top dead centre meaning

noun
  (of a reciprocating engine or pump) the piston position at the beginning of the outstroke, ie when the crank pin is nearest to the cylinder (also inner dead centre)

• dead centre:    Noun: dead centreU ...
• bottom dead centre:     see outer dead ce ...
• inner dead centre:     noun  T ...

Examples

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1. At low rpm this occurs close to TDC ( Top Dead Centre ).
2. Instead, it uses a crossplane crankshaft that prevents the pistons from simultaneously reaching top dead centre.
3. A protrusion on the inside is hit by the piston as it approaches top dead centre, forcing the valve open.
4. Diesel motor operation on the other hand inhales and compresses air only by the motion of the piston moving to top dead centre.
5. The advantage of the design should have been very early ( 0-5 degrees before top dead centre ) opening inlet valve.