5 important differences between diesel and gasoline:
1. Volatility: gasoline is volatile, diesel is not volatile.
2. Mixability with air: Gasoline is easy to mix with air. Diesel is not easy to mix with the air so that the diesel engine is prone to insufficient combustion. If the combustion is insufficient, some components are not burnt out, and black carbon particles are emitted, so the diesel engine exhaust is prone to black smoke and has a strong smell.
3. Contained energy: gasoline is lighter, and its components are smaller molecules. The molecules of hydrocarbon-based compounds contain about 8-10 carbon atoms, while diesel is 12-15. When burning, the more carbon, the better the combustion is. , the greater the energy released, so compared with the same volume of gasoline and diesel, diesel can provide higher energy.
4. Combustion method: gasoline molecules are relatively small, the active ignition point is low, the gasoline engine is mixed with an ideal proportion of air, compressed to about 10, and the spark plug ignites is an ideal state. Because of the high carbon content, diesel requires more air, and it is not easy to be ignited by the spark plug, so Use a compression ratio of 15 to 18 times to compress the diesel mixture (the temperature of the gas will increase after compression) to combustion
5. Emission characteristics: gasoline burns violently at high temperature, and partially burned compounds will dissociate at high temperature. The main emissions are carbon monoxide, hydrocarbons and nitrogen oxides. Diesel engines have more air in them, but because the mixing is not as good as gasoline, areas that are deficient in oxygen are prone to soot.