Diesel Engine and Petrol Engine: What’s the Difference?
Almost every vehicle around the corner uses a petrol or diesel engine. Most of the features in these engines are similar and function on internal combustion using a two or four-stroke cycle. Internal combustion generates power in four different phases that include: intake, compression, power, and exhaust.
In an easier language, in the Intake phase air enters the cylinder through the intake valve when it is open. In the next phase, the Compression phase, the intake valve is closed and the air is compressed with fuel. Now, this mixture of compressed air and fuel is ignited and it is called the Power phase. Due to this explosion, the piston comes down and drives the crankshaft to produce motion. In the final phase, the air-fuel mixture is expelled out of the cylinder through the opening exhaust valve and it is called the Exhaust phase. The cycle continues in repetition and generates momentum in the vehicle.
The basic difference between the diesel and petrol engines is that during the power phase, the petrol engine makes use of a spark plug to ignite compressed air and fuel. Diesel engines, on the other hand, rely solely on heavily compressed air.
If we think about it, both the engines work in the same way but the way of generating energy differs. In a similar way, there are some advantages of these engines and the advantage of engine 1 becomes the disadvantage of engine 2.
Advantages of Diesel Engine
- Diesel engines are more efficient when compared with petrol engines making it rich for vehicles like buses and taxis. Moreover, diesel as fuel is also cheaper than petrol which makes it much better fuel for the vehicles.
- Due to the efficiency of diesel engines, it is very easy to bring out better mileage from them. It helps in more time spent on travel and less time spent on refilling.
- As the diesel engines produce energy through heavily compressed air, they are designed extremely hard to handle all the pressure and eventually last longer than the petrol engines.
- Diesel engines can use alternative and renewable fuels such as biodiesel which makes them a better option than diesel engines.
But, even if there are advantages to diesel engines, there are some advantages to the petrol engine as well.
Advantages of Petrol Engine
- Diesel engines are built stronger due to which they also carry a lot of weight. They also cost a lot as compared to petrol engines due to which the vehicles with diesel engine variants are costlier than the petrol engine variants.
- Diesel engines generate a lot of power to build the momentum of the car due to which they create a lot of noise. This is the reason most of the passenger cars sport a petrol engine that makes less sound.
- Diesel engines are heavier which makes them an unsuitable choice for a sports car. That’s why sports cars are designed with a petrol engine.
- With diesel engine cars, it is all about power at first then speed but petrol engine cars offer speed and power at the same time.
Sarthak Moghe is a young, enthusiastic writer who loves modern technology and automobiles. After completing his graduation in Journalism and Mass-Communication, he stepped into the world of adulting as a content writer. When not busy on the keyboard, he likes to explore new topics and hone his sense of humour.