DICTIONARY OF AUTOMOTIVE TERMS - "By"

Bye-channel

Waterway dug round the side of a reservoir or dam to carry off surplus water from the streams entering it.

Bypass

1. A road which avoids the congested area of a city traffic.
2. An alternate route for a flowing substance.
3. To go around something to avoid it.
4. A passage at one side of, or around, a regular passage

Also See
Oil cooler bypass valve
Oil filter oil filter bypass valve
Start bypass

Bypass air screw

A screw located on the airflow sensor of a fuel injection system. It adjusts the amount of air allowed into the air-fuel mixture.

Bypass air solenoid

(BPA) A device used to control the idle speed on some fuel-injected vehicles.

By-pass capacitor

A capacitor having a low reactance for frequencies of interest connected in shunt with other components so as to short-circuit them for signal frequency currents.

Bypass filter

An Oil filter that constantly filters a portion of the oil flowing through the engine.

Bypass ratio

The ratio of the by-pass airflow to the combustion airflow in a dual-flow turbojet having a single air intake.

Bypass turbojet

A turbojet in which part of the compressor delivery is by-passed around the combustion zone and turbine to provide a cool, slow propulsive jet when mixed with the residual efflux from the turbine.

Also See
Ducted fan

Bypass valve

1. (BPV) A valve that can open and allow fluid or gas to pass through in other than its normal channel.
2. A switching device ( Silicon-controlled rectifier or, in the past, mercury arc valve), connected across the converter switching devices of a high-voltage DC transmission system, normally not conducting but able to maintain flow of current whenever the main conducting devices have to be interrupted.
3. A valve by which the flow of fluid in a system may be directed past some part of the system through which it normally flows, e.g., an oil-filter in a lubrication system.

Also See
Air bypass valve
Oil cooler bypass valve
Oil filter oil filter bypass valve