How does an engine “suck” in air? Like during the intake stroke it goes down which creates a low pressure area and the air rushes in. But how does all that work? How does the piston going down allow air to be pulled in? LOL please explain it as simple TY!
In: Engineering
In a 4-stroke IC engine, remember: “suck” (intake), “squeeze” (compression), “bang” (ignition), “blow” (exhaust).
”Suck”: Intake valves open and piston moves down, creating negative pressure in the cylinder, so air rushes in to fill the vacuum (fuel is either injected or mixed with intake air in a carburetor during this stroke).
”Squeeze”: Intake valves close/piston moves up and compresses the air/fuel mix.
“Bang”: When the piston reaches the end of its travel at the top (top dead center) and maximal compression is achieved, the spark is triggered, the air/fuel ignites, and the rapid increase in pressure due to expanding gases forces the piston down, producing the engine’s power output.
“Blow”: When the piston reaches the bottom of its travel, the exhaust valves open and the piston travels upwards, ejecting the exhaust gases from the cylinder.
(Then, the exhaust valves close, the intake valves open, and the cycle repeats at ”suck”.)
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