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I got the same question wrong Twisted. But I disagree. as the piston moved downward, it creates a vacuum or "suction" on the opening where the valve is. That is why when an engine is running, it has vacuum in the intake, that is used for brake boost and any other vacuum operated device on the car. Suction DOES exist. But still an interesting test.
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"It is not that I have failed, but that I have found 10,000 ways that it DOESN'T work!" --Thomas Edison
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