Back during the 70’s, I remember some people were working on that idea by heating the gasoline in a sealed container to several hundred degrees and high pressure, and then spraying it into the cylinders. IIRC, it worked well but was too dangerous to actually use.............
I imagine it was.
Interesting that some drag racers cool the fuel to get more power by greater expansion inside the combustion chamber. Street rods often used an ice bath on the fuel line to increase power/speed.
erformance enthusiasts know that when it comes to engine air and fuel temperatures, colder is better. With that in mind we first introduced the first CO2-based fuel and air cryogenic super coolers for drag racing applications in 2003.
The CryO2™ system uses liquid carbon dioxide (CO2), stored at 80 degrees below zero (Fahrenheit), to super cool intake air, fuel, and even a vehicle’s turbo intercooler, resulting in more power and cooler engine combustion chamber temperatures.
http://www.designengineering.com/content/cryo2-cool-way-get-more-power
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Cool Fuel - Keep your fuel can in the shade, better yet, pack your fuel can in ice. (You can use the empty cooler since you and your friends drank all the beer the night before). As fuel vaporizes in the carburetor it has a cooling effect on the incoming air. Cooler air is denser and has more oxygen, the cooler the fuel is when it vaporizes the cooler the air will be and the more power it will make, plus the engine will run cooler also. In drag racing it is common practice to run the fuel line through a canister full of ice. Also the fastest drag race times are run on cold days because of the denser air.
http://www.lukesracing.com/luksr/tips.html
I suppose the biggest challenge would be to keep the vapor from exploding prematurely when it was pulled into a superheated combustion chamber.