I do not think diesel engines use spark plugs because there is a mixture of air and uncoated fuels like besin. Diesel engines have a high compressor ratio (close to 20) of decompression water in the cylinder due to high air temperature, then no need to use a gasoline engine plug you can spray fuel into the air intakes. Air will fill the cylinder, while the compression ratio as high as your diesel engine gunaka, then there will be an explosion. Then the spatios are lower than and that's where you need the spark plug to turn it on when you compare the two engines with the same compression ratio, the gasoline engine is superior or efficient (with a ratio of 10/15). It is possible to make a gasoline engine with a ratio of 15. If you have mastered the injection in the gasoline engine as well, it will press the piston head of the fuel gasoline mixture at 1200 ° C, while the diesel at a temperature of 800 ° C is a big difference plus there will be very high .

But a blue collar scientist gives a simple explanation: when a higher compressed diesel engine will negate the ignition system, its mechanical prisnsip is to press the atmosphere 2 to 3 times higher than the gasoline engine, can create a microclimate and a high temperature temperature until it will enter atomic fuel to create combustion and rapid expansion. Diesel engines can take advantage of various types of fuel. Rudolph  Diesel is an inventor of diesel materials that utilizes local vegetable oils as a fuel source. This is the first tool to heat the air before the engine reaches the operating temperature
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