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 ?
Close to the bottom dead center, it finally opens the port to start the admission phase.
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.
During the intake of the air-fuel mixture in the Quad-4, a piston moves through a full stroke and past bottom dead center.
Here the exhaust valve remains closed until the piston travels to bottom dead center.