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Understanding Four-Stroke Engine Basics

Explore the fundamentals of two and four-stroke engines, components, engine cycles, and application in the real world. Test your knowledge with a quiz at the end.

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Understanding Four-Stroke Engine Basics

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  1. Four-Stroke Engine Basics Next

  2. Orientation • Throughout this lesson on two and four-stroke engines, you will self-navigate through this PowerPoint presentation • Be sure to click on every link • You will be quizzed at the end of the lesson • Click on Next to move on, or Back to go back. Back Next

  3. Orientation Continued • Material that will be covered: • Four-stroke engine basics • Two-stroke engine basics • Other engine types • The four-stroke cycle • The two-stroke cycle • Compare the two types Back Next

  4. Back Next

  5. The Basics • A four-stroke engine: • Is an internal combustion engine • Converts gasoline into motion • Is the most common car engine type • Is relatively efficient • Is relatively inexpensive Back Next

  6. Other Engine Types • Two-stroke engines • Diesel engines • Rotary engines • Turbine engines • Steam engines Back Next

  7. Basic Components of Four-Stroke Engines Camshaft Intake Valve Exhaust Valve Valve Cover Spark Plug Intake Port Exhaust Port Head Piston Connecting Rod Coolant Rod Bearings Engine Block Next Diagram Crankshaft Oil Pan Back Oil Sump

  8. A. Intake Valve- opens at the proper time to let in air and fuel. Back

  9. B. Valve Cover- Protects the valves and the valve springs. Keeps dirt out and lubricating oil in. Back

  10. C. Intake Port- the passageway in a cylinder head for the fuel and air to pass through. Back

  11. D. Head- a platform containing most of the parts of the combustion chamber. Back

  12. E. Coolant- circulating water and antifreeze to keep the temperature regulated. Back

  13. F. Engine Block- cast in one piece. The basis for most of the parts of the engine. Back

  14. G. Oil Pan- where the oil is collected and recirculated. Back

  15. H. Oil Sump- the collected oil primarily for lubricating the crankshaft and rod bearing Back

  16. I. Camshaft- a round shaft with lobes, that rotates to open and close the fuel and exhaust valves. Back

  17. J. Exhaust Valve- open at the proper time to release the exhaust Back

  18. K. Spark Plug- a device, inserted into the combustion chamber for firing an electrical spark to ignite air-fuel mixture Back

  19. L. Exhaust Port- the passageway in a cylinder head, for the exhaust to pass through Back

  20. M. Piston- the part of the engine that moves up and down in the cylinder converting the gasoline into motion Back

  21. N. Connecting Rod- links the piston to the crankshaft. Back

  22. O. Rod Bearing- used to reduce friction to the rod and crankshaft Back

  23. P. Crankshaft- converts the up and down motion of the piston into a turning, or rotating motion Back

  24. The 4-Stroke Cycle • 1. • 2. • 3. • 4. Intake Compression Combustion Exhaust Back Next

  25. Intake- process of filling the cylinder with the proper air-fuel mixture through the intake valve. Back

  26. Compression- the process of compressing the air-fuel mixture in the cylinder to make it more combustible Back

  27. Combustion-the process of igniting the compressed air-fuel mixture to create motion and the over all power of the engine. Back

  28. Exhaust- the process of releasing the exhaust out of the cylinder through the exhaust valve. Back

  29. Application • Now that you understand the basics of four-stroke engines, how can you use this information in the real world? Back Quiz

  30. Lets take a quiz to see what you have learned! Back Quiz

  31. 1. The ____ controls the amount of intake and the release of exhaust. a. head b. valves c. coolant d. connecting rod

  32. The _____ Cycle is the ignition of the compressed fuel-air mixture. a. Exhaust b. Combustion c. Compression d. Intake

  33. The most common type of engine? a. diesel engines b. 2-stroke engines c. rotary engines d. 4-stroke engines

  34. What part of the engine converts up and down motion into a rotation motion? a. crankshaft b. piston c. valve cover d. camshaft

  35. What is the name of the part listed? a. intake valve b. piston c. oil pan d. spark plug

  36. Sorry, that is the wrong answer. Try again. Back

  37. Sorry, that is the wrong answer. Try again. Back

  38. Sorry, that is the wrong answer. Try again. Back

  39. Sorry, that is the wrong answer. Try again. Back

  40. Sorry, that is the wrong answer. Try again. Back

  41. That is correct! Lets try the next one. Next

  42. That is correct! Lets try the next one. Next

  43. That is correct! Lets try the next one. Next

  44. That is correct! Lets try the next one. Next

  45. That is correct! Lets try the next one. Next

  46. Congratulations! That is the end of your quiz, and the end of your lesson on four-stroke engines. • Now it is time to Review Next

  47. References • www.howstuffworks.com/ • www.mda.org.uk/railway/railobjv.htm To Beginning Last Slide

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