2. Automotive Industry

3. Career Opportunities The automotive industry is expected to be one of the top growing career fields. Employment is expected to grow by 634,000 employees which places them in the top 10 of growing career fields. The automotive industry offers jobs in many different areas. –Sales, Service, Repair, Parts, and Others

4. The Automotive Industry might be a career interest if: You like cars Enjoy fixing or repairing mechanical devices You enjoy sales You like meeting new people You enjoy technical information and problem solving.

5. The Four Stroke Engine The Heart of the Automobile

6. A car's engine is an example of a four stroke engine. It relies on a mixture of gasoline and air being ignited by a spark plug. This should happen at just the right moment. If the explosion happens too early or too late, the engine will not run correctly. Let's see how a four stroke engine works!

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

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

9. The Third Stroke (also called combustion stroke) 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. Spark Plug Piston is moving down

10. 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 exhaust valve open Piston is moving up

11. 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 Rotational motion of the crankshaft Linear motion

12. Credits Thanks to http://www.schoolscience.co.uk for providing the text and pictures to create this PowerPoint.http://www.schoolscience.co.uk