Bruce ( Shrinker )

Hysteric said

This statement from Heywood for me is profound: "It also suggests that cycle by cycle variations in the position and growth rate of the flame kernel at very early times are the very cause of the cycle by cycle fluctuations in the pressure curves for spark ignition engines."

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yes absolutely.
CO production and the amount of it thats left over from the previous bang effects the flame kernal immensely.
Homogenization is key to reduce cycle to cycle variations and the fuel has to be gassed so you can homogenize it.
When you are tuning an engine you are tuning the pressure wave.You want this to be as constant and predictable as you can get it.this is what gives smooth power and smooth lines on graphs.