As you go up, air is less dense and there are two effects on internal combustion engines. One is that the air/fuel mixture will lean out and the other is that the dynamic compression ratio will change.
Compression ratio is the change in volume from when the piston is at the bottom of the stroke to the top of the stroke has a significant effect on engine power. By adding more and more dome to a piston and changing the static compression ratio, a manufacturer could maintain the same power in say, Denver as they could in Houston. If you take that same "high altitude" engine and move it to Houston, it will make more power than the lower compression engine but it will be more picky about fuel and ignition timing.
Aircraft with piston engines work these problems by a pilot operated mixture control and with turbocharching.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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