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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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