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NIASE

National Institute of Automotive Service Excellence.

Nichrome

A metallic compound containing nickel and chromium, used in making high resistance filaments.

Nickel

An element, Ni, used in alloys and electroplating.

Nikasil

A trade name of a popular coating applied to the walls of cylinder sleeves to reduce friction and promote sealing at high temperatures.

Nitride

A compound containing electronegative nitrogen and an elecropositive element or metal.

Nitrile

A type of rubber like material that is okay for use with petroleum products.

Nitrile Seal

Seal made by mixing butadiene and acrylonitrile.

Nitro

A short term used for nitromethane.

Nitrogen

A colorless, odorless, tasteless gas that makes up 78% of the atmosphere and is part of all living tissues.

Nitrogen Oxide

Any chemical compound of nitrogen and oxygen (NOx) as a by-product of combustion that forms smog in the presence of sunlight.

Nitromethane

A highly combustible liquid that is the main ingredient in drag-racing fuels.

Nitrous Oxide

A non-flammable, non-explosive gas (N2O) used as an oxidizing agent with gasoline or methanol to increase the rate and efficiency of combustion thereby increasing the horsepower.

Nitrous Oxide Systems (NOS)

A popular manufacturer of nitrous oxide injection systems.

NLGI

An abbreviation for the National Lubricating Grease Institute, Usually associated with grease, The higher the NLGI number, the firmer the grease; #000 is very fluid whereas # 5 is very firm. The consistency most recommended is NLGI #2 (soft).

NLV

Non linear valve.

Nm

Newton meter.

NO

Nitric oxide; Also No, Nobelium An element with the atomic number of 102.

No Good (NG)

Not fit for service.

No-load Test

A starting-motor test to determine the rpm and current draw of a starter motor. The mechanical tachometer is placed on the drive end of the armature shaft and the motor is then connected to a proper power source. An ammeter, attached to the power means, determines current required.

No-tilt Convertible Fifth

A fifth wheel with fore/aft articulation that can be locked out to produce a rigid top plate for applications that have either rigid and/or articulating upper couplers.