Both gasoline and diesel engines are 4 stroke Internal Combustion Engines, but both work in a different way. These 2 engines can be distinguished by the way they ignite the fuel. While gasoline relies on spark plugs to ignite the fuel, diesel can be self ignited due to the high temperature and pressure inside the combustion chamber.
Another difference between the 2 engines in the compression ratio. The compression ratio of gasoline engines is in the range of 6:1 to 10:1, and it can go up to 12:1 for higher octane gasoline. Diesel engine's compression ratio is between 16:1 to 20:1.
Petrol engines are quick burn engines, which result in faster combustion of the fuel and hence more power is generated compared to diesel engines. Diesel engines are slow burn engines and hence more time is taken to burn the fuel, resulting in higher torque than gasoline engines.
Air-fuel mixture can be sent in the suction stroke of gasoline engines, which makes it a homogeneous mixture engine. Air and diesel don't mix well at room temperature and hence cannot be sent together in the suction stroke of diesel engine, hence it is called heterogeneous mixture engine.
To know more about the working of both petrol and diesel engines, click the link below:
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