- B -

B

Boron An element with the atomic number of 5

B+

Battery positive

B-

Battery negative

B-Cam

A pattern used to grind pistons in an oval or cam shape with a 0.006 inch (0.152 mm) difference between the face and pinhole side.

B-Dolly Train

A combination of two or more trailers in which the dolly is connected by two or more pintle hooks, couplers, and drawbar connections located between each vehicle, making a rigid connection, The resulting connection has one pivot point.

B-Pillar

The structural support just behind the front door.

B-Pillar

A pillar that supports the roof of a vehicle and is located between the front and rear side windows. Some vehicles, typically hardtops and some coupes, do not have B-pillars.

B-Post

A term often used for B-Pillar.

B-Shim

A valve spring adjuster with a 0.030 inch (0.76mm) used to balance spring pressure and to correct installed height.

B-Train

A combination of two or more trailers in which the rear trailer is connected at a single pivot point, commonly a fifth wheel, which is mounted on an extension of he frame of the lead trailer.

B/F

Backfire

B/MAP

A Manifold Absolute Pressure Sensor that includes Barometric Pressure measurement

B/P

Back pressure

Ba

Barium An element with the atomic number of 56

Babbitt

An alloy used to line bearings made up of tin, antimony, copper, and other metals.

Baby Moons

Small chrome-plated wheel covers.

BAC

Bypass air control

Back Diode

A tunnel diode that is selected for its reverse-conduction characteristics.

Back Flush

The use of a reverse flow of water, with or without a cleaning agent, to clean out the cooling system of a vehicle.

Back Motor

A mid- or rear-mounted engine.