Exhaust Stroke
What is exhaust stroke?
The exhaust stroke is the fourth stroke of the four-stroke engine cycle, in which the piston moves upward from bottom dead center to push burned combustion gases out through the open exhaust valve. The speed of the escaping gases creates a low pressure in the cylinder, which helps draw in the next fresh fuel/air charge. Think of it as the engine "breathing out" before its next intake breath.
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