bottom dead centre


Also found in: Acronyms.
Related to bottom dead centre: After Top Dead Center

bottom dead centre

n
(General Engineering) engineering the position of the crank of a reciprocating engine when the piston is at its nearest point to the crankshaft. Also called: outer dead centre
References in periodicals archive ?
Besides the size and length of the pipe from header to tips, one also factors in pressure differentials at bottom dead centre versus halfway towards top dead centre, resonance, timing of the exhaust pulses, valve timing, positive and negative initial and reflected sonic pressure waves and how they behave at various engine speeds (rpms), inertial scavenging and how the evacuation of exhaust gases might assist in the efficiency of the induction stroke.
Starting at the top of the firing stroke, the piston descends to typically 60[degrees] before bottom dead centre when the exhaust valve opens.
And with none of the four pistons hitting top or bottom dead centre at the same time, the crank's inertial torque is non-existent.