The Heart of the Automobile

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Presentation transcript:

The Heart of the Automobile The Four Stroke Engine The Heart of the Automobile

Engine Operation

Four-Stroke Cycle

The First Stroke (also called intake stroke) intake valve open camshafts gas/air mixture The downward moving piston draws a mixture of air and gasoline vapor into the cylinder. Piston Piston is moving down Crankshaft

The Second Stroke (also called compression stroke) Intake and exhaust valves are both closed The piston moves up, compressing the gas/air mixture. During this stroke, notice that both the intake and exhaust valves are closed. Piston is moving up

The Third Stroke (also called combustion stroke) Spark Plug Just before the piston reaches the top of the cylinder a spark from the spark plug explodes the fuel mixture. This pushes the piston down and drives the crankshaft around. Piston is moving down

The Fourth Stroke (also called exhaust stroke) The piston moves up and pushes the burned gases out through the exhaust valve. Next, the piston moves down again, and pulls more gas/air mixture in to begin the cycle again. burned gas out Piston is moving up exhaust valve open

Review Stroke 1: The downward moving piston draws a mixture of air and gas vapor into the cylinder. Stroke 2: The piston moves up, compressing the gas mixture. Stroke 3: Just before the piston reaches the top of the cylinder a spark from the spark plug explodes the gas mixture. This pushes the piston down and drives the crankshaft around. Stroke 4: The piston moves up and pushes the gases out through the exhaust valve. As the piston moves down, it pulls more fuel/air mixture in to begin the cycle again. Notice the up-down/linear motion of the pistons Stroke Number Linear motion Rotational motion of the crankshaft