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Old 05-08-2009, 07:01 PM   #3
Mobius
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Join Date: May 2008
Location: Drumheller, Alberta
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Easily explained: Try breathing through a straw. The amount of air entering the combustion chamber is reduced when you have a restriction blocking the path of the flow.

Less air means there is less to compress, which follows that the overall pressure will be reduced.
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