before bottom dead center

(BBDC) As the crankshaft rotates, it brings the piston down to a place just before it reaches bottom dead center.

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • bottom dead center — (BDC) The lowest point of the piston and connecting rod travel in a cylinder. In a horizontally opposed engine, it is sometimes called the outer dead center. Opposite to top dead center. Also see after bottom dead center before bottom dead center …   Dictionary of automotive terms

  • dead center — The point at which the piston reaches its uppermost or lowermost position in the cylinder the rod crankjournal would be at 11 o clock UDC or 6 o clock LDC. Also see after bottom dead center after top dead center before bottom dead center before… …   Dictionary of automotive terms

  • before bottom center — The position of the piston in the cylinder of a reciprocating engine as the piston is moving downward, just before the bottom of its stroke, with the crankshaft turning in the direction of normal rotation. Beaufort scale. Position of the piston… …   Aviation dictionary

  • center — To place something in a central place in relation to other items. Also see after bottom dead center after top dead center before bottom dead center before top dead center before upper dead center bottom dead center dead center diagnostic center …   Dictionary of automotive terms

  • Dead centre — For the lathe tool, see lathe center. In a reciprocating engine, the dead centre is the position of a piston in which it is farthest from, or nearest to, the crankshaft. The former is known as top dead centre (TDC) while the latter is known as… …   Wikipedia

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