What happens if we put Gasoline instead of diesel in diesel engine:- Otto and diesel cycle

                            Both fuels gasoline and diesel are hydrocarbons. The only difference being the length of the hydrocarbon chain, diesel being longer. Gasoline is lighter and less viscose than diesel, Gasoline vaporizes more readily than diesel at room temperature. This makes gasoline a bit more dangerous because it easily creates enough concentrated vapors that are easy to ignite into the fire. Diesel is somewhat better in lubricating things than gasoline.



                            In the engine, Fuel is well mixed with air and burned. Therefore we have to say something about air-fuel mixture properties; the diesel mixture will ignite at a lower temperature than the gasoline-air mixture. the gasoline-air mixture can simply withstand higher temperatures before self-ignition. This is a very important thing to remember. It is also a bit confusing. By the result of the experiment, it seems that the gasoline will much easier to engage in flame than the diesel. But remember that this is only because the gasoline vaporizes more readily at room temperature. It means that, at room temperature, there is a much higher concentration of gasoline vapors than diesel vapors and therefore gasoline will ignite more easily. However, when we talk about the same concentrations of gasoline and diesel vapours, then the diesel will ignite easier but a lower temperature is needed to activate combustion. Inside the engine, the temperature is high enough for both, the gasoline and the diesel to vaporize completely and create rich enough concentration of vapour.



                             Mister Rudolph diesel was aware of the gasoline engine problems and wanted to improve it. The gasoline engine inherently has problems with efficiency and fuel. In order to improve efficiency, one must increase the compression ratio of an internal combustion engine. However, in the gasoline engine, there is the limit, the gasoline-air mixture will self ignite once the compression gets too high. So, either you can have a low compression engine that uses a cheap fuel, or you can have a highly efficient, high compression engine that uses expensive, high refined fuel that won't self ignite even at high compression levels. In a diesel engine, this problem is solved. The diesel engine can use much higher compression levels than the gasoline engine reaching higher efficiency. In addition, the diesel engine can use fuel that is not nearly as refined as the high octane gasoline fuel. To make this possible, Rudolph changed the Otto cycle and created the diesel cycle. The difference is that during the compression phase, no fuel is present in the cylinder and thus no self-ignition can happen. The fuel is only injected at the moment the ignition is wanted, when injected into the hot pressurized air the diesel fuel self ignites immediately. 



                               The diesel fuel is better for a diesel mortar because it self ignites more readily, and this is desirable in the diesel cycle. If we try to inject gasoline instead of diesel into the diesel engine, this may not work because gasoline, having a much higher self-ignition temperature, may not ignite at all. If we build the diesel engine to have a really, high compression ratio then even the 120 octane gasoline (methane) will self ignite and our engine will be able to work with almost anything we put in our tank.

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