DARKW0LV3RIN3's Forum Comments
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Fuel Consumption on High Altitude
Well, the biggest thing to take into consideration is that there is less oxygen in the air at higher altitudes.
Now, fuel is burnt in the presense of oxygen. The more oxygen, the easier the fuel burns.
So, if you have less oxygen you also have less fuel burning. Hence the better fuel economy and decrease in performance.
Now what would happen with a carb motor:
The same amount of fuel would be supplied but less oxygen. This is why it would "rich out". The fuel would not be able to burn as the Oxygen/Fuel ratio would be too low.
With modern fuel injection engines:
The Oxygen/Fuel ratio is kept at an optimum by changing the amount of fuel injected. Hence it will still burn properly but to get to the proper ratio less fuel is injected. Now with this, less fuel is burnt. This then causes the decrease in performance and better fuel economy.
posted by DARKW0LV3RIN3 September 13, 2011 at 12:49 PM
