Diesel Engine Vs Petrol Engine

S.No	Diesel Engine	Petrol Engine
1.	These engines work on the Diesel cycle.	The petrol engine works on the Otto cycle.
2.	The fuel is mixed with air inside the cylinder.	Air and the fuel are mixed in a carburetor.
3.	Ignition is achieved with the help of fuel injector & hot compressed air.	Fuel is ignited with the help of electric spark.
4.	High compression ratio.	Relatively low compression ratio.
5.	High power production.	Relatively low amounts of power are produced in a Petrol engine.
6.	These engines work with fuels that have low volatilities.	Highly volatile fuels are used in these internal combustion engines.
7.	Generally used in heavy vehicles such as trucks and buses.	Used in light vehicles such as motorcycles and cars.
8.	In the diesel engine relatively low fuel consumption.	In the petrol engine high fuel consumption.
9.	High initial and maintenance costs.	Comparatively low initial cost and maintenance cost.
10.	The diesel engine have high thermal efficiency up to 40%.	The petrol engine have low thermal efficiency up to 25%.
11.	Occupies more space.	Occupies less space.
12.	Heavy in weight.	Light in weight.
13.	The fuel used in diesel engine is cheaper.	The fuel used in petrol engine is costly.
14.	Pre-ignition not possible.	Pre-ignition possible.
15.	More dependable.	Less dependable.