before top center
- The position of the piston in the cylinder of a reciprocating engine as the piston is moving upward, just before the top of its stroke, with the crankshaft turning in the direction of normal rotation.Position of the piston at before top (dead) center position. The crank throw and the connecting rod are aligned when the piston reaches top dead center position.
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before top dead center — (BTDC) As the crankshaft rotates, it pushes the piston up to a place just before the top of its movement … 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
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
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