Here is a some rare and interesting data on the fuel consumption
characteristics of a Mazda rotary at partial power. Something I have never
seen on a Mazda rotary engine before. I think Tracy will find this 
interesting as it confirms the research he is doing by leaning 
the 13B at altitude and partial power. This is a mild street
ported EFI Mazda four rotor engine. Note the numbers are
under .45 pounds of fuel burned per HP per hour at 5000 RPM. 
This is a conventional peripheral exhaust port so the RX8 
version should do even better with side exhaust ports.
The intake manifold is nothing special and not particularly
well optimized IMHO. More pictures on the engine shortly.

I am indebted to Scott Duffy VP of Spectrum Power for sharing this 
with me. It is from some dyno runs on an all aluminum four 
rotor Mazda aircraft engine engine Scott designed using stock 
Mazda 13B rotor housing. More on the aluminum end housings 
later. I am working on Spectrum to offer them for our use.

Paul Lamar
 
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