Petrol Engine | Diesel Engine |
1. The petrol engine works on Otto cycle | 1. Diesel engine works on diesel cycle. |
2. Petrol engine are spark ignition engine. | 2. Diesel engine are compression engine |
3. The power developed in petrol engine is low due to lower compression ratio. | 3. In diesel engine the power developed is more due to higher compression ratio. |
4. A spark plug is required | 4. A spark plug is not required. |
5. The cost of petrol is comparatively high. | 5. The cost of diesel is comparatively less |