Paul,

. I personally am going with Hurley Engineering apex

seals as they are softer and probably tougher than the Mazda cast iron

or

ceramic seals not to mention a whole lot cheaper.

Why do you think these are better that the Mazda seals?  Usually you are
saying how good the Mazda engineering is on parts....why have they scrimped
on this most important part?

Jim Brewer
Albemarle, NC

Mazda has other priorities and that has been smog and low speed fuel
consumption. Mazda apex seals are optimized for these conditions.
The boost and ignition timing on the stock turbo cars has also been limited
to make it highly unlikely that detonation will occur.

This old chart from the 60's illustrates the problem with
the low speed fuel consumption of the rotary.
Note: at the still modest HP requirements of 80 MPH for
the 65 Mustang (say 60 HP) the rotary and the six cylinder piston engine are not
that far apart. At low speeds it is a different story. the rotary is
much worse. The same relationship holds true today to a lessor extent
with overall improvements of course. 

I am going for a margin of safety in apex seals as I wish to explore 
the limits of the turbo rotary in aircraft use.

Paul Lamar
 
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