Making sure you realize a 3.0 is a 4 cylinder. So if he thinks a 6 cylinder would labor a 4 definitely will be way underpowered.
Oops, I was thinking of the 4.3. Yes, I believe a 4 cylinder would be very under-powered, the 4.3 would probably be ok, but not great.
They under-power them to keep the price tag down. Will it get you from point A to point B, yes, will you be pulling a slalom skier out of the hole with 5 people in the boat, no way.That's good info. Just wondering why they would under power it. Is there anyone out there running a 3 liter? How do they do? For a 17 to 18 foot boat what is the most common engine?
My parents have a Bayliner (Capri, I think) 19 with a 3.0 / 140 Merc. For run-of-the-mill skiing (3 adults in the boat) or cruising (with several people on board - say, 5 adults) it runs fine. No one's going to write songs about it, but it'll hold high 30's.
Ok, hears a thought, what is the "proverbial Toyota" of the boating world. You know, the one you can't kill? Is there such a thing?
I would be willing to wager that a 3.0 burns less fuel than a 2 stroke 50hp. In a a boat light enough for them to push they are great motors.