Difference between Diesel Engine and Petrol Engine in Tabular Form

The basic difference between diesel engine and petrol engine is that Diesel engine draws air during suction stroke, low-speed engine and costly than a petrol engine, while petrol engine draws a mixture of petrol and air and are high-speed engines.

Diesel Engine properties

• Diesel engine only draws air during suction stroke.
• The fuel is injected in the form of fine spray.
• Combustion of fuel takes place at constant pressure.
• The diesel engine is heavier and costlier.
• Starting of the diesel engine is difficult due to the high compression ratio.
• The maintenance cost of it is large.
• They are low-speed engines.
• They are generally employed in heavy-duty vehicles.

See more topics: Thermodynamics

Petrol engines properties

• They are high-speed engines than diesel engines.
• They draw a mixture of petrol and air.
• The charge is ignited with plug.
• Starting of a petrol engine is easier than the diesel engine.
• They have a low compression ratio.
• In petrol engines combustion of fuel take place at constant volume.
• They are generally employed in light-duty vehicles.
• Running cost is high.

Difference between petrol and diesel engine (video)