top dead center


Also found in: Acronyms.

top dead center

[¦täp ′ded ′sen·tər]
(mechanical engineering)
The dead-center position of an engine piston and its crankshaft arm when at the top or outer end of its stroke.

top dead center (TDC)

top dead center (TDC)click for a larger image
top dead center (TDC)click for a larger image
Topographical map
The position of the piston within the cylinder when the piston has reached its farthest uppermost (closest to the cylinder head and valves) position.
References in periodicals archive ?
In order to study the effect of bridging at the piston 3rd land on ring-liner lubrication, an additional 10[micro]m oil film was put at the pin side of the liner around the top dead center and the bottom dead center in the intake and expansion strokes (the two red stripes in Figure 15).
Caption: FIGURE 9: Temperature distribution of the engine's cylinder at top dead center positions in the environment of different high [O.sub.2] volume fraction.
When the latch releases, the tightly wound spring gives the armature a quick twist, which produces a very hot spark at top dead center. After the impulse is released, the spark will fire 35 degrees before top dead center.
In the diagram, [V.sub.1] represents the total volume in the compressor cylinder when the piston is at top dead center (TDC).
More than likely just a little off top dead center for San Francisco's rent-a-tranny free enterprise zone.
After establishing a top dead center and a bottom dead center, Chudleigh ran a wire from pole to pole.
Look for the "Sail Bus" (you'll know when you see it), the Eugene City Council, the "Humoroids" and "Top Dead Center," a motor scooter club.
O-rings (of varying outer and core diameters) were placed on a specially designed table so that they could be accurately displaced laterally to determine the effect of testing away from the top dead center.
The linkage provides plenty of leverage and includes a positive mechanical stop when the ram reaches top dead center. This really simplifies adjusting the sizing die for full-length sizing.
Two signals are provided: a top dead center indicating the zero degree position of the crankshaft and a pulse per degree signal.