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Originally Posted by dmodified1
Perfect combustion will result in water and carbon dioxide out of the exhaust pipe which would be 0% oxygen
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It'd mean water and CO2 out the pipe, but it'd still need excess air during and up to the latest stages of combustion.
Once your Oxygen level drops too low, combustion slows down and becomes incomplete / inefficient. Too little oxygen, and it could stop altogether.
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so efficient combustion would be a lower percentage.
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Honda lean burn ?
More air. Less fuel.
And a nasty tendency to burn the 78% N2 in the air ...
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you cant have more power and less heat
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That's true.
For a given amount of fuel.
If you burn more of the energy there is in it, it'll develop more heat.
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Extra oxygen in the exhaust means there was not enough fuel to burn all of the oxygen, an engine is an air pump that adds fuel.
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You don't burn the oxygen, it burns the fuel.
You always need excess oxygen for proper combustion.
21% oxygen goes in.
The less fuel you (need to) add, the less oxygen you trap in CO2, and the more oxygen will remain in the exhaust mix.
That's when you downsize the cylinder size, reduce the amount of oxygen / air being pumped through, and match it again with the fuel being used.
Or cut out a few cylinders (COD) and put more fuel through each remaining cylinder.
(Still, Iwouldn't inhale 16% O2 mixtures though, they'll kill you.
Air re-mixing happens pretty fast, fortunately, as the driving force is quite big.)