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Old 07-18-2016, 12:12 PM   #11 (permalink)
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The expansion ratio of gasoline when it turns to vapor is around 150:1... Therefore if you had your gas so hot that it was vapor, you'd need so much vapor that there would not be any room for air!

Another fact to consider is that most injectors spray right at the back side of the valve. which, in a running engine is extremely HOT, therefore it gets vaporized anyways. Higher pressure, with shorter and later timed injector pulses could possibly help get the fuel in without displacing as much air. maybe the opposite of vaporising it!

You'd be better off focusing on increasing the compression ratio with a very tight and well designed quench/swirl. In order to get the most out of the fuel that is already going into the motor. think quality of combustion, not quantity.

Have you ever taken a water hose and spun a bike tire or a pinwheel? the hose doesn't do much if you point it right at the side. You need to put the water flow with the rotation! modern engines, and some crafty racers from bygone times figured out that you need to aim your combustion as well to get the most out of it.

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Old 07-18-2016, 03:33 PM   #12 (permalink)
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Gasoline engine burn air and gas at ratios between 12:1 to 15:1 by weight. So there is plenty of room for the air.
A propane engine's fuel is fully vaporized and they don't have any problems like this.
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Old 07-20-2016, 12:04 AM   #13 (permalink)
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Just heat the fuel that much more! What could possibly go wrong?!
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Old 07-20-2016, 02:30 AM   #14 (permalink)
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I don't think heating the fuel will make much if any difference during normal operation.
The reason I am doing it is for when its like 10'F out side and I need to get my old carbureted pig going.
That way I can heat the fuel so it vaporizes better when its real cold out and so I can keep the density of the gasoline closer to what it is in the summer time. Since I am running carbureted the fuel density effects the mixture.
The density between cold and warm fuel is only between 1 and 2% but the more variables I can get rid of the better.


Most of that doesn't apply to fuel injected.

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