Four Stroke Engines How does a canon work

Four Stroke Engines How does a canon work? 1

Engine Operation Gasoline & diesel engines convert chemical energy into mechanical energy 2

A Stroke… When the piston moves from TDC to BDC, or viceversa Ø TDC: Top Dead Center Ø BDC: Bottom Dead Center Ø Gasoline and diesel engines have to go through 4 strokes to create power to move the car

1 st stroke: Intake stroke Ø Ø the intake valve opens the piston moves down 4

Intake Stroke Continued… Ø As the piston moves down the cylinder… a mixture of gas and air enters the cylinder Ø this mixture is 15 parts air to 1 part gas (15: 1 air – fuel ratio) Ø the air & fuel is mixed & delivered by the fuel system – either a carburetor or fuel injection system Ø 5

2 nd Stroke: Compression Stroke Intake valve closes Ø Piston moves up the cylinder Ø When the piston reaches the top of the cylinder, the air & fuel has been squeezed to 150 psi Ø 6

3 rd Stroke: Power Stroke Øa spark created by the ignition system, jumps the gap at the spark plug & ignites the air/fuel mixture ØThis causes the burning gases to expand drive the piston down the cylinder 7

4 th Stroke: Exhaust Stroke Once the piston reaches the bottom of the cylinder from the power stroke… Ø Ø Ø The The exhaust valve opens piston moves up burnt gases are pushed out of the cylinder 8

Then what happens? After the exhaust stroke, the piston begins moving down on another intake stroke, continually repeating the 4 strokes 9

http: //auto. howstuffworks. com/engine 1. htm Lets watch one…