David Redszus wrote:Since the OP was with regard to O2, I'd like to pose a question.
We know that stoich means a perfect a/f ratio where all the air is combusted with all available fuel.
But a stoich a/f ratio does not produce best power; we need to go slightly richer than stoich.
Why does that work?
If we have already consumed all available air, the additional fuel does not have any air available to burn.
How can it then make more power.
It's because there's 3 different main chemical reactions happening each of which liberates different amounts of energy.
By providing an excess of fuel, you get more of the first and less of the third.
C + 1/2 o2= CO.......most energy.
CO + 1/2 o2 = CO2
H2 + 1/2 O2 = H2O.....least energy
With a lambda of 0.85 you have emissions of H2 and CO due to incomplete combustion but you shouldn't have soot.
If you go richer, you'll have soot too.