Originally Posted by bruce.augenstein@comcast.
Y'know, by your definition, V8s, etc. are also "out of balance".
Nonsense. Yeah, yeah. Harmonics of whatever order. For me, if it is in first order balance, it is in balance. I think we're done here.
V8s are out of balance, both cross planes and flat planes but not for the reason I provided above. That goes back to the reason an inline 4 is out of balance. Large crank weights are required to bring either back into balance.
You need to realize that the term balance is both a practical as well a precise engineering term. Just because something feels smooth does not mean the engine is a balanced design. The word "nothing" as you used also has a precise meaning.
Easy to shrug off the details when you are wrong and don't want to admit it. Just call it nonsense or make up your own personal definition and call the discussion over.