Paul
Fuel Injectors have been greatly improved in the
last few years.  How good are the Mazda Wankel
engine fuel injectors/  ~ 10 microns?

What is the BSFC of the RX7 and the RX8 engines
for normally aspirated as well as Turboed?

The rotor has a symmetrical shape between the apex
seals with a dished elongated volume in the
center.  This is I assume to try to 'sphere
-alize' as much as possible to help volume to
surface area ratio, optimized for exhaust/intake
flow rates?  But, is this the best configuration
or has rotor inter-apex seal configurations
( especially in the side port engines) been
investigated by other than MAZDA in the Mazda
Wankel engines?

Can the RX7 or RX8 be turboed to 150HP/rotor @ say
7500RPM?  To be used for take off and climb
performance with 105 hp/rotor for cruise.

Or  could this be more easily accomplished with
N2O?

The  engine is certainly a rugged design except
perhaps the various rotor seals?

Norm

That is a good question. I don't know.

BSFC normally aspirated is down around .47. We don't have much data
on the turbo but I suspect the fuel burn is higher. The main improvement in
the RX8 engine has been at low power low RPM rangers. Particularly at idle.

Mazda did a lot of experimenting with the combustion chamber shape. Some of the 
considerations were emission so it is not necessarily optimized for HP or BSFC.
Midwest/Diamond uses a different shape.

Yes 300 HP is no problem at all for a 13B turbo engine as long as you can
choose a turbo that will live. Several people are still using a modified stock
turbo because it is small, has a built in waste gate, is water cooled and is very 
much easier to install than say an after market TO4.

Ken Welter used NOS for years to help him get  off the water with
his NA 13B powered 2900 pound Coot. Did not seem to hurt the engine.
Allan Tolle used NOS to set the all time record time to climb to 3000
feet at Sun & Fun. His competition Pushy Galore (Cat?) was also using 
NOS however. He also used it for take off with a top speed prop
in the Sun 100 cross country race. Something in the neighborhood hood of 
300 to 350 HP I suspect. Of course he also had a p-port engine which helped.

Yes the stock 2 mm seals tend to fracture if you allow the turbo engine to detonate.
I highly recommend 3 mm seals if you are going with a turbo. Detonation
is almost unheard of with an NA engine. 

As long as you keep the foreign objects out of the NA engine, keep it cool 
and mix 2 cycle oil in the fuel it seems to last forever.

Paul Lamar
 
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