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Today

About the Engine. Construction. Today. Principles of Operation. Engine Construction and Principles of Operation. What is a Gasoline Engine DESIGNED to do?. To Transform Chemical Energy, from Burning Fuel, into Mechanical Energy. For Engine Use, Gasoline Should….

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Today

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  1. About the Engine Construction Today Principles of Operation

  2. Engine Construction and Principles of Operation

  3. What is a Gasoline Engine DESIGNED to do? To Transform Chemical Energy, from Burning Fuel, into Mechanical Energy

  4. For Engine Use,Gasoline Should… Ignite readily, burn cleanly and resist detonation (violent explosion) Vaporize easily Be Free of Dirt, Water, and Abrasives

  5. How Can We Ignite Gasoline So It Can Produce“Explosive” Energy? Introduce Atomization

  6. When Atomized Fuel is Exposed to Surrounding Air & Ignited, Heat Energy is Released with EXPLOSIVEFORCE

  7. What Does This MeanFor Small Engines?

  8. How Does This EXPLOSION Convert to MechanicalEnergy?

  9. Before We Can Answer THIS Question,We Need Answers to the Following? What Will “TIME” the Explosion with position of the crankshaft? How will the Explosion be EXHAUSTED? What Keeps The Crankshaft Turning After the “BURN”? How Will the Mixture be IGNITED? How Will the Engine be Cooled & Lubricated How Will the Air-Fuel Mixture be Introduced? What Hold Parts in Alignment?

  10. Assignment

  11. Before We Answer Questions, Lets See HOW the Small Engine WORKS

  12. Lets Start withSome Major EngineParts

  13. Small Engine Crankshaft Throw Counterweight Connecting Rod Journal

  14. Piston Head Piston Head Connecting Rod Rings Bearing Cap

  15. Piston Head

  16. Intake & Exhaust Valves

  17. Cams

  18. Question 1:What Holds all the Parts in Alignment?

  19. Cylinder Block

  20. Crankcase

  21. TheCylinder Block and the Crankcase are Strong & Ridged to Withstand the Rotational Forces of the Piston & Crankshaft

  22. Question 2:How Will the Air-Fuel Mixture Enter the Cylinder?

  23. Intake Valve

  24. Question 3:How Will The Charge BeIgnited?

  25. The Compressed Air-Fuel Mixture is Ignited by a Spark from the Spark Plug

  26. Question 4:What will TIME the Ignition that forces the Piston downward?

  27. The “Strokes” are timed so that an ELECTRIC CHARGE is initiated at the EXACT time that the AFM is at its MAXIMUMCOMPRESSION

  28. Question 5:How Will the burned charge be EXHAUSTED from the Cylinder?

  29. As the Piston move back up AFTER the firing, it FORCES burnt gases out the Exhaust Port past the OPEN Exhaust Valve

  30. Question 6:How Will the Engine be Cooled and Lubricated?

  31. Air Cooling Fins Crankcase

  32. Air Cooling Fins allow outside air to dissipate the engine heat

  33. The Crankcase, in some engines, also contains the Oil Lubricant that splashes up into the working parts to cool and lubricate

  34. Question 7:What keeps the crankshaft rotating after the firing and until the next firing?

  35. The Flywheel is a WEIGHTED Wheel attached to the Crankshaft that creates centrifugal force

  36. Allowing the crankshaft to continue rotating between firings

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