Template:Motd/2015-02
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![](https://upload.wikimedia.org/wikipedia/commons/a/a6/4-Stroke-Engine.gif)
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.
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.
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![](https://upload.wikimedia.org/wikipedia/commons/6/68/Ararat_3d_version_1.gif)
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![](https://upload.wikimedia.org/wikipedia/commons/4/43/Bdna_cropped.gif)
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Cardan-joint_DIN808_type-D_w-arrangement_3D_animated.gif/300px-Cardan-joint_DIN808_type-D_w-arrangement_3D_animated.gif)
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/ImageNA.svg/300px-ImageNA.svg.png)
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/7/78/GRACE_globe_animation.gif/300px-GRACE_globe_animation.gif)
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