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why is stroke unit being in inches? isn't it strokes stands for No. of stages? like intake, compress, burn, & exhaust (3:48)
The stroke of an engine refers to the distance the piston travels inside the cylinder during one complete movement, from top dead center (TDC) to bottom dead center (BDC).
When we say a stroke is 4 inches, it means the piston moves a total of 4 inches within the cylinder.
You’re also correct that the term “stroke” can describe the different stages in an engine’s cycle — intake, compression, power (combustion), and exhaust. Each of these stages involves the piston moving through its stroke.
However, when stroke is given a unit of measurement, it’s referring to the physical length of that piston travel, not the number of stages. This measured distance is important when calculating things like engine displacement and volumetric efficiency.
In short, in that part of the lesson, “a stroke of 4 inches” simply means the piston moves a total of 4 inches up and down inside the cylinder.
