w8ye the principle is the same. All engines have some means of counterbalancing the rotating weight of the rod journal, rod and part of the piston. This consists of a weight attached to an extension of the crankwebs.Thedynamic damper is similar to this but the weights are not rigidly fastened to the webs. They can move slightly, and are designed so that they can oscillate between ignition impulses and accelerations and decellerations of the crank and cancel out the fluctuations.I believe it would make a bigger difference on a single cyl engine. I should try it on an old Quadra 35 .Just have to figure out how to make an instrument to measure engine vibration to get a comparison.