>      > 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-

   Actually Matt, the oatmeal box trick is known as a vortex cannon.  It
   shoots a spinning toroid of air.  They used to sell a toy for kids
   that resembled a futuristic ray gun (at the time)  and added enough
   smoke to see the toroid.  Someone even considered large scale
   versions for downing enemy aircraft.

   Chris Cosman

Ooohh!!   A _vortex cannon_!!  Danged marketing yahoos..  :)

My only point was that you can sometimes make a column of air do
something interesting.  Even with seemingly low energy.


Regards,

Matt-



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