As another has posted you have mixed up a few things: Your example of the ocean and the pressure increasing as we go to deeper water is correct. In a simliar manner we are all in an ocean of air and the air pressure increases as we go deeper in that ocean of air. However, air is a little different than water in that it's density increases significantly as the pressure is increased. At sea level we are in the deepest part of the air ocean and the pressure and density of air is at its maximum. Conversely at the top of Pikes Peak we are in "shallow air" and the pressure and therefore density is much less than at sea level. This air pressure is applied equally at the inlet side and the exhaust side of an engine so the change in power output results from the change in air density. An exception would be for forced induction engines; the inlet air is pressurized which increases the density and in the event delta pressure is increased across the inlet system the air velocity can also increase. In this case the change in power results from the air density increase and to a smaller degree the velocity increase.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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