bottom dead center meaning

[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."

• dead center:    Noun: dead center& ...
• on dead center:    [American idiom]ex ...
• bottom dead centre:     see outer dead ce ...

Examples

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1. bbdc before bottom dead center
2. abdc after bottom dead center
3. abdc after bottom dead center
4. bbdc before bottom dead center
5. abdc after bottom dead center