BlueStreak is right, 12.7 to 12.9...13.2 max
The 14:1 ratio is the IDEAL air fuel ratio at which fuel will burn its best, but in real life you are at the BORDER of detonation.
The 14:1 ratio is the IDEAL air fuel ratio at which fuel will burn its best, but in real life you are at the BORDER of detonation.