A comparison - Basic difference between a petrol engine and a diesel engine based on working, pressures, combustion, compression ratios, speed, efficiency, maintenance, and running costs. The following points are important for the comparison of petrol and diesel engine
The pressure at the end of compression is about 10 bar. | The pressure at the end of compression is about 35 bar. | |
The charge (i.e. petrol and air mixture) is ignited with the help of a spark plug. | ||
The combustion of fuel takes place approximately at constant volume. In other words, it works on Otto cycle.
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A petrol engine has compression ratio approximately from 6 to 10. | ||
The starting is easy due to low compression ration. | ||
As the compression ratio is low, the petrol engines are lighter and cheaper. | ||
The running cost of petrol engines is high because of higher cost of petrol.
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The running cost of diesel engines is low because of the lower cost of diesel. | |
The maintenance cost is less. | ||
The thermal efficiency is upto about 26%. | ||
Overheating trouble is more due to low thermal efficiency.
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These are high speed engines. | ||
The petrol engines are generally employed in light duty vehicles such as scooters, motorcycles, cars. These are also used in aeroplanes. |
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