A 4-cylinder engine has a bore of 3 inches and a stroke of 3 inches. What’s the total piston displacement? A. 72 B. 85 C. 95 D. 80

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Otis Campbell Profile
Otis Campbell answered

A 72 cc

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Tom Jackson
Tom Jackson commented
Program Formulas and Procedures:

cu.in. displacement of a cylinder = (bore^2) ( π ) (stroke) / 4
CID = V =3.14*r^2* h / 4

Piston bore (the diameter of the cylinder) squared times 3.14 (or π) times the stroke (the distance the piston travels up and down) divided by 4.
(We divide by 4 because we squared the diameter.)

(3.14 x 9 x 3) / 4 = 21.195 times 4 cylinders = 84.78

Which would lead me to answer B = 85cc

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