DICTIONARY OF AUTOMOTIVE TERMS - "Pn"

P/n

Abbreviation for part number

PN

Acronym for part number

Pneumatic device

A device moved or worked by air pressure.

Pneumatic suspension

See
air suspension.

Pneumatic tire

A flexible, hollow rubber forming the outer part of the vehicle wheel and inflated by air pressure. Originally rubber tires were solid core. Dunlop was the first to invent a tire with an air-filled tube for bicycles. Later, tubeless tires were invented. The tire is filled with enough compressed air to support the weight of the vehicle and cushion road impacts. The opposite is solid tire

Pneumatic trail

The distance between a vertical line through the center of the wheel and the center of pressure of the tire contact patch; most apparent during cornering. See self-aligning torque.

Pneumatics

The study of pressure and flow in gases. A pneumatic drill is operated by compressed air; a pneumatic tire contains compressed air.

PNGV

Acronym for Partnership for a New Generation of Vehicles.

PNP

1. Three element transistor made of two layers of semi-conductor materials
2. Acronym for Park/Neutral Position switch which determines if the gear selector is in Park or Neutral