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@MurrayM: Well, then if you have the same fuel burn as me, you should be good for almost four months. For reference: My four-ish liter per day figure was achieved with two people living on board, cooking with genset electricity, burning diesel to keep the boat warm, and moving her every two...

Sand blasting, then 5-7 layers of epoxy is usually good for 10 years in sea water. There are no modern substitutes. "Lead red", a suspension of lead tetroxide in linseed oil, is much easier to deal with since it doesn't require the same standard of surface cleaning. Sadly, it's as illegal...

I use my autopilot to maintain a given heading when navigating open water, and to assist in holding the head to wind when preparing lines while single handing. If used correctly, it improves your situational awareness immensely, and for that reason I consider it essential equipment on all but...

Two months isn't difficult at all. I get about a year out of my 1.500 liters, so with a water maker on board, most modern motor yachts (even fast ones) should be able to loiter for months.

Superlatives fail me. Thanks for the inspiration :-) I'll be embarking on a similar project soon with significantly worse starting point.

For a passage maker in the mentioned size bracket I'd most definitely go for a sailboat, but that wasn't the question... forced to choose a motor boat, I'd go for something like this or this with suitable modifications. As for actually contributing to the thread, many of Bruce Roberts' designs...

I now have oatmeal porridge on my laptop. Thank you :-P

It's not quite that simple. The turbo allows you to run at higher power densities, but that margin can be taken out as fuel efficiency, engine longevity or power. In smaller "high performance" engines the manufacturers tend to maximize power output, but there are other examples. I mentioned...

@Stubones99: That's a nice boat, evidently finished to a high standard. Nice find, thanks for sharing :-) Not one of the engines I was talking about, but still a nice one. @Sunchaser: With oil as a cooling medium, you get lower potential for mineral deposits, zero potential for galvanic...

Deutz manufactures a range of oil cooled NA diesel engines that are well suited for marine use. They are popular in standby applications (lifeboats, emergency gennies, large vessel thrusters, etc) because the absence of water in the cooling jacket makes for superior resistance to neglect, which...

Interesting. That does at least provide some packaging benefits over Wärtsilä's system, which uses an entirely separate turbine for electricity generation. I wonder how this scales down? I suppose it might find a niche in short-haul applications in combination with a clutchable PTO generator...

@stubones99: I think you misunderstand me. I would never suggest driving a rubber belt of any kind off a turbo. Allow me to rephrase: Varying load conditions on small / short haul engines pose a challenge because exhaust turbine driven power generation would only be available at higher load...

@OP: As mentioned above, range is an important consideration in your case. I'd go for a single over a twin for any long range work, due to the superior fuel economy on offer. The 6LY is a beautifully constructed engine, and there are plenty of fishermen out west who stake their lives on its...

To each his own. To me it's about arriving at the other side, an experience which is intrinsically linked to the time spent at sea. Having something you've never seen before rise out of the horizon after getting beat up for two weeks is absolutely magical. The time at sea does have its own...

@Ski in NC: Very well put. I'm curious, though - are you sure that a DD won't run with the blower taken off? I know for a fact that a B&W Alfa will run with the reed plates taken out of the scavenging air pump, albeit like absolute fecal matter. That one uses loop scavenging, and the DD's...

Indeed they do, as do the 92s (and I believe the 53s and 149s) but not the 51s. However, blower displacement is closely matched to scavenging air demand, so there isn't really much over pressure being made. The blower is there to ensure somewhat acceptable scavenging when the engine is...

Fair point; There are bunches of factors affecting turbo longevity, and larger turbos do live longer - my experience is far from all-encompassing there. I do stand by my statement that the life of the turbo itself is the limiting factor with turbocharged diesel engines, though. As for the...

I actually do this for a living, but anyway... the example you give of premature wear in jimmies is related to higher power densities, not the mere presence of a turbocharger.

That depends. A compensated pump you don't really have to touch, and for an uncompensated one you could just turn the rack limiter screw. You might wanna change the pump cam anyway, though, to maintain sensible injection durations, but then you also need to consider the injectors, and... I'm...

I'd go for an arctic fisheries inspection vessel, if given the fuel budget. They're pretty much made for the task, and are fantastically comfortable boats compared to some of the other serious machinery suited for such an endeavor. For your $100-200k you get: 100' length. 6-10 separate...

Hi, I stumbled onto the Trawler Forums while looking for information on Becker rudders, and started reading this thread as I have considered de-turboing my main engine. I finally registered in the hope of dispelling a couple of common myths about turbocharges. #1 - Turbodiesels are inherently...