This article is about the use of nitrous oxide in a motorsports context. For other uses, see Nitrous oxide.
"Nitrous" redirects here. For the chemical terminology and other uses, see nitrogen compounds.
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A performance vehicle using a nitrous oxide purging system
A nitrous oxide engine, or nitrous oxide system (NOS) is an internal combustion engine in which oxygen for burning the fuel comes from the decomposition of nitrous oxide, N2O, as well as air. The system increases the engine's power output by allowing fuel to be burned at a higher-than-normal rate, because of the higher partial pressure of oxygen injected with the fuel mixture.[1] Nitrous injection systems may be "dry", where the nitrous oxide is injected separately from fuel, or "wet" in which additional fuel is carried into the engine along with the nitrous. NOS may not be permitted for street or highway use, depending on local regulations. N2O use is permitted in certain classes of auto racing. Reliable operation of an engine with nitrous injection requires careful attention to the strength of engine components and to the accuracy of the mixing systems, otherwise destructive detonations or exceeding engineered component maximums may occur. Nitrous oxide systems were applied as early as World War II for certain aircraft engines.
^"Nitrous: Everything You Need to Know". Automoblog.net. 2011-09-27. Retrieved 2013-07-11.
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