Because I'm defining "density" as the ratio of oxygen to the other gasses that make up the atmosphere. When you blow "atmosphere into a cylinder , you are forcing volumn in but you are not changing the ratio. It isn't all oxygen and oxygen is the only gas giving power. A piston only has a set amount of travel to get itself filled. At 5000' it needs something to get the pressure at least back to 14.7#. A "volumn" of air needs needs pressure to move it effectively and pressure acting on volumn equals velocity. Basically I think we are referring to two different "densities" , fuel/air mixture and atmospheric oxygen levels.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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