The difference between petrol engine & diesel engine can be carried out with various parameters as follows

Sr. No.	Petrol Engine (SI)	Diesel Engine (CI)
1. Suction stroke	Petrol engine takes a mixture of air & petrol	A diesel engine takes only air during suction stroke
2. Fuel Mixing	The carburettor is used to mix air & petrol	An injector or atomizer is used to inject fuel at end of the compression stroke.
3. Pressure at end of the compression stroke	Pressure is about 10bar	Pressure is about 35 bar
4. Fuel Ignition	Ignited with the help of Spark Plug	Fuel-injected is sufficient to ignite the compressed air
5. working Cycle	Constant volume (Otto) cycle	Constant Pressure (Diesel) cycle
6. compression ratio CR	The petrol engine has 6 to 12	The diesel engine has 10 to 24
7. Engine Starting	Easy due to low CR	Difficult due to high CR
8. Running cost	High due to the high cost of Petrol	Low due to less cost of diesel
9. Maintenance Cost	Less	High
10. Engine Weight	Lightweight	More weight
11. Thermal Efficiency	About 24%	About 40%
12. Engine speed	High	Low
13. Life span	Less	More
14. Overhauling requirement	Frequent overhauling required	Overhauling is done after a long time
15. Maximum temp inside the cylinder	The temperature reaches up to 1100 deg C	The temperature reaches up to 2600 deg C
16. Application	Scooter, bikes, cars, etc	Trucks, buses, tractors, etc

See the Difference between Two-Stroke & Four-Stroke Engine HERE

@harkegaurav

Pages