Globally, there are two types of engines in general - diesel engines and petrol engines. The classification is based on the fuel used for the engines, as the design, functionality and characteristics of the engines vary depending on the type of fuel to be used. These engines are available in cars, aircraft and even in commercial generators. Therefore, it would be worth spending some time and checking out the reason behind a motor's preference over the other.
To get a deep understanding of the topic in this article, it would be helpful to have a passion for things under the forehead. But in any case, the material has been represented in such a way that a person with little or no knowledge of mechanical engineering will also be able to follow; Little physics in your high school or high school is enough. To begin with, let us try to understand the working principle of the two types of engines, so that we can conclude behind the popularity of one type over the other.
Working principle for diesel engines
A diesel engine is generally referred to as a CI (compression ignition) engine. In a diesel engine, the air of the pistons is compressed in a closed chamber with a process called adiabatic compression. Due to severe compression, the temperature of the air rises to very high levels inside the chamber. After reaching sufficient temperature, the fuel, which in this case is diesel, is slowly injected into the chamber in a controlled manner.
When the flammable fuel comes into contact with the hot air, it starts to burn. The gas produced from the combustion pushes the piston downwards, which in turn provides the required torque. Due to its design features, it has a very low residual fuel and even the excess heat is easily diverted, making the engine very suitable for long hours maintenance-free operations under heavy loads. Among all types of internal combustion engines, diesel engines have the highest efficiency, sometimes more than 50%.
Working principle for gasoline engines
Gasoline engines, on the other hand, are an internal combustion engine with a completely different working principle. Inside a gasoline engine, fuel and air are mixed in a chamber and gradually compressed. In addition, a spark plug is used to provide the necessary ignition point for the mixture, so that the whole process becomes fast and stable. Due to the presence of the spark plug, gasoline engines are used strongly in cold countries where the ambient temperature is very low and it is very difficult to keep the temperature of the mixture suitable for combustion only by compression.
Also, the petrol engine speed is higher than and its parts are brighter than its diesel engine parts, making it the perfect choice for fast acceleration and high speed maneuvers. However, the compression ratio of the fuel-air mixture is quite low for a gasoline engine and it results in a lower efficiency of gasoline engines compared to diesel engines.
Which is the better choice?
Yes, it depends on the use. Experts recommend petrol engines for cases that require very high speed and high acceleration. Historically, diesel engines are noisier than petrol engines and people associate it with nasty smoke coming out of the exhaust. But the fact is that carbon dioxide emissions from gasoline engines are higher than diesel engines.
Diesel engines are a better choice because of many factors such as:
- The cost of diesel is lower than for gasoline in most countries in the world.
- Diesel engines last longer because of robust construction.
- Efficiency and maintenance costs are a major determinant of choice.
- At low speeds, diesel engines can generate very high power. This is the ideal case for commercial and industrial applications.
Because of all these reasons, it has also been observed that machines with diesel engines receive higher resale values. Studies have shown the fact that using diesel cars and used diesel generators generates more inquiries when they are set up for resale. However, it is strongly recommended to consult a domain expert to determine which engine to buy for your needs.