Last week, I stopped by a boat dealership looking at some of their jetboats on the lot. Soon, a salesman walked over and in a friendly and helpful manner inquired if he could answer any questions. We talked a few minutes about the nearest boat with a mercury 200 hp sportjet.
I don't have a boat with an inboard, although inboards interest me and maybe someday I might like to own one. So after the salesman tells me a few things about the sportjet, I ask, "Do you have any V-8 powered jetboats for sale?" He said, "V-8s are dead." He went on to describe power-to-weight ratio advantages of the sportjet and its superior fuel efficiency. He also said that V-8s are no longer the best inboard motors having been originally designed for automotive use, and not optimized for constant high rpm use.
So, I'm wondering if it's nowadays widely believed that V-8s are obsolete for jetboats? Sure, they're about twice as heavy as a 200 hp sportjet, but aren't V-8s the only practical way to get more than 300 horsepower? By the way, which is more reliable, the sportjet, or a V-8?