four stroke cycle
Post on 02-Jan-2016
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© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Basic Engine Parts
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Camshaft
Used to open and close valves.
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Valves Used to let gases
into and out of the combustion chamber.
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Fuel is burned inside the engine’s combustion chamber to produce heat and pressure
Engine components convert that pressure into rotating motion
Engine Operation
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Engine Operation
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
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
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Piston Travel
(TDC, BDC)
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Four-Stroke Cycle
Two complete crankshaft rotationsare required to complete thefour-stroke cycle
Almost all automobiles usefour-stroke-cycle engines
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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
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
2. Compression Stroke
Piston slides upward and compresses (squeezes) the air-fuel mixture, making it more combustible
Both valves are closed
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
3. Power Stroke Both valves are closed Spark plug fires, igniting the air-fuel
mixture. Piston is forced down, rotating the
crankshaft
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
4. Exhaust Stroke Piston moves upward Intake valve is closed Exhaust valve is open Burned gases are pushed out the
exhaust port
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
Four-Stroke Cycle
© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only
The End
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