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actually there IS such a thing as a "perfect ratio", it IS I think what was stated on that bid thing....it's precicely the amount needed under optimimum conditions to completely burn gasoline completely, just H2O, CO2 and something else I can't remember as by products....no CO...
BUT, you can't always run at 14.7:1 air/gas ratio because of various reasons, not the least of which there's no such thing as the optimum conditions. your engine controller will always vary it according to engine speed/temperature/etc.
so that thing COULD force the engine to always get 14.7:1 air/gas ratio, but if that the engine runs at all after it's installed, I'd be shocked.
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