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By Ryan Saucier

Engine Cycles. By Ryan Saucier. Introduction to Engine Cycles. For an engine to operate, a series of events must occur in sequence:. Series of Events. Fill the cylinder with a combustible mixture. Compress this mixture into a smaller space. Series of Events.

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By Ryan Saucier

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  1. Engine Cycles By Ryan Saucier

  2. Introduction to Engine Cycles • For an engine to operate, a series of events must occur in sequence:

  3. Series of Events • Fill the cylinder with a combustible mixture. • Compress this mixture into a smaller space.

  4. Series of Events 3. Ignite the mixture and cause it to expand, producing power. 4. Remove the burned gases from the cylinder.

  5. Series of Events • To produce sustained power, the engine must repeat this sequence over and over again. • One complete series of these events in an engine is called a cycle.

  6. Engine Cycles • Most engines have one of the two types of cycles: • Two-Stroke Cycle • Four-Stroke Cycle

  7. Two-Stroke Cycle • In the two-stroke cycle engine, there are two strokes of the piston, one up and one down, during each cycle. • Then the cycle starts over again on another cycle of the same two strokes. • The entire cycle occurs during one revolution of the crankshaft.

  8. Two-Stroke Cycle Engines: Intake and Compression

  9. Two-Stroke Cycle Engines: Power and Exhaust

  10. Two-Stroke Cycle Engine in Action

  11. Examples of Two-Stroke Engines • Weed eaters • Lawnmowers • Chainsaws *Can you name other examples?

  12. Four-Stroke Cycle • In the four-stroke cycle engine, there are four strokes of the piston, two up and two down, during each cycle. • Then it starts over again on another cycle of the same four strokes. • This cycle occurs during two revolutions of the crankshaft. • Most engines today operate on the four-stroke cycle.

  13. Four Stroke Cycles

  14. Intake Stroke • The intake strokes starts with the piston near the top and ends shortly after the bottom of its stroke. • The intake valve is opened, allowing the cylinder to receive the fuel-air mixture as the piston moves down. • The valve is then closed, sealing the cylinder.

  15. Compression Stroke • The compression stroke begins with the piston at the bottom of the cylinder and rises up to compress the fuel-air mixture. • Since the intake and exhaust valves are closed, there is no escape for the fuel-air mixture and it is compressed to a fraction of its original volume.

  16. Power Stroke • The power stroke begins when the piston almost reaches the top of its stroke and the fuel-air mixture is ignited. • As the mixture burns and expands, it forces the piston down on its power stroke. • The valves remain closed so that all the force is exerted on the piston.

  17. Exhaust Stroke • The exhaust stroke begins when the piston nears the end of its power stroke. • The exhaust valve is opened and the piston rises, pushing out the burned gases. • When the piston reaches the top, the exhaust valve is closed and the piston is ready for a new four-stroke cycle.

  18. Examples of Four-Stroke Cycle Engines • Cars • Trucks • Tractors Can you name other examples?

  19. Multiple Cylinder Engines • Used for a more continuous flow of power. • Modern engines use four, six, eight or more cylinders. • The same four-stroke cycle occurs in each cylinder.

  20. Examples of Various Multi-Cylinder Engines Opposing Four Cylinder Engine or Boxer Engine Inline Four Cylinder Engine V- 6 Engine

  21. Rotary Engine

  22. Rotary Engine

  23. Examples of Uses of Rotary Engines Datsun 280Z Mazda RX-8 Any Others?

  24. Any Questions

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