So, any info as to why Mazda bridge ported the intake and didn't on the
exhaust?
Kevin

They did not bridge port the intake. Perhaps you are referring to
the small chamfer on the side of the rotor.
A true bridge port is where some of the port is on the edge
of the rotor housing.
Paul Lamar

Kevin,
I guess you mean side ported the intake and peripheral ported the exhaust.
I wouldn't have a clue mate ! but my guess would be that they were looking
for a direct exit for the exhaust and it was early days for the rotary
development.

It may be that the side intake ports were only developed to address overlap
concerns. The Norton (NSU) had both peripheral intake and exhaust ports and
had some problems with overlap and idle - which was overcome in other more
complex ways, from what I hear.

I guess the side ported exhaust is a natural logical development to remove
all overlap.

This would be a problem in aluminium housings because of the thin septum in
the centre housing but not a problem for cast iron. If one were to consider
an aluminium centre housing in a Renesis it would require an Inconel insert.
George (down under)
BTW Paul,
Why is there that chamfer on the side of the rotor - does it enhance initial
flow for port opening ? - G.

Yes.

Paul Lamar
 
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