Total Displacement

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

In engine design, the total displacement is the amount of volume displaced by engine cylinders.  It is measured in cubic inches, cubic cylinders or liters.

Total Displacement formula

$$\large{ DISP = NOC \; \frac{\large{\pi}}{2} \; BORE^2 \; STROKE }$$
Symbol English Metric
$$\large{ DISP }$$ = total displacement $$\large{in}$$ $$\large{mm}$$
$$\large{ BORE }$$ = cylinder bore size $$\large{in}$$ $$\large{mm}$$
$$\large{ NOC }$$ = number of cylinders $$\large{dimensionless}$$
$$\large{ STROKE }$$ = piston stroke length $$\large{in}$$ $$\large{mm}$$