My motor is a standard block for a 150hp version, derated to 100hp. No weight or size savings that I can tell. It runs a lower rpms and is quiter. The turbo and injector system do improve fuel economy, but that just seems silly in a sailboat that doesn't burn much in the first place. Again, makes more sense for a stinkpotter or truck.
Sailboats just have small motors, so I guess I don't really understand the need to make them smaller and add turbos.
I need a new $3k turbo for my motor. I'm jaded, for sure.
I understand the drive for smaller/more powerful, and the weight reduction associated with a smaller block delivering higher hp for a lot of boat applications. For a cruising sailboat not so much though. My son's boat has a Yanmar engine, 55 hp, with a turbo and it died while they were in Florida ready to depart for an extended cruise to the carib (the $1500 turbo would have cost $3000 in the Bahamas). The first replacement turned out to be defective, the second took over a week to arrive. This was in Ft. Lauderdale, Fl. How long would it take in Tonga, or even Prince Rupert, BC for that matter (if you could get there without the engine). Keep it simple, or carry a spare.
I don't disagree at all. I guess my main point is turbos are much more reliable now. OTOH, there are many turbos sold that are not superior but in fact inferior and not a lot better than those years ago. I don't know diesel marine motors having never messed with them and I don't know diesels like I do turbo gas motors. If you stay with Garrett yada and buy the good stuff it will generally last. I don't consider my turbos to be a fail point on my engine but this may be apples to oranges with a marine low hp low rpm diesel.
If I had a freakin boat I would worry about many other things besides turbo vs NA. I don't see any practical application for a turbo on a cruiser except for one major point. IF you can put a smaller but as powerful replacement engine in a tight spot and gain more practical access by doing so then that's something I'd greatlyconsider.
I think fuel economy is something many would consider depending on how much they motor. From talking to some they use their motor a lot. I don't know the difference in fuel economy between a newer turbo diesel vs a newer NA one. I highly suspect both are more efficient than an older diesel. The use of a computer and direct cylinder injection helps here and I don't know how much more efficient a turbo makes it when you are talking about pushing a small sailboat. Diesels are already more efficient than gas motors in general and it may be a smaller combustion area with higher cylinder pressures as in a turbo application would make it even more efficient. I don't know that or that it would make a lot of difference to many sailors.
You can also start getting into the area of cylinder head design and even incorporating the exhaust into the cylinder head in some of the newest applications. I don't know how much of this has actually moved into the area of marine technology much less sales and use.
Most of this is just for discussion. If you're like me you just want a motor which cranks up when you ask it to and doesn't cause problems with as little maintenance as possible.
I have a question for those with the newer motors. Do you have to watch the quality of fuel used and do you have to maintain your fuel filtration more closely?