This animation illustrates the processes inside a four-stroke petrol engine.
It serves as a basic introduction to four-stroke petrol engines.

Description of the Animation
1. Intake: The valves open. The piston moves downwards. The resulting partial vacuum draws air and fuel into the cylinder, where they mix to form a combustible charge.
2. Compression: The valves are closed. The piston moves upwards. This increases the pressure and temperature inside the combustion chamber.
3. Combustion: Shortly before the piston reaches the top dead centre, the fuel-air mixture is ignited by the spark plug. The fuel-air mixture burns from top to bottom. The flame front reaches the piston and drives it downward.
4. Exhaust: The fuel-air mixture is completely burnt. The valves open again. The piston moves upwards. The combustion gases are expelled.
Requirements
| Platform | PC/Mac or tablet |
| Resolution (min) | 1280 x 720 |
Contributors
C. Hein, S. Rikowski
References
- Idea and initial concept: Tamara Riehle
- Technical drawing of the motor: based on Ulrich Rapp (http://www.ulrich-rapp.de/stoff/fahrzeug/motor/index.htm)
- Authoring tool: Adobe Animate
Further information
The GUI elements used in this animation are published under the MIT license:
I want more explanation about petrol engine and it’s part with their functions