Does all of the oxygen get used in the cylinder though?
Say you have an air intake limit, would there be any benefit in running some of the exhaust gasses back through the combustion process at a cooled temperature so they essentially burn up all of the available oxygen, using the air that has already been taken in.
I apologise if this seems like a ridiculously stupid concept if it is, engines are by no means my strong or favourite point of motorsport (a lot more interested in composite and bodywork technology), and my knowledge is very limited by engineering standards.
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