- A -

AP-EADV

Air pump-electric air control divert valve.

AP-EAP

Air pump-electric air pump.

AP-RV

Air pump-relief valve.

AP-SV

Air pump-solenoid valve.

AP-TV

Air pump-transmitting valve.

AP-VCV

Air pump-vacuum control valve.

AP-VSV

Air pump-vacuum switching valve.

APAA

An acronym for the Automotive Parts an Accessories Association, Inc.

Apex

The innermost point of a turn or corner on a roadway or race course.

Apex Seal

A seal used to retain the combustion pressure at all three tips of the rotor in a rotary engine.

Apexes

The peaks on the rotor, formed by the meeting of two adjoining rotor faces in a rotary engine.

API

An acronym for American Petroleum Institute.

API Degrees

Another term used for API gravity.

API Gravity

The scale for the density (gravity) of a liquid petroleum product, expressed in API degrees. The lighter the product the higher the number.

API Ring

The information printed, in a ring, on the top or side of an oil or lubricant container providing the API specifications and ratings of the contents.

APM

Acronym for Adjustable Pedal Module (Chrysler).

Appearance Money

The payment of money to a popular driver to encourage competition in a race, so his or her participation can be advertised in advance, thereby trying to attract a larger paying crowd.

Application Cable

The line or cable that engages the vehicle's emergency brake system.

Applied Voltage

The voltage applied to the circuit by the scorce.

Apply Devices

Hydraulically operated bands, multi-disc clutches, and mechanically operated one-way clutches that drive or hold the members of a planetary gearset.