I think that I might have missed something along the way, but isn't

there a

residual amount of pressure from the exhausted chamber that goes into

the

intake manifold when the rotor passes the intake port, thus creating a
pressure wave up the intake manifold? Or does a tuned exhaust scavenge

the

last bit of pressure out of the exhausted chamber?

Inquiring(confused) minds want to know.
Brian Trubee

There is a small bit of comunication between intake port and exhaust port on
the current (and peripheral port) Mazda rotary.   But, if it were a major
factor, the new Renesis rotary would be a dud since it has no overlap at
all.  The intake pressure characteristics will look almost identicle to the
current rotary even without the exhaust factor.

 I agree that the exhaust pressure data on the chart under discussion is
confusing, partly because it is hard to separate the intake & exhaust
pressure waveform in parts of the cycle.  Another confusing factor is that
exhaust pressure readings can vary radically depending on configuration of
the exhaust system.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

Tracy,

I was assuming that the reason that the two traces overlap (inlet pressure and
exhaust pressure) exactly is that the two tracts are interconnnected via
the combustion chamber for that portion of the cycle.  I assume that the
exhaust exiting is sucking the new charge in across the combustion chamber.

Now I am NOT a rotary expert, but can this be the case? - basically is there
a time in the cycle that one apex seal is halfway across the exhaust and the
inlet
port to that face of the rotor (that combustion chamber) is also open?  This
seems
to be the easiest way to get the two traces to overlap as precisely as they
appear to.  Don't laugh if this is mechanically impossible - I barely understand
how this darned thing works and have never taken one apart, so it is
a bit of a mystery, altho I *theoretically* understand it, and certainly
respect the motor.

Bill Freeman

 
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