What is the fundamental difference between a diesel engine and a gasoline engine?

What is the fundamental difference between a diesel engine and a gasoline engine?

First of all, the diesel engine works in the same way as the gasoline engine. Each work step goes through four strokes of intake, compression, work and exhaust. However, the fuel of diesel engines is larger than gasoline and is not easy to evaporate, but the auto-ignition temperature is lower than that of gasoline, so the ignition mode of diesel generators is different from that of gasoline engines.

Compared with gasoline engines, diesel engines have low fuel consumption rate (on average 30% lower than gasoline engines), and diesel fuel prices are lower, so fuel economy is better; while diesel engines generally have lower rotational speeds than gasoline engines, and the torque is larger than that of gasoline engines. However, its quality is high, noise is high during work, manufacturing and maintenance costs are high, and emissions are also worse than gasoline engines. But with the development of modern technology, these shortcomings of diesel engines are gradually being overcome.

Horsepower

A big difference between diesel and gasoline engines is the different injection steps. Most automotive engines (gasoline engines) use port injection or use a carburetor instead of direct injection. Therefore, inside the automobile engine, all of the fuel is injected into the cylinder during the intake stroke and then compressed. The compression of the mixture of fuel and air limits the compression ratio of the engine, because if the air is excessively compressed, the mixture of fuel and air will self-ignite and cause knocking. The diesel engine only compresses the air, so the compression ratio is much higher than that of the gasoline engine. The higher the compression ratio, the greater the horsepower generated.

Diesel

   If you compare diesel to gasoline, you will find that they are different. They smell differently. Diesel is heavier and oily. Diesel vaporization is much slower than gasoline, and in fact its boiling point is much higher than the boiling point of water (Water Temperaure Sensor).

   Because diesel is heavier, evaporation is slow. It contains more longer carbon chain chains than gasoline (gasoline is generally C9H20, while diesel is generally C14H30). There are fewer refining processes when producing diesel, so diesel is cheaper than gasoline. Diesel has a higher energy density than gasoline. On average, 3.8 liters of diesel contains about 155 x 106 joules of energy, while 3.8 liters of gasoline contains 132 x 106 joules. This advantage combined with the higher efficiency of the diesel engine illustrates the reason why the diesel engine has a lower mileage than the gasoline engine.

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