Four- Stroke EngineOnline version Learn about the 4 cycles of the engine by Ale Brown 1 four-stroke engine a It is a type of engine commonly used in cars, aircraft and other machinery. It cycles through four stages, or strokes, called intake, compression, power and exhaust. b It is the stage in the four-stroke cycle in which the piston returns to the top of the cylinder to force the mixture of fuel and air out through the open exhaust valve. c It is the part of a four-stroke engine where the spent mixture of fuel and air is released from the cylinder. d It is the stage in the four-stroke cycle in which heat ignites the compressed mixture of fuel and air, causing tremendous pressure that forces the piston to the bottom of the cylinder. This stage is the primary source of a machine's power. 2 intake stroke a It is the stage in the four-stroke cycle in which a piston moves to the bottom of the cylinder and makes room for fuel and air to enter the cylinder. Fuel and air are forced in through the intake valve. b It is the part of a four-stroke engine where fuel and air enter the cylinder before being compressed. c It is the stage in the four-stroke cycle in which a piston moves to the top of the cylinder to compress the mixture of fuel and air. d It is a ring that seals the cylinder head to maintain the proper pressure inside the cylinder and prevent substances from leaking in or out. 3 The four-stroke engine works by heating fuel and air in a _______ a compression b exhaust c ignites d cylinder 4 During the first stroke, the __________ valve lets fuel and air into the cylinder. a intake b cylinder c compression d exhaust 5 ignite a make something burn or catch fire b the process of compressing fuel and air c a force caused by pushing against something d an opening where spent fuel is released 6 pressure a the process of releasing spent fuel b to make something burn or catch fire c an opening where spent fuel is released d a force caused by pushing against something 7 Exhaust valve a the process of compressing fuel and air b a force caused by pushing against something c an opening where spent fuel is released d to make something burn or catch fire 8 exhaust stroke a the process of compressing fuel and air b a force caused by pushing against something c an opening where spent fuel is released d the process of releasing spent fuel 9 compression stroke a the process of compressing fuel and air b a force caused by pushing against something c an opening where spent fuel is released d to make something burn or catch fire 10 The engine failed because too much air entered the cylinder during the ___________ a intake valve b intake stroke
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