| 1 | In this engine, Combustion starts due to Sprays the fuel into compressed air. | In this engine, Combustion starts due to the spark plug produces spark in Air-Fuel Mixture. |
| 2 | In this engine, Diesel is used as fuel. | In this engine, Petrol is used as Fuel. |
| 3 | Spark Plug is Absent. | Spark Plug is Present. |
| 4 | The Compression Ratio is High. | Compression Ratio is Less. |
| 5 | Less Fuel Consumption as compared to Four Stroke Petrol Engine. | More Fuel Consumption as compared to Four Stroke Diesel engines. |
| 6 | Cost of Four Stroke Diesel Engine is High. | Cost of Four Stroke Petrol Engine is High as compared to Four Stroke Diesel Engine. |
| 7 | More maintenance costs. | Less maintenance cost. |
| 8 | Application Of Four Stroke Diesel Engine:- Bus, Truck (Heavy-Duty Vehicles). | Application Of Four Stroke Petrol Engine:- Two-wheeler, Car (Lightweight Vehicles). |
| 9 | It works on Diesel Cycle. | It works on Petrol or Otto Cycle. |
| 10 | Fuel mixes with air inside the combustion chamber. | Fuel mixes with air in carburettor before going to the combustion chamber. |
