical resonant
    > condition of the carb intake system shaking the float bowl
    > or it could be something to do with rapidly reversing airflow
    > confusing the venturi sensor. It happens about the tuned
    > RPM or peak torque RPM. One can pass through it. It seems to
    > be a function of the jetting. This is a new one on me.
    >
    > We will know more in a couple of days.
    >
    > I was pleasantly surprised to find out the 2nd gen front cover
    > water pump and ignition distributor fits the RX8 engine with a
   change
    > to a 2nd gen drive gear on the nose of the RX8 e-shaft.
    > That makes for a very simple stand alone ignition system.
    > --
    > Paul Lamar ...No rotor no motor.



   OMG!!!!    I want... no, NEED, to see that pic of an 8 ft tall
   mist'er!!!
   NO SMOKING IN THIS AREA!!!

   OMG!!!!


   Gary Buster
   Tyler Texas



Pretty neat..  With the right conditions it's possible to cause a column
of air to move in an interesting fashion.  Have you ever played with
blowing out candles with an old fashioned oatmeal box (the round kind)?
Take the lid off and cut a 1" dia hole in it.  Tape the lid on.  Light a
candle.  Aim the hole in the box at the candle and tap on the other end
of the oatmeal box.  Tapping on the box will project a column of air a
significant distance and blow out a candle.  I think I've done it from 4
feet with just a light tap on the bottom of the box.  Amaze your kids
and your friends..

Didn't we recently have a discussion about velocity stack shape and the
effect it has on reversion (for lack of a better term)?  Wasn't there an
article presented which proposed that some shapes caused this effect
much less?

I'm not sure that the RPM that corresponds with the maximum fuel spray
distance is actually the one which leads to the best volumetric
efficiency...  i.e., I don't know if that event corresponds to the
maximum chamber pressure.  Maybe the pressure builds up in the port but
the rotor is cutting off the opening.  It would be good if the
rough-running problem could be isolated from longest column resonance.


Matt-



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