Quote:
Originally Posted by NeilBlanchard
Does it have to be inline? What about splitting into two opposed twins (a la BMW Boxers), or two 90 degree twins (like Ducati or Moto Guzzi)? Each half would have perfect primary balance, and each could have their own counterbalance shafts to reduce secondary vibrations?
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AFAIK there is no such thing as an ICE with perfect balance; it changes with rpms too. It may be minimal, it may be acceptable, but I think if the two are not in synch you will know it!