- P -

Petrol

English term for Gasoline.

Petroleum

The crude oil from which gasoline, lubricant, and other such products are manufactured.

PEVR

Power enrichment vacuum regulator.

PFE

Pressure feedback EGR.

PFI

Port fuel injection.

PFI-MA

Ported fuel injection-mass airflow.

PG

See Propylene Glycol.

PGM-FI

Programmed Fuel Injected This is Honda's fuel injection system used on Accord, Civic, and Prelude modles.

PH Level

A measure of the acidity or alkalinity of a solution on a scale where pH0 is most acid, pH14 is most alkaline, and pH7 is neutral.

Phaeton

A four or five passenger, two- or four-door, open-body style that was most popular in the 1920s and 1930s.

Phase

The time displacement expressed as an angular displacement between two or more ac quantities.

Phase Separation

Happons when the alcohol in the gasoline absorbs water in the tank and sinks to the bottom.

Phase Shift

The time difference between two or more signals measured between reference points on each signal and usually expressed in angular displacement degrees.

Phenolic Plastic

Plastic made primarily from phenol, a compound derived from benzene or carbolic acid.

Phosgene Gas

A highly toxic gas, carbonyl chloride (CCOCI2). Until recently, it was believed that phosgene gas was produced when CFC refrigerants, such as R-12, came into contact with heated metal or an open flame. It is now known that little or none of this gas is produced in this manner.

Phosphor Bronze

A hard, tough alloy of copper (Cu), lead (Pb), tin (Sn), and phosphorus (P) low in friction and resistant to wear.

Phosphoric Acid

A colorless and odorless acid (H3PO4) used to remove rust from steel and cast iron.

Photochemical Smog

A noxious, unhealthy gaseous compound in the atmosphere, formed by the interaction of various chemicals such as the pollutants hydrocarbons (HC) and oxides of nitrogen (NOx) in the presence of sunlight.

Photodiode

A semiconductor diode operated as a photo conductor. Normal operation is with its junction reverse biased.

Photoelectric Principle

The production of electricity created by light striking certain sensitive materials, such as selenium or cesium.