u/Consistent-Lychee879

Any rough idea with this carb setup relating motorcycle (fluid flow computation rather)

Setup A

28mm Carb on a single cylinder 200cc

Setup B

??mm Single carb for the 2 cylinders of a 400cc 4 cylinder motorcycle

Since theres approximately 100cc per cylinder on the "B setup" and 2cylinders will be utilizing one carb. Is it possible to just use the same carb size of a 1cyl-200cc or there will be a difference on flow rate of air at the carb on the 1carb-2cyl setup?

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Or im gonna use a smaller diameter carb for Setup B

3rd pic carb sizes for reference "A2"