The distance the piston must travel from TDC to BDC is referred to as the of the engine

The distance the piston must travel from Top Dead Center (TDC) to Bottom Dead Center (BDC) is referred to as the "stroke" of the engine. To understand this concept, we need to look at how an engine works.

An engine typically consists of one or more cylinders in which pistons move up and down. The stroke refers to the distance the piston travels along the cylinder between TDC and BDC.

To determine the stroke of an engine, you need to know the cylinder bore and the crankshaft's crank throw. The cylinder bore is the diameter of the cylinder, while the crank throw is the distance between the crankshaft's centerline and the point where the connecting rod is attached.

To measure the stroke, use the following formula:

Stroke = 2 x Crank throw

By multiplying the crank throw by 2, we get the total distance traveled by the piston from TDC to BDC.

Keep in mind that different engines may have different strokes, depending on their design and application. It's essential to consult the engine specifications or manufacturer's documentation to determine the stroke of a specific engine.