Compare Petrol and Diesel engines?

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Manickam V

Petrol spark ignition diesal compression ignition
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1. The diesel engine work on diesel cycle. The petrol engine works on Otto engine. 2. In this engine Diesel is used as fuel which is a non-volatile fuel. In this engine petrol which is a high volatile fuel is used as fuel. 3. In the diesel engine the air is sucked during...
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1. The diesel engine work on diesel cycle. The petrol engine works on Otto engine. 2. In this engine Diesel is used as fuel which is a non-volatile fuel. In this engine petrol which is a high volatile fuel is used as fuel. 3. In the diesel engine the air is sucked during the suction stroke and the fuel is injected into combustion chamber thru injector. In the petrol engine the air-fuel mixture sucked during the suction stroke. 4. The ignition is due to the heat generated during the compression stroke by the high compressed ratio. So it is called compression ignition (CI) engine. The spark is generated by the spark plug into the combustion chamber so the ignition is due to the spark by external source so it is called spark ignition (SI) engine. 5. Due to high compression ratio it have large vibration so it develop more noise. Due to less compression ratio it has small vibration so it develop less noise. 6. To handle the high compression ratio it has heavy metal so it is heavier than petrol engine. It has low compression ratio so they are light in weight. 7. This engine used injector to inject the fuel in combustion chamber. This engine used spark plug to ignite the fuel in the combustion chamber. 8. Due to heavy weight and also due to heterogeneous combustion, they are low speed engines. Due to light weight and also due to homogeneous combustion, they are high speed engines. read less
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