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 design of the admission port has four major aspects: the geometry of the orifice in the cylinder wall, the geometry of the bore or chamber in the cylinder material, the number of orifices in the cylinder wall, and the position of the orifice in relation to the bottom dead center; to simplify production, it can make sense to move the orifice partly below the bottom dead center.