Template:Motd/2015-02-07 (en)

Animated scheme of a four stroke internal combustion engine, Otto principle:
1. Suction stroke - Air and vaporised fuel are drawn in.
2. Compression stroke - Fuel vapor and air are compressed and ignited.
3. Power stroke - Fuel combusts and piston is pushed downwards.
4. Exhaust stroke - Exhaust is driven out.

 Template:Motd/2015-02-07

This is the English translation of the Media of the day description page from 7 February 2015.

Descriptions in other languages:

• Motd/2015-02-07 (cs)
• Motd/2015-02-07 (en)
• Motd/2015-02-07 (zh-hans)