bottom dead center


Also found in: Acronyms.

bottom dead center

[′bäd·əm ‚ded ′sen·tər]
(mechanical engineering)
The position of the crank of a vertical reciprocating engine, compressor, or pump when the piston is at the end of its downstroke. Abbreviated BDC.

bottom dead center (BDC)

bottom dead center (BDC)click for a larger image
The position of the piston within a cylinder of a reciprocating engine when it has reached its position farthest from the cylinder head.
References in periodicals archive ?
Consequently, the piston head approaches the bottom dead center when the port is opened and the admission pressure is achieved.
An excessive admission clearance also causes backflow through the admission port when the piston leaves the bottom dead center.
The functional demonstrator of the DLR operates with a mass variable gas spring, in which an electromagnetic switching valve fills the chamber to the appropriate pressure in the bottom dead center (BDC) of the gas spring.
For example, at top dead center on a crank pin there is very little cheek metal, almost none really, while at bottom dead center, on the same pin, the heated area is virtually surrounded by a huge heat sink.
During the intake of the air-fuel mixture in the Quad-4, a piston moves through a full stroke and past bottom dead center. The intake valve closes only when the piston has passed through a third of the compression stroke.