That is the stroke that gives us the power from this engine. And the third stroke is the power stroke. The first stroke is intake, the second stroke is compression - compression. This mixture and this flame front travels all the way and burns all this fuel and this fuel reaches very high temperatures and it pushes the piston all the way down. When this mixture is compressed to the predetermined pressures, at that time, the spark plug ignites. Roughly about 8 times to 9 times and this piston moves back up here and again we have to spend energy to move this piston up or compress this mixture here. And the second stroke now, the second step is we close both of these valves and push this mixture this mixture is again, by pushing the piston up, this mixture that is in here is compressed. This is a four stroke engine that we are talking about. When we push this down, the fuel and air mixture is basically sucked in and it fills up this entire wall unit as this piston comes down. This acts like a syringe, a medical syringe. And this fuel and air mixture comes in as this piston is pushed down. So the first step is to bring the fuel and oxidizer or air inside the mixture. Now let's see in sequence what happens in this cylinder. And when the fuel and air mixture is inside, this spark plug provides a spark to ignite the mixture.
And there is another outlet here, that takes out the exhaust gases and there is another valve that opens and closes at appropriate times. And this is a valve that opens and closes. One inlet is for fuel and oxygen, fuel and air to come in and mixture. And this piston is what moves up and down and we have two inlets. This is basically one cylinder that we have and these are the walls of the cylinder and this is the piston that we have. From this diagram we are going to learn how, basically, an automobile engine works.
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