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Four Stroke Cycle

Four Stroke Cycle. Engine Fundamentals. Basic Engine Parts. Camshaft. Used to open and close valves. Valves. Used to let gases into and out of the combustion chamber. Engine Operation. Fuel is burned inside the engine’s combustion chamber to produce heat and pressure

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Four Stroke Cycle

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  1. Four Stroke Cycle Engine Fundamentals

  2. Basic Engine Parts

  3. Camshaft • Used to open and close valves.

  4. Valves • Used to let gases into and out of the combustion chamber.

  5. Engine Operation • Fuel is burned inside the engine’s combustion chamber to produce heat and pressure • Engine components convert that pressure into rotating motion

  6. Engine Operation

  7. Piston Travel Terms:(TDC, BDC) • Top dead center (TDC) • piston is at its highest point in the cylinder • Bottom dead center (BDC) • piston is at its lowest point in the cylinder • Piston stroke • distance the piston slides up or down from TDC to BDC

  8. Piston Travel(TDC, BDC)

  9. Four-Stroke Cycle • Two complete crankshaft rotationsare required to complete thefour-stroke cycle • Almost all automobiles usefour-stroke-cycle engines

  10. 1. Intake Stroke • Intake valve is open • Exhaust valve is closed • Piston slides down and forms a vacuum in the cylinder which draws fuel and air into the engine

  11. 2. Compression Stroke • Piston slides upward and compresses (squeezes) the air-fuel mixture, making it more combustible • Both valves are closed

  12. 3. Power Stroke • Both valves are closed • Spark plug fires, igniting the air-fuel mixture. • Piston is forced down, rotating the crankshaft

  13. 4. Exhaust Stroke • Piston moves upward • Intake valve is closed • Exhaust valve is open • Burned gases are pushed out the exhaust port

  14. Four-Stroke Cycle

  15. The End

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