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17 Piston Engine Fundamentals TC010-05-01S Bore, Stroke, and Displacement
Bore, stroke, and displacement are measurements of the cylinders and pistons in an engine. These three measurements are shown in Figure 10. Bore is the diameter of a cylinder, usually expressed in millimeters (mm). Stroke is the length of piston travel between TDC and BDC, usually expressed in millimeters.
The displacement of a cylinder is the volume of the cylinder between the
Generally speaking, engine displacement is a rough indicator of power
FIGURE 10. Bore
Bore (mm) TDC BDC Stroke (mm) Displacement (cc or L)
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