Bingo. You need to actually compress the mixture to help further gasify it so you can burn it as liquids don't burn in ICE's only the fraction that has been converted to a gas. If you can't do it on the compression stroke (help vaporize it) then you need to get it done as it leaves the carb, in the intake manifold and at the valve curtain area. Add to that the fact that modern street fuel has a much higher distillation temp then they require even more heat imputation to the fuel to convert it to a usable gas state.