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Butt Weld

A type of weld that joins two pieces of metal by fusion.

Butterfly

A type of valve used for the choke and throttle valve in a carburetor; a moveable plate that controls the amount of air permitted to enter the carburetor.

Butterfly-style Tonneau Cover

A hard tonneau cover that is hinged in the center and can be opened from either side for easy access.

Butyl

The trade name of a synthetic rubber.

Buzz Box

A small car with a noisy engine.

Buzzer

An electric sound generator that makes a "buzzing" noise when activated. It operates on the same principle as a vibrating bell. Sometimes used to warn the driver of possible safety hazards, such as when the seat belt is not fastened.

BV

Bowl vent

BVA

Brake pad wear indicator

BVS

Battery voltage sensor or bowl vent solenoid

BVSB

Bi-metal Vacuum Switching Valve

BVSV

Bimetallic vacuum switching valve

BVT

Backpressure variable transducer

BVV

Bowl vent valve

BW

Borg warner

Bye

A solo run during drag eliminations.

Bypass

1. A passageway between the head and block or behind the water pump that allows a water pump to circulate coolant throughout the cylinder head and engine block before the thermostat opens. 2. A valve that is used to regulate pressure or control the quantity of a liquid or gas. 3. A shunt or parallel path around one or more elements in a circuit.

Bypass Capacitor

A capacitor that provides a low impedance path (usually to ground) to remove unwanted signals from the main signal path.

Bypass Control Valve

A valve used in a bypass system.

Bypass Line

A line or hose used in a bypass system to transfer liquid or gas.

Bypass Tube

A tube directly in front of the thermostat. The coolant bypasses the radiator through this tube when cold.