Originally Posted by EngineeringNick
...alternately, I was looking to see if anyone had tried to modify the fuel injection process to inject vapor from the get-go instead of trying to spray a mist to get to the same result...
No, not even the manufacturers with virtually unlimited resources and knowledge have successfully done it, and it probably has to do with Boyle's Law and the vapor pressures of hydrocarbon compounds.
Gasoline is a "middle of the barrel" product and contains a range of hydrocarbons, mostly C4-C12. In any event, they all remain liquid at typical ambient temperatures on earth, with some negligible loss at higher temps. Take the charge volume of a typical fuel injector, vaporize it (how to do this is "left to others"), and what do you have...probably a fraction of a cubic foot (I have no idea, and I'm not doing the calculation). Imagine trying to get that fuel vapor charge into a typical cylinder displacement once you've added enough air to get a stoichometric ratio for combustion.
Well, if you raise the pressure ENOUGH...No, wait a minute here, are we talking about injecting the fuel charge UPSTREAM of a supercharger!?
Not exactly something which the NHTSB will endorse. But, theoretically
, maybe it would then all squeeze into a volume expanding and contracting 5000 times a minute. No, wait, if you raise the charge pressure, then the gasoline will just go back toward a liquid state...and you're right back where you started.
No, Nickster, I think you need to apply some of that engineering training you received and do some thinking of your own instead of barnstorming and throwing out crap ideas for us to think about.
Then there's always liquid hydrogen and liquid oxygen...uh, no, that's already been done, but it was the Saturn V. The astronaut said he was literally sitting on the tip of a bomb, and he was right. Brave guys.
(Edit: Oops, should have fact-checked before I spoke...the first stage Saturn V fuel was actually a form of kerosene with liquid oxygen as the oxidizer, so liquid hydrogen IS still on the table.