Posted by MarkB_MI on December 23, 2018 at 04:02:04 from (174.230.14.250):
In Reply to: Compression question posted by SVcummins on December 22, 2018 at 16:32:56:
Compression ratio is unaffected by altitude, because it's fixed by the mechanics of the engine. Power, on the other hand, not.
The greater the density of the air-fuel mixture, the greater the power output of a given engine. The density of air is affected by altitude, temperature and humidity. Pilots are well aware of this effect and routinely calculate "density altitude" to predict aircraft performance.
As density altitude increases (meaning air density decreases), the engine becomes less prone to detonation. So the engine may be operated with lower octane fuel or with greater spark advance. If you travel from Kansas or Nebraska into Colorado, you'll notice the octane rating posted on gas pumps drops when you cross the Colorado state line. That's because states at high elevations are allowed to sell lower octane gasoline than is sold in neighboring states. And back in the day, before computerized engine control, we would run our engines with a few degrees extra advance beyond factory spec when we were at high altitude.
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