Quote:
Originally Posted by tc
Correct.
Maybe a better way to explain it is, that the boost (pressure over ambient) is the same, but the absolute intake manifold pressure is lower because the ambient pressure is lower at altitude.
The % O2 is the same at altitude, just the pressure/quantity of air is less.
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TC, the %O2 in the air at altitude is actually less than that at sea level because O2 is a heavier molecule than some of the other constituents of air and actually "settles" into lower lying areas. This coupled with the fact that there is less air overall is one reason why climbers need to carry 02 tanks at extreme altitudes, and why many high altitude mountain lakes have lower levels of O2 in them than their counterparts at sea level.
Chris