BTDC

Acronym for Before top dead center. Spark occurs on the Compression stroke, before the Piston reaches Top dead center.

B thread

See

• Internal thread
• Class B thread

B-Train

Colloquial term for a truck tractor pulling two semi trailers where the second trailer sits on a fifth wheel that is permanently attached and extends off the rear of the lead trailer. Most commonly used on flatbeds or tank trailers. The B-train is considered a more stable double trailers configuration.

BTS

1. Acronym for Battery Temperature Sensor
2. Acronym for Bureau of Transportation Statistics. An organization which compiles, analyzes, and publishes statistics relevant to the US nation's transportation system. Created to improve the knowledge base for public decision-making and to improve public awareness of the nation's transportation system, BTS collects information on transportation and other areas as needed. The Bureau's largest data collection programs are the Commodity Flow Survey and the American Travel Survey, conducted jointly with the Bureau of the Census to identify where freight and people go by all modes of transportation.

BTSI

Acronym for Brake Transmission Shift Interlock

BTU

1. Acronym for British thermal unit. The amount of heat that must be added to one pound of water to raise its temperature one Fahrenheit degree.
2. Acronym for Board of Trade unit equal to 1 kWhr.

BTU Gas

See

• Low BTU Gas

BTX

1. Industry term referring to the group of aromatic hydrocarbons benzene, toluene and xylene
2. Acronym for benzene, toluene, xylene

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