Assignment quations
Stroke ------------ movement of the Piston ------------ position of the valve purpose
intake stroke
Comperession stroke
power stroke
Exhaust strokes
1. In the intake stroke, what is the purpose of the movement of the piston, and what is the expected position of the valve?
2. How is the movement of the piston different in the compression stroke than it is in the other strokes, and what is the purpose of this difference?
3. What happens during the power stroke that makes it different from the other strokes?
4. In the exhaust stroke, what is the expected position of the valve and what is the purpose of this stroke in the overall function of the engine?
5. How do these four strokes work together to create the necessary combustion and movement in a typical engine?
Stroke: In the context of an engine, a stroke refers to the movement of the piston within the cylinder.
Intake stroke: During the intake stroke, the piston moves downward, creating a vacuum within the cylinder. As a result, the intake valve opens, allowing a mixture of air and fuel to enter the combustion chamber.
Compression stroke: In the compression stroke, the piston moves upward, compressing the air-fuel mixture within the combustion chamber. Both the intake and exhaust valves are closed during this stroke.
Power stroke: The power stroke is when the ignited air-fuel mixture combusts. As the spark plug sparks, it ignites the compressed air-fuel mixture. The expanding gases from the combustion force the piston downward, converting the thermal energy into mechanical energy.
Exhaust stroke: Following the power stroke, the piston moves upward for the exhaust stroke. This upward movement pushes the exhaust gases out of the cylinder through the open exhaust valve. The exhaust stroke completes the four-stroke internal combustion engine cycle.
Position of the valve purpose: The positions of the intake and exhaust valves are crucial in regulating the flow of air and fuel into and out of the combustion chamber. The intake valve ensures the correct amount of air and fuel enters the chamber during the intake stroke. The exhaust valve allows the expulsion of the combustion byproducts during the exhaust stroke. Proper valve timing ensures efficient engine operation.