after top dead center

(ATDC) A term used in timing the relation of the spark and the crankshaft. The position of the piston as it starts its way down.

Dictionary of automotive terms. 2015.

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  • after top center/after top dead center — The position of a piston in the cylinder of a reciprocating engine after the crankshaft, turning in its normal direction of rotation, has caused a piston to pass the top of its stroke and start back down. The crankshaft, crankpin, and cylinder… …   Aviation dictionary

  • top dead center — (TDC) Highest point of piston and connecting rod travel in a cylinder; the ends of the compressionexhaust strokes in a four cycle engine. See after top dead center before top 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

  • 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

  • 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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