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Explaining engine harmonics in a few paragraphs, without illustrations... sheez
Wikipedia does have some descriptions of every different engine combination. Basically, you're nearly always damned in same fashion. Every engine has some quirks and you have to make the right tradeoffs for a sales success.
Stroke length, the angle of separation between piston banks, the engine skirt length, the motor mounts, all play a large part for the sensations sent back to the occupants. It's not just the number of cyclinders.
Sometimes a little vibration is good. Engines can be so smooth that they do not telegraph "power" back to the driver.
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