Paul,
Any cool area that cannot enter into the combustion process will lead to wasted energy.
An example would be the area above the side seals.

 I went the opposite way.
 I increased the turbulence and flow at the sparkplug and found a measurable difference.
The burn rate increased as shown with combustion testing.
It then required removing 2 degrees of timing. (see attached)

The best solution IMHO would be a way to seed the chamber with a catalyst-like substance
 that would simultaneously ignite over all of the rotor face captured area.
Barry Bordes

Yes but it is not enough to affect the BSFC by 10%. Something else is going on.
I think it is the wind in the combustion chamber.

Your catalyst might work.

You also need a way to test the BSFC.  If you have a prop on the engine
and you run it at a constant RPM long enough to burn a gallon of gas
you can test the BSFC by how long it takes to burn a gallon.

The longer it runs the better the BSFC of course.

It will be hard to measure the effect ( if any ) on that NACA duct.

Paul Lamar



Hi Paul,
   Further to my thoughts on CC turbulence. It is well known
(as you know) that recip engines rely heavily on this effect. In two valve per cylinder  it relies on "swirl" as the mix comes in through one valve and out the other. This spin effect is increased as the piston comes up, rather like an ice skater as they move their arms in to greatly increase their spin. In an engine with two valves per cylinder it "tumbles" instead rather like an acrobat or diver doing a forward roll. Possibly the turbulence could also be improved by injecting hot air in through the trailing plug hole (NOS would be better !) this will give a small (or even big) supercharging effect also. Of course this will affect the mixture and must be allowed for.
   Chris.
   p.s. no need to put this in if you think it's all bullshit.


There is a very Fundamental difference in the moving  combustion chamber of a Wankel
and the fixed combustion chamber of a piston engine. Apples and oranges.

Paul Lamar

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