5. Supreme Power

6. Engine Basics The four cycle engine

7. Engine Operation The Otto Cycle engine

8. Properties of Combustion Air Fuel Spark/heat source

9. Intake Stroke -Air and fuel are mixed by carb or via injector and throttle body -As the piston descends vacuum is created drawing in fuel and air

10. Air/Fuel Mixture

11. Intake Stroke -Atomized fuel enters the combustion chamber via the intake valve the exhaust valve remains closed

12. Compression Stroke As the piston returns to top of cylinder or Top Dead Center the atomized fuel/air mixture is compressed Both the intake and exhaust valves are held shut to increase pressure

13. Power Stroke As the piston returns to the top an electronically fired spark ignites the air/fuel mixture The resulting explosion creates pressure and forces the piston down to Bottom Dead Center

14. Exhaust Stroke As the piston returns to Top Dead Center the exhaust valve opens allowing the burnt fuel to vent into the exhaust system

15. Engine Timing The entire cycle take two revolutions of the Crankshaft Timing is controlled by chain, belt or gears

16. Four Cycles in Motion Intake Compression Power Exhaust

17. Four Cycles in Motion Intake Compression Power Exhaust

18. Linear Motion into Rotational Force

19. Other Engine Types

20. Other Engine Types Continued

22. Internet Sources From: http://science.howstuffworks.com/engine.htm http://science.howstuffworks.com/engine.htm

23. Internet Sources From http://www.autoshop- online.com/auto101/eng1.html http://www.autoshop- online.com/auto101/eng1.html

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