PETROL ENGINE
 Why choose a petrol engine?
Well, it produces a lot of power for its size and weight and delivers power for a long time on a small volume of fuel.
But on the down side…It produces harmful gases through its exhaust and it's hard to control electronically inside a robot.
How does it work?
The power the engine provides comes from burning petrol. There are many types of engine but the simplest is called the two-stroke engine.
 Click here to see real media clip
On the upward stroke, fuel and air are sucked into the cylinder. The final part of the upstroke squashes, or compresses the fuel-air mixture. The mixture is ignited by a spark plug and as it burns it expands rapidly, pushing the piston down with great force. The final part of the downstroke pushes the waste gases out of the cylinder.
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