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Attempting to vaporize gasoline before it even reaches the carburettor is not so great at all. You know, a carburettor is already meant to switch the gasoline (or ethanol) from liquid phase to vapour phase, as the fuel takes heat directly from the intake air, so a fuel already hot enough at the vapour phase would basically take no heat from the intake air, leading you to eventually need to run richer in order to prevent knock. Well, maybe if some of the already vaporized fuel could replace in volume some of the air flow, possibly it could act like said enrichment to prevent a knock, but most likely it would decrease performance too.
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