How do I compensate flow rate of a gas from air?

Please elaborate more.

What type of fuel gas?

What type of mixing system?

And what is the fuel and air mixture being burned in?

In actual engine, the fuel type will use syngas: H2 25%, CO 25% and N2 50% volume.

Mixing system type, is venturi gas mixer type.

Just keep adjusting the ratios until it runs the best!

When you reach your point of maximum power you are at the point of greatest fuel efficiency as well.

I don't know about your mixture, but for gasoline an ideal mixture is 14.7 to 1 ratio.

But it is not that simple.Ther are lots of dynamics that have to be accounted for.

Modern engines use a mass air flow sensor,a manifold absolute pressure sensor, throttle position sensor, air temp sensor,coolant temperature,engine timing,O2 sensor and several others applied to an algorithm to determine the fuel mixture for a given load and running condition.

An engine control module could serve your purpose, with slight modifications, but you would have to obtain the source code and pin out information.

Good luck.

Depending on what your going for the ratios for many fuels have two different ideal points.

For gasoline there is the stoichiometric ratio of around 14.7:1 and then there is the peak power and fuel efficiency ratio that is around 12.9:1.

One gives you the cleaner burn but the other creates more power with less volume of air which equates to less fuel being burned to get that power.

Thats part of why emission systems cause an engine to loose power and efficiency. They changed from the power and efficiency ratio to the theoretically cleaner burning stoichiometric ratio.

Thanks a lot for all suggestions..