Needle valve. A round steel rod with a conical or tapered point that
seats against an outlet and prevents fuel oil from entering the engine cylinder
except when it is lifted by a cam or oil pressure.
Nickel. A metal which, when alloyed to steel and cast iron, improves
their mechanical properties.
Nitrogen. A rather inert gas that makes up slightly more than three-fourths
of the atmospheric air by volume.
Nozzle. The part of the injector or spray valve in which are located
the holes through which the fuel is injected into the cylinder.
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