Okay, in militaries or as emergency backup in rural areas, multi fuel engines are used because of the ability to run on any fuel source such as diesel or kerosene.
How does such a engine work without the problems of running on different fuel sources such as engine knocking and spluttering (the classic trying to run petrol onto a diesel engine problem)…
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Usually by sacrificing efficiency and going simpler …
Modern engines have precise high compression, electronically controled fuel mixing and supply etc…
If you want to have simple reliable engine, look at garden tools. There are simple 2 or 4 stroke engines, that don’t need computer… They need carburator and spark plug.
If you scale it up and build it with better materials than cheap lawnmower, you get really tough engine, that can run on anything.
For example: I have German generator from ww2… It can run on gasoline, ethanol, diesel, jet fuel etc… But it consumes 20l/h and is extremely loud
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