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Acetone

1. A highly flammable liquid sometimes used as a racing-fuel additive. Acetone C3COCH3 helps to prevent other chemicals in a fuel mixture from separating. 2. A powerful ketone-type lacquer solvent. 3. Used as a solvent to clean parts.

Acetylene

A highly flammable gas used for metal cutting, welding, and brazing.

Acid

An acronym for a four-mode, driving-test cycle used to test exhaust emissions or vehicle driveability; the modes are Accelerate, Cruise, Idle, and Decelerate.

Acid Dip

1. A method of paint stripping. Metal parts can be immersed in an acid dip to remove all traces of old paint and chemical impurities. 2. To immerse stock-car-body panels in acid to reduce sheet metal thickness by etching, thus reducing weight.

Acid Hydrogen

Compounds that yield hydrogen ions when dissolived in water.

Acid Rain

Corrosive rain formed when sulfur (S) emissions from motor vehicles and industrial plants combine with hydrogen (H) and oxygen (O) in the atmosphere to form sulfuric acid. The mixture of these chemicals with water produces an acid solution that is found in rain. Not only is it corrosive to anything it may come into contact with, it also raises the acidity of lakes and ponds, often to the point that fish and other aquatic life cannot survive.

Acidity

The presence of acid-type chemicals that are identified by the acid number. Acidity within some environments, such as the crankcase of an engine, causes corrosion, sludge and varnish to increase.

Ackerman Principle

The geometric principle used to provide toe-out on turns. The ends of the steering arms are angled so that the inside wheel turns more than the outside wheel when a vehicle is making a turn, without scrubbing the tire treads on the road surface.

Ackerman Steering

A term often used for Ackerman principle.

ACL

1. An acronym for automatic chassis lubrication. 2. Acronym for Automatic Level Control (GM)

ACM

[1] An acronym for air-control module. [2] Asbestos Containing Material

ACOV

Air cut off valve.

Acquisition Mode

Modes that control how waveform points are produced from sample points. Sample, peak detect, hi res, envelop, and average

Acquistion Mode

Modes that control how waveform points are produced from sample points. Some type include sample, peak detect, hi res, envelops, and average.

ACR3

An acronym for an Air Conditioning and Refrigeration Refrigerant Recovery, Reclaim, and Recycle system.

ACRl

An acronym for American City Racing League.

Acronym

A word that is formed by combining some parts (usually the first letter) of some other terms.

ACRS

An acronym for air-cushion restraint system.

ACRV

Air control and reed valve.

Acrylic

A polymer-based coating acrylic widely used for automotive topcoats. Its physical properties can be controlled in part by the choice of the alcohol used to make the ester.