Assertion: engine's piston | /r/AtLocation | top dead center
Facets:
Source sentences:
text: The power stroke -- all valves remained closed, the piston is at top dead center, and the spark plug ignites that hot compressed fuel/air mixture, forcing the piston back down.
text: Put simply, in a non-interference engine, when the piston is at top dead center (TDC), it will never go higher than a fully open valve; that is, the piston can never “interfere” with the valves.