----- Original Message -----
Sent: Sunday, June 17, 2007 10:15 PM
Subject: Different Rotary Port configurations
Ok, getting a bit quite again. Here is
something that some of you may find interesting. Its a graph
comparing the possible different port configurations for the Rotary
engine.
The top graph shows the intake and exhaust port
opening for a engine with a peripheral intake and peripheral exhaust -
such as a 13B which has been converted to a PP intake.
The trapezoidal shapes show the port area. For
example on the first graph the first rectangular area entitled PORT shows
the Peripheral exhaust port open at 63Deg ATDC. There are two
trapezoid areas shown for the Peripheral intake. A "P" which I
presume stands for Primary and a much larger P+S which I presumes stands
for a combined primary and Secondary port. Although, I do not ever
recall a PP with two tubes one for primary and one for secondary. So
there may be another explanation.
The second graph is our traditional 13B with
sideport intake and peripheral port exhaust. Here the intake timing
for the intake is that of the NA 13B although it shows the intake
opening a bit later than the stock 13B but closing at the stock 40 deg
ABDC.
If you look at the area under the first graphs "P"
trapezoid it appears to be open much longer than the P for the side port
intake (2nd graph), but the trapezoid is not as high. Wonder what
that signifies? Open longer but not as large a port area?
Anyhow, thought some of you might find it
interesting.