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NO2

Nitrogen Dioxide.

Noble Metals

A rare and expensive group of metals that resist corrosion such as gold (Au), iridium (Ir), platinum (Pt), palladium (Pd), ruthenium (Ru), and rhodium (Rh), some of which may be found in catalytic converters.

Nodular Cast Iron

Cast iron used to make engine blocks that is treated, while molten, with an alloy that causes the formation of the graphite in very small lumps.

Noid Light

Short for solenoid, a noid light is used to test solenoids like fuel injectors.

Noise

An unwanted voltage or current in an electrical circuit.

Nomax

A popular trade name for a fabric that is used in race drivers' apparel.

Nominal Rating

The lowest rating of a system or device.

Nominal Size

A designation used for general identification, such as the inside diameter of a tube.

Non Repetitive Pulse

A ramdom electrical signal, with no specific pattern or frequency.

Non Synchronized

Relating to injector control, these are fuel pulses not related to the RPM reference. ECM control of the fuel injectors in not directly related to ignition reference signals.

Non Volatile Memory

Memory that is retained in the computer not affected by applyed voltage.

Non-destructive Test (NDT)

A method of testing without causing damage.

Non-leaded Gasoline

A term used for unleaded gasoline.

Non-live Axle

A non-driven truck axle that is held off the road when the vehicle is empty and put on the road when a load is being carried, sued extensively in eastern states with high per-axle weight laws.

Non-load Bearing Ball Joint

A term used for non-load-carrying ball joint.

Non-load-carrying Ball Joint

A ball joint designed with a preload which provides damping action that maintains suspension component location but does not support the chassis weight. Also known as a stabilizing ball joint.

Non-miscible

Not capable of being mixed in any proportion.

Non-servo

A type of drum brake in which the brake shoes work independently of each other.

Non-slip Differential

A differential that is designed so that when one wheel slips, the major portion of the driving power is transferred to the non-slipping wheel.

Nonconductor

1. A material that does not conduct electricity. 2. A material that is resistant to the conduction of heat.