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Old Aug 14, 2012, 11:21 PM
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United States, LA, New Orleans
Joined Sep 2011
651 Posts
Basically because the air going into the engine doesn't flow smoothly but instead pulses. The air and fuel is sucked in when the port is open and has a certain amount of inertia, and pulls the air along that's behind it. Then the port closes and that air "bounces" against the closed port, as well as there is a certain amount of air puffed out by the closing of the port. This is also mixed with a small amount of fuel because of the inertia of the fuel flowing into the engine. Since the path to the engine is closed the only direction that this charge can move is out, it does.
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