Terms Starting with N


National Lubricating Grease Institute (NLGI)-One of several organizations that rate the consistency of greases.

Naturally aspirated-An engine that uses the atmospheric pressure to force the air into the cylinders.

NC-An indicator of the number of threads per inch on a bolt referred to as National Course.

Needle valve-A small valve used in the center of a fuel injector nozzle.  The valve is shaped like a thick needle and controls the opening and closing of ports for fuel injection.  Needle valves are also used on carburetors to control the amount of fuel going through a carburetor jet.

NF-An indicator of the number of threads per inch on a bolt referred to as National Fine.  National Fine will have  more threads per inch on a bolt than a National Course bolt.

Nitrogen Oxide-A type of engine pollutant produced when the internal combustion temperatures of an engine reach 2,200-2,500 degrees Fahrenheit.

Nitrogen in Tires-Tires that are inflated with nitrogen maintain tires pressures better, reduce leakage, and last longer, especially in extreme applications.  Many trucks, military vehicles and high performance applications use nitrogen instead of air to inflate the tires.  Also, nitrogen is becoming more popular in passenger vehicles. 
Go to www.getnitrogen.org for more information.

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