Just to add to all the good info below , just pretend you are in tha ocean. If you are in the first 10' of water there is virtually no pressure on your body. (shallower the water the harder it is to float) at the bottom of the ocean you will be crushed to death by that same water. And Buick&deere is wrong when he says it "isn't velocity" making the difference in power , it is compression ratio AND velocity. More pressure forces in more oxygen faster. Pressure by definition creates velocity. Hense the use of forced induction as a remedy for high altitude (low pressure). Actually raising the compression ratio is the least desirable way to make up for low pressure as you are just squeezing that same unfilled cylinder of air into a smaller area to fire it. You still have to lean up the fuel because there is still less oxygen to mix with it. Opening up the supply passages and or forced induction is the only way to get MORE air for more fuel for more power. Raising compression is a "bandaid" that will give a little more "snap" to it but in the absense of sufficient air pressure to completely fill the cylinder with oxygen to be able to efficiently burn a good amount of fuel you will not make much more power with just the bandaid. When the NHRA pro stock cars run their event at Denver each year they look sick. Their rules only allow carbs and of a set size. The supercharged cars don't suffer much and only because there is less down force on their rear wing so a little less traction to hold all their power.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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