four stroke cycle

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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 - PowerPoint PPT Presentation

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Page 1: Four Stroke Cycle

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only

Page 2: Four Stroke Cycle

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Basic Engine Parts

Page 3: Four Stroke Cycle

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Camshaft

Used to open and close valves.

Page 4: Four Stroke Cycle

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Valves Used to let gases

into and out of the combustion chamber.

Page 5: Four Stroke Cycle

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Fuel is burned inside the engine’s combustion chamber to produce heat and pressure

Engine components convert that pressure into rotating motion

Engine Operation

Page 6: Four Stroke Cycle

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Engine Operation

Page 7: Four Stroke Cycle

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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 strokedistance the piston slides up or down

from TDC to BDC

Page 8: Four Stroke Cycle

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Piston Travel

(TDC, BDC)

Page 9: Four Stroke Cycle

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Four-Stroke Cycle

Two complete crankshaft rotationsare required to complete thefour-stroke cycle

Almost all automobiles usefour-stroke-cycle engines

Page 10: Four Stroke Cycle

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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

Page 11: Four Stroke Cycle

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2. Compression Stroke

Piston slides upward and compresses (squeezes) the air-fuel mixture, making it more combustible

Both valves are closed

Page 12: Four Stroke Cycle

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3. Power Stroke Both valves are closed Spark plug fires, igniting the air-fuel

mixture. Piston is forced down, rotating the

crankshaft

Page 13: Four Stroke Cycle

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

exhaust port

Page 14: Four Stroke Cycle

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Four-Stroke Cycle

Page 15: Four Stroke Cycle

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The End

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