Gasoline engines always run on vapor, that's how they work.
I think they normally run on a mist (fine droplets) not a vapor (gas).
They run on a gas. That's why they a choke. When the engine is cold the fuel doesn't vaporize, so you need a higher fuel/air mixture. Once the engine is warm enough the fuel droplets from the carburetor/injection are vaporized in the intake and so the air/fuel mixture can be turned down. Direct injection engines vaporize the fuel in the cylinder itself. Direct injection engines have to modify the injection pattern when the engine is cold.
Once the engine is warm enough the fuel droplets from the carburetor/injection are vaporized
Ahhh. Someone else said that the approach in the video is basically a high air-fuel ratio mode of running, which agrees with your model where more fuel is required when its surface area will be lower (when cold and it's not vaporizing the droplets).
Direct fuel injection engines definitely spray in liquid. Obviously it doesn't stay a liquid but I would say what it runs on is based on whatever gets fed into the piston, or any part that is directly a part of the engine.
It isn't shocking though as you can run a gas engine on propane. I wouldn't do it with a modern one that has tight tolerances, but for most engine formats until its been optimized to the edge of breaking you can use propane.
Yep, and did you know that temperature is absorbed before combustion? That is because it requires energy to break the bonds in the air fuel mixture. That absorbs heat, after the bonds are broken they re-form, and release the heat and ionized gas via IR radiation we associate with combustion. When fuel is liquid, the hydrogen bonds are too hard to break, but when fuel vaporizes the bonds become easier to break.
Now do diesel
It's the same, except ignition happens via compression and fuel injection alone. Diesel engines use much higher fuel pressure to improve atomization.
I had no idea. What a great explanation,thanks.
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