Why Are Diesel Engines Desirered Over Petrol Engines?

Globally, two types of engines are generally found – diesel engines and petrol engines. The classification is done primarily based on the fuel used for the engines, because the development, functionality and options of the engines differ on the type of fuel to be used. These engines will be present in cars, airplanes and even in commercial generators. Due to this fact, it would be worthwhile to spare a while and have a look into the reason behind the preference of one type of engine over the other.


With the intention to have a deep understanding of the subject material of this article, having a passion for the stuff under the bonnet can be helpful. But in any case, the material has been represented in such a way that an individual with little or no knowledge about mechanical engineering can even be able to observe; a bit of physics in your center school or high school will suffice. To start with, let us try to understand the working principle of the 2 types of engines, so that we can infer the reason behind the popularity of one type over the other.

Working precept of diesel engines

A diesel engine is usually referred to as CI (compression ignition) engine. In a diesel engine, air is compressed by the pistons within a closed chamber by a process called adiabatic compression. Because of severe compression, the temperature of the air rises to very high levels inside the chamber. After achieving adequate temperature, the fuel, which in this case is diesel, is slowly injected into the chamber in a managed manner.

When the inflammable fuel is available in contact with the new air, it starts burning. The gas produced from the combustion pushes the piston downwards which in flip produces the torque required. Due to its constructional options, it has very low leftover fuel and likewise the excess heat is dissipated simply, making the engine very suitable for prolonged hours of upkeep free operation under heavy loads. Amongst all of the types of Internal Combustion engines, diesel engines have the highest rate of effectivity, generally more than 50%.

Working principle of petrol engines

Petrol engines, on the other hand, is an Inner Combustion engine with an entirely totally different working principle. Inside a petroleum engine, fuel and air are blended in a chamber and compressed gradually. Additionally, a spark plug is used to provide the mandatory ignition point for the mixture, in order that all the process turns into quick and steady. Due to the presence of the spark plug, petrol engines are highly used in cold countries where the ambient temperature is very low and it may be very tough to maintain the temperature of the mixture suitable for combustion only by means of compression.

Also, the velocity of petrol engines is higher than and its components are lighter that of its diesel counterparts, making it the ideal choice for quick acceleration and high-velocity maneuvers. However, the compression ratio of the fuel-air mixture is quite low for a petrol engine and it results in a decrease effectivity of petrol engines as compared to diesel engines.

Which is the higher alternative?

Well, it relies on the nature of use. Specialists suggest petrol engines for cases that want very high speed and high acceleration. Additionally, historically diesel engines are noisier than petrol engines and folks associate it with nasty fumes popping out of the exhaust. However the reality is that carbon dioxide emission from petrol engines is higher than that of diesel engines.

Diesel engines are a more sensible choice as a consequence of many factors like:

Price of diesel is lower than that of petrol in many of the international locations within the world.

Diesel engines last more because of rugged build.

Efficiency and maintenance price is a good deciding factor for the selection to be made.

At low speeds, diesel engines can generate very high power. This is the perfect case for commercial and industrial applications.

As a consequence of all these reasons, it has additionally been noticed that machines using diesel engines get higher resale values. Surveys have proved the truth that used diesel cars and used diesel generators generate more enquiries when put up for reselling. However, it is strongly advised to consult a domain professional to determine which engine to purchase in your requirement.

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