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The immediate issue I see with the practicality of this (and I know I'm late to the thread) is the volume of oxygen.
Peak, a 2.4L engine like as is in my car, pumps 2.4L of air through per revolution. Assuming we want to feed it pure oxygen at 20% of the volume of the air that would normally pass through it (0.48L per revolution), the oxygen generator would need to be able to produce over 200,000L per oxygen per hour.
A quick google search suggests that the typical home oxygen concentrator can produce 3L per minute and uses around 120w. This suggests that, to feed my engine pure oxygen, there would be an electrical cost of 150,000w, or approximately 200HP - the approximate full mechanical output of my engine when using that oxygen, without conversion losses accounted for.
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