Evenly spaced crank throws and therefore reciprocating masses should have a better chance of smoothing out the vibrations simply than a 4 cylinder with extra complications such as counterbalances.
Whether 3 cylinders is smoother than 4, by virtue of more power strokes per unit time (with the 4 pot motor), might be debatable.
Now, get to 6 cylinders or 8 and the engines are really smooth and mostly vibration free, except for the rocking couples associated when the cylinders are arranged in V formations (for a shorter, stiffer crankshaft).
So 5 must be a good compromise...best of the bunch, perhaps.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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