Gasoline engines use the compression stroke to release more energy on the power stroke. It isn't absolutely necessary for combustion. On diesel engines however, it is required.
@ Cosmic Muffin True, gasoline itself doesn't combust but it has a very high evaporation rate. The vapors mixed with air causes the combustion. This is the reason why so little fuel is needed per stroke. If the amount being injected is equal to the amount being vaporized and combusted then there is no reason to fear flooding. However too much or too little per stroke can result in flooding as too little would not ignite and collect beyond the ignition ratio while too much saturates the air to a point where there isn't enough oxygen to reach igniton.
I like the concept and I think it may be possible to use with other fuels, with a few modifications. I experimented with gasoline as a fuel once and I haven't found it very effective. It is not very powerful and is not clean burning. It doesn't seem like this design would work well without some kind of fuel compression.
Maybe you've had a bad experience with gasoline, but I have found, after some testing, that gas is actually a very good fuel. There may be carbon buildup after a while but for a seal that is a good thing. You could also try something of a higher octane or alcohol based. Those typically burn cleaner at lower pressures.
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