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Ok, here's the answer to my question. The second
image shows a three barrel carb with the primary going to two side intake ports
and the secondary going to the Peripheral ports. Interesting
concept.
Ed
----- 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.
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