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Ok so if both have 2L of total displacement, each cylinder of a 4cyl engine has 0.5L displacement. Each cylinder of a 8cyl engine has 0.25L displacement.
Volume for a cylinder: V=pi*r^2*h
Surface area of cylinder: A=2*pi*r^2+2*pi*r*h
For the 4cyl and stroke of 1cm, 0.5L = 500cc
500 = pi*r^2*1
r = 12.62cm
As = 2*pi*12.62^2+2*pi*12.62*1
As = 1079.98cm^2
For the 8cyl and stroke of 1cm, 0.25L = 250cc
250 = pi*r^2*1
r = 8.92cm
As = 2*pi*8.92^2+2*pi*8.92*1
As = 555.98cm^2
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