When liquid fuels are injected into the combustion chamber of an internal combustion engine then they evaporate a little bit, especially in the hot air... However liquids that are evaporating extract much heat of the air... This could be good because in the colder air there could be more oxygen dissolved - but the air intake valves are already closed in this phase of the 4- or 2-stroke mechanism... That means the fuel has to burn in nitrogen as well...
Now if there was a secondary air supply system in combustion engines, too (with pressurised air or with clean oxygen) which injected air or oxygen into the cylinder after the fuel injection you could reach the following:
a) cleaner burning (fuels could burn in oxygen and they didn't form molecules with nitrogen),
b) better fuel efficiency (I guess the best burning takes place in oxygen)...
Best wishes, Joseph de la Mikula and Team
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