Bore
(engine)
There
are two main factors which can influence the cubic capacity
of an engine cylinder, stroke and bore. Bore relates to the
width of the cylinder the piston is housed in. The larger
(wider) the bore is, the larger the capacity. The smaller
(thinner) the bore is, the smaller the capacity.
The cylinder bore is the inside diameter of an engine cylinder. It is
measured in millimeters (mm) or inches. Knowing the cylinder bore, the
cylinder area can easily be worked out using the formula for the area of a
circle (area = pi x the radius squared). Then if the stroke (the distance
the piston travels one-way within the cylinder) is also known, it's
straightforward to work out the displacement for each cylinder (bore x
stroke). Multiplying this figure by the number of cylinders gives the
total engine displacement (often referred to simply as the "engine size").
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