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Top dead center in a gasoline engine. In a reciprocating engine, the dead centre is the position of a piston in which it is either farthest from, or nearest to, the crankshaft. The former is known as top dead centre (TDC) while the latter is known as bottom dead centre (BDC). [1] Position of pistons
BDC = Bottom dead centre; IO = Inlet valve opens; IC = Inlet valve closes; EO = Exhaust valve opens; EC = Exhaust valve closes; Either valve opens before the piston head reaches top dead centre or bottom dead centre. The amount in crankshaft degrees by which the valves open before top dead centre or bottom dead centre is reached is known as ...
Sparks occurring after top dead center (ATDC) are usually counter-productive (producing wasted spark, back-fire, engine knock, etc.) unless there is need for a supplemental or continuing spark prior to the exhaust stroke. Setting the correct ignition timing is crucial in the performance of an engine. Sparks occurring too soon or too late in the ...
Just as with a boxer-four, piston pairs from opposite banks reach top-dead-centre at the same time, but with a crankpin split of only 60° instead of 180°, potentially giving a shorter and stronger or stiffer crankshaft. For 60° V6s, the crankpins are usually split the other way causing the paired pistons to reach top-dead-centre 120° apart.
This position is also known as the bottom dead center (BDC), or where the piston forms the largest volume in the cylinder. The piston is returned to the cylinder top (top dead center) (TDC) by a flywheel , the power from other pistons connected to the same shaft or (in a double acting cylinder ) by the same process acting on the other side of ...
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