I have a spare 13 horse Honda engine laying around and a need for a vibratory compactor. My thought was to use the engine to drive a shaft attached to two pillow block bearings. The shaft would have a piece of square tubing or something else welded to it to create the "off balance" effect.

Yes I know I can rent one but I need it for several different things and not all at the same time if that makes sense.

Any ideas on the proper way to build the out of balance shaft? Such as how much weight and how far from the centerline of the axle it should be?

Thanks,