Paul and Jose,
From Sir Harry Ricardo... turbulence is everything for flame growth when the kernel is first ignited.
Two strokes use squish bands... four strokes also use squish areas plus vortex generation to increase the burn rate.
I decided to used a small NACA duct and got provable positive results.
First attachment is the prototype proof of concept that I used with directed air.
The second and third are attachments are examples of the resulting increase in slope of the burn rate.

The yellow post-it shows the average of the slopes from 4000-6000 rpm (about 250 samples) for each before and after the NACA mod.
Barry Bordes


With all due respect to Harry that is in a piston engine Barry.

A piston engine combustion chamber is not in uni-directional hurricane wind speeds.

This another major differenced between a Wankel and a piston engine.

What is that software or device you use for those jpgs?
Does it determine BSFC? You may be losing BMEP due to leakage across
a larger hole.

If it is a pressure sensor you are only measuring pressure in one location.
The Wankel has a moving combustion chamber so the total effect is
the integral of pressures over time. The engine is still generating torque
after the trailing apex seal pases the spark plug hole.

On the other hand too much pressure too soon is negative torque.

I can't read the post it notes so if you could take some close ups of those that
would help.

The bottom line is total HP out and BSFC.

Paul Lamar Happy New Year.


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