Nah the A/C & Altenator pullies and the belt spinning cause vibrations and thats why the crank pully has a damper, balance shafts are designed to cancel out the overall vertical shaking forces inherit in inline-4 engines.
Ever drive, say, an inline-6 engine and then an inline-4 right after? The 4 sounds and feels so much more angry and thrasy in comparison when pushed hard..
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