What is the lowest point of a piston referred to as?

The lowest point of a piston within a cylinder is referred to as BDC, which stands for Bottom Dead Center. This term is integral in understanding the operation of internal combustion engines. At this point, the piston is at its furthest position from the cylinder head, indicating the end of the intake or exhaust stroke depending on the engine cycle.

BDC is critical for determining various aspects of engine performance, such as volumetric efficiency and the timing of valve operations. Understanding where BDC is located in relation to the other points in the engine cycle, like TDC (Top Dead Center), helps in comprehending how the engine's timing operates and how fuel and air are taken into the cylinders.

The other terms, such as stroke limit and crank position, might relate to other aspects of engine mechanics but do not specifically denote the lowest position of the piston in this context. Stroke limit is more about the range of motion of the piston, while crank position pertains to the angle of the crankshaft rather than the specific location of the piston.