Comparison of Differences Between Four Stroke Diesel Engines and Gasoline Engines

Most diesel engines are four-stroke, and some are two-stroke structures. Diesel engines work very similar to gasoline engines. There are many components on a diesel engine that are the same as a typical gasoline engine. A big difference between a diesel engine and a gasoline engine is that the diesel engine has a higher compression ratio. The diesel injection system uses high pressure injection, while the gasoline engine uses low pressure. fuel injection system.

 

       Most diesel engines are four-stroke, and some are two-stroke structures. Diesel engines work very similar to gasoline engines. There are many components on a diesel engine that are the same as a typical gasoline engine. A big difference between a diesel engine and a gasoline engine is that the diesel engine has a higher compression ratio. The diesel injection system uses high pressure injection, while the gasoline engine uses low pressure. fuel injection system. The following Dingbo Power will introduce the difference between four-stroke diesel engine and gasoline engine for you.

 

       1. The intake air of a gasoline engine is a mixture of air and fuel, while a diesel engine only absorbs air during the intake stroke.

       2. Because the compression ratio of the gasoline engine is low, the compression pressure is small and the compression temperature is also low.

       3. The mixing point of air and fuel in a gasoline engine is done at the carburetor or by the injector, while the mixing point in a diesel engine is at, near or a little before top dead center (TDC).

       4. The combustion of gasoline engine is caused by spark plug, while diesel engine is compression ignition.

       5. Gasoline engines produce about 460 psi on the power stroke, while diesel engines produce close to 1200 psi on the power stroke. Diesel engines produce more energy than gasoline engines.

       6. The exhaust temperature of gasoline engines is much higher than that of diesel engines, because some gasoline is still burning during the exhaust stroke. The exhaust gas of gasoline engines is also high in carbon monoxide.

       7. A major disadvantage of diesel engines is the high emission of nitrogen oxides (NOx). Because of the higher internal temperature, diesel engines produce more nitrogen oxides than gasoline engines. Nitrogen oxides are considered greenhouse gases (gases that cause a slight increase in atmospheric temperature, making our environment greenhouse-like), and nitrogen oxides are also one of the main gases responsible for photochemical smog, although engine manufacturers are constantly Improvements to reduce emissions.

       8. The efficiency of diesel engine is about 10% higher than that of gasoline engine. The reason is that diesel engines have a higher compression ratio and 1 gal of diesel contains more energy than 1 gal of gasoline.