The 13b is listed as 1.3 liter displacement. Is this per complete rotor revolution (3
crankshaft revolutions) or per crank revolution?

Either way, I am getting some really high exhaust velocity numbers at 6000 rpm.

KA


The true displacement is 2.6 liters. Something to due with a Japanese tax on
displacement and Mazda thought they could get away with the lie :)

13B rotaries are raced in the 2.6 liter class world wide
for a good reason. The only reason they generate more power
than a 2.6 liter four cylinder engine is they turn faster
and breath better. Lately that is less true as the piston
engine RPM has been raised by detail development and the
use of high strength to weight ratio materials like titanium.
Also four valves per cylinder has improved the breathing.
It is very rare for any 2 valve cylinder to have a VE over one.
The RX8 engine is just over one and P-ports are typically
1.2.

Formula One (2.5 liter as I recall) V8 engines are now
turning 19,000 RPM. At least four valves per cylinder with
a very short stroke so larger valves can be used for a given
physical cylinder displacement. You will not find the details
of a competitive Formula One engine anywhere. Its a well
kept secret. However I would not be surprised if the VE's were
well over one. Applying the RPM difference to a 2.6L p-port rotary
making 340 HP at 10,000 RPM would make the Formula One engine
about 19,000/10,000 times 340 HP or 645 HP which is about
right for a Formula One engine.

Curtis Wright discovered that 19% of the total  energy in the R3350 TC exhaust
is wasted by the exhaust valves. That is about half the kinetic energy used for the
power recovery turbines. Needless to say there are no exhaust valves in the rotary to
waste kinetic energy.

Let us know what numbers you are getting and at what pipe diameter for the exhaust
gas velocity.

We suspect when the port first opens the velocity is super sonic judging by the noise
they make.

Paul Lamar
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