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I’m new at these engines and was wondering if it is possible to
build an engine that would work using a cylinder 110mm in diameter
by 180mm long, what would the size of the power cylinder need to be?
Is it even possible with this length or will i need to cut it down?
Is there some kind of ratio or formula I should follow? Any
information will be greatly appreciated. Thanks

Hi, The lenght of the displacer cylinder should be 3 times the diameter.

for displacer the dimension should be 3:1 (length to diameter ratio) and also the swept volume ratio should be 1.33:1(Vswept for displacer to Vswept for power piston)