The side exhaust port is 20% more area with better timing.

Mistral is falling behind on rotary technology.

Paul Lamar

 Hi!: regarding the very interesting images added to this note, some
things came into my mind:
-Exhaust gas recirculation (EGR) is a way to reduce NOx emissions, as
any increase in the percent of exhaust gases entered in the next cycle
reduces flame temperatures, and high flame temperatures are the cause of
increased NOx production. (Data from Harry Ricardo in aaron cake.net)
-The cartoons don't give a dynamic image of the cycle, so you may have
the not fully right idea that no EGR exists with peripheral exhaust
ports, when in fact it may be some.
-Wankel RCE efficiency improves with a low pressure exhaust system, and
for this, an enlarged exhaust por area may help, this is a good pro point
in side exhaust porting.
-Peripheral Intake Porting gives the best Mean Effective Pressure, and a
higher MEP is a must for overall power output and fuel economy, but the
situation may change completely with part load or low rpm functioning,
however, aircraft engines do work in an environment  totally different
to a car engine, and what is good for an airplane may be not so good for
a car, and vice versa.

-In reciprocating engines, there is some overlap between inatke and
exhaust, as this is necesary for high rpm scavenging of exhaust gases,
and entry of fuel/air misture in the intake stroke, but Wankel RCEs are
different, I don't know about data regardings this.
-Paul cited somebody having tested a PP Mazda with Reed-Valve controlled
intake, if somebody knows where to locate data about the results of this
experiment, please let us know, for those interested in improving their
engines for street car use, I continue supporting the idea thata Reed
Valve controlled Peripheral Intake Port, the valve placed as close to
the Trochoid surface as possible, would give improved results in
everyday life use of a car with an engine modified this way (The Swedish
motorcycle maker Husqvarna sold a 2-stroke, single cylinder, air cooled,
500 cc engine for an off-road use, and the intake was controlled by a
Reed-Valve, perhaps it would be possible obtaining some Reed-Valves, the
cage and the Reeds, from an Husqvarna retailer or dealer and test the
idea).
Thanks for your kind attention, have a nice weekend, best regards, salut +
José Gros-Aymerich

Hi,  many two strokes use reed valves on the intake:
http://www.boyesen.com/  is the leading aftermaket supplier.
May not have an advantage in aircraft use.


Murry I. Rozansky


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