A 22 foot what?
What kind of 22' boat? Weight, windage and freeboard, will be a factor.The J22 that I sail has a 4hp Nissan. Adequate for a lake - even when powering into a nasty squall windstorm or thunderstorm microburst.A heavier boat, or one with more windage to the hull, a cruiser, may need more power. For most 22' sailboats, I would think more than 6-8hp overkill, 25' boats typically only need 8-10.I think I'd go with a 6hp motor for a 22' cruiser that was heavier and has more windage than the J22, as 6hp weighs similar to a 4hp, at least with the newer Nissan/Tohatsu; and an 8hp is quite a bit more weight. I would want to keep sailing performance high.OC