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Difference Between Diesel Engine And Petrol Engine ? | Explained in Tamil

1,912 views · Published 13 January 2018 · 2:24 · Indexed 23 October 2026

Channel: Electrical Pattarai · 2018 · Education

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Difference Between Diesel Engine And Petrol Engine ? | Explained in Tamil
Difference Between Petrol and Diesel Engine
The petrol engine works on Otto cycle whereas diesel engine works on diesel cycle.
In petrol engine the air and petrol are mixed in carburetor and it enters into the cylinder. In diesel engine the fuel is first fed into the cylinder by a fuel injector and then gets mixed with air inside the cylinder.
In petrol engine first the compression of air and petrol is done and then it is ignited by an electric spark. In diesel engine only the charge of air is compressed and ignition is done by the heat of compressed air.
The compression ratio in petrol engine is low as compared with the diesel engine.
The power developed in petrol engine is low due to lower compression ratio. In diesel engine the power developed is more due to higher compression ratio.
Petrol engine is fitted with spark plug whereas diesel engine is fitted with a fuel injector.
In petrol engine the fuel that burns has high volatility. In diesel engine the fuel of less volatility is burnt.
Petrol engines are used in light weight vehicles like car, motorcycles, scooters etc. Diesel engines are used in heavy vehicles like buses, trucks, locomotives etc.
Fuel consumption in petrol engine is higher than the diesel engine.
Petrol engine is lighter whereas diesel engine is heavier.
Frequent overhauling is required in petrol engine but overhauling of diesel engine is done after a long time.
There is lesser starting problem in petrol engine as compared with diesel engine.
Petrol engine has lowered initial and maintenance cost but the initial and maintenance cost of diesel engine is high.
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