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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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