"Rogers, Bob J." wrote:

Based on all that I have read in available literature and from comments on
this forum, it appears that the use of peripheral port intakes provides a
significant advantage in power for the rotary engine.  Because of the
agressive timing on a peripheral port, however, it seems that a major
problem associated with this type of intake is very poor idling
characteristics.  How bad is it really?  I know that Powersport is using a
butterfly valve at the port opening to improve air  flow characteristics and
velocity at low engine speed.  They also have intake tubes that are less
than 1 and 1/2 inches in diameter, which increases airflow velocity and
improves idle characteristics, when compared to the huge port openings that
Racing Beat offers.

Before I spend a lot of money on the modifications necessary to convert a
Mazda 13B to a peripheral port intake engine, I would like to get a more
thorough discussion of the pros and cons, along with the technical aspects
of what effect the peripheral port has on overall engine performance.  Does
anyone know of a book, treatise, technical paper or other comprehensive
discussion on the subject, including actual data on just how poorly the
engine really idles?  I am hoping that someone has already been down this
road and has written extensively on peripheral port engines.  Is anyone
currently flying with a peripheral port engine, other than Powersport?

Any suggestions would be appreciated.  If you know of a technical paper or
book, I would like to know how to get it.  Thanks.

Check our web site below for a list of books and papers.

Paul Lamar
 
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