Nitrous oxide used in racing is supposed to allow fuel to burn completely. Does this mean most vehicles are running a too-rich fuel mixture and need their engines redesigning for leaner burn?
by 
exup25th
ANSWERS: 1
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Most modern gas engines run very close to optimum fuel-air ratio. It is not possible to get perfect mixing, so engines typically have some unburned hydrocarbons in the exhaust, which is why cars have post-combustion pollution ruduction devices. Government efficiency and emission standards as well as market competition force the manufacturers to optimize this in production engines. I believe that N2O systems add extra fuel when injecting the N2O and the extra fuel is measured to be the right ratio to recombine with the oxygen in the added N2O.
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