What is the Main Difference Between Petrol Engine and Diesel Engine?

Petrol and Diesel engines are both Internal Combustion engines. Both are either four or two-stroke engines. Today in this article I will discuss the difference between Petrol Engine and Diesel Engine- 

Petrol Engine- 

A petrol engine is an internal combustion engine that uses petrol or any volatile fuel to produce power. It was first developed in 1876 in Germany by Nikolaus August Otto. Fuel motors turn at higher revolution speeds than diesel, somewhat because of their lighter cylinders, interfacing bars, and driving rod (plan effectiveness made conceivable by lower pressure proportions) and because petroleum consumes more rapidly than diesel. The cycle contrasts with a diesel motor in the technique for blending the fuel and air, and in utilizing flash fittings to start the ignition cycle. The petrol fuel needs a spark plug to ignite the fuel and produce the working stroke.

Diesel Engine- 



A diesel engine is a kind of gasoline-powered motor that utilizes pressure start to turn the energy in diesel fuel to revolving mechanical energy. A diesel motor works by utilizing cylinders to pack a combination of air (containing oxygen) with diesel fuel. At the point when this air is compacted at a proportion of around 15:1 the blend detonates driving the cylinder once again up and making the responding movement. The diesel motor acquires its energy by copying fuel infused or showered into the compacted, hot air charge inside the chamber. The air should be warmed to a temperature more prominent than the temperature at which the infused fuel can light. Fuel splashed into the air that has a temperature higher than the “auto-start” temperature of the fuel unexpectedly responds with the oxygen in the air and consumes it. Here no spark plug is used to ignite the hot charge. 


SL.No Diesel Engine Petrol Engine
01 The fuel is fed into the cylinder by a fuel injector and is mixed with the air inside the cylinder. The air and petrol are mixed in the carburetor before they enter the cylinder.
02 A diesel engine compresses only a charge of air and ignition is accomplished by the heat of compression. The petrol engine compresses a mixture of air and petrol which is ignited by an electric spark.
03 In a diesel engine, the compression is more than in any other engine In a petrol engine, the compression is lesser than in a diesel engine.
04 The diesel engine gives more mileage. The petrol engine gives less mileage compared to the diesel engine.
05 The diesel engine cylinder is fitted with a fuel injector. The petrol engine cylinder is fitted with a spark plug.
06 A diesel engine burns fuels of low volatility. Petrol engine burns fuel of high volatility.
07 The diesel engine works on a constant pressure cycle. Petrol engine works on a constant volume cycle.
08 Diesel engines are used basically in heavy vehicles. Petrol engines are used in comparatively light vehicles.
09 The fuel consumption is less. The fuel consumption is high.
10 Running cost is less Running cost is high.
11 Diesel is Heavier. petrol is lightweight.
12 Overhauling of the diesel engine is done after a long time. The petrol engine requires frequent overhauling.
13 Higher maintenance cost Less maintenance cost
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