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Old 03-01-2021, 06:18 AM   #14 (permalink)
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High levels of oxygen can cause otherwise inflammable materials to spontaneously ignite.

CO2 chokes (retards) the flame in relatively small amounts , the two together would ???
There would need to be some happy medium

In effect you are building a rocket or welder the two gases are moderately expensive and onboard production would be $$$ and heavy, likely power intensive as welll.

That said because people are considered too incompetent to fill a water bottle on a car engineers are working on recovering water from exhaust to direct inject at various points during combustion to improve fuel economy and emissions.
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