DD 8V-92 DDEC III (760 HP) for long-range cruising

What style boat are they in? In all reality in most situations they're 2000-2500 hour engines between majors. Parts and so forth are available but might not be instantly available at a local dealer. You can run them slow but need to run them at cruise every 6 hours for about 30 minutes to clean them out. They're more efficient at and under 1000 rpms than modern 4 strokes by a good bit. I ran a 75' Hatteras motor yacht with 12v71TIs at 1000 rpms and we did 10 knots at 12 gph (both). I could live with the detroits but would much prefer 4 strokes from that era such as CAT 3406's.

I wouldn't be afraid of 8v92 mechanical engines at all. There are plenty of parts available, I just bought 6 cylinder kits and gaskets and everything was in stock. The DDEC part is a different story. There are quite a few people on here who have had lots of issues with the electronics . I personally wouldn't consider owning a DDEC engine.

They have a supercharger which makes them very efficient at 1000 rpms and under. Yes you could run them that way, but I'd plan on running them at cruise rpm's every 4-6 hours for 30 minutes, probably could get away with every 6 hours with DDECs

Rarely, but yes just like anything. I've had an ECM go bad once.......some engine control stuff such as a shifter solenoid.....but was able to find it. Personally like I said earlier I'd be looking for 4 stroke diesels. Cats in that era and HP were very good, MAN's were also good.

We have 1989 89v2s @735HP in a 60MY, 87,000lbs. Both motors have 4300 original hours on them. We are rebuilding one now. All parts for the major were available. We run 1350rpm to get 10kts which is our hull speed. With either the 20KW or 8KW running I plan 15 gallons/hour. The real burn is around 13 gallons per hour. Every few hours we run it up to 18-1900rpms for 10 mins. Hope this helps.

In the big scheme of things, I'd rather be in possession of The Boat that I love and pay to replace the iron than to hunt for the boat with the preferred iron and then pay to turn it into the boat that I love.

If he luvs the boat, then get it, re-power & cruise happily under a warranty for a long time, uh?
Brother DOCKMASTER and others have done this.

As long as I'm here;
I am a large DDC fan.
Been tinkering on them most of my life.
CF-2 oil and blood does mix well.
Been known to sleep under my 71s.

DDEC was Roger Penskies attempt to modernize DDC and get on the electronic band wagon.
It was never fully developed or finalized. Just something that worked mostly but proved that a smart injector was in DDC's future.
It was also enough to attract MTU's attention.
The latest version can still produces codes that the mfg engineers can not explain what they mean.
I have messed with some of it when I had to. Was lucky to fix every bug, bad wire, bad connection, bad battery.
Always called it Pandora's Box.
IMO you want reliable long range cruising, you don't want DDEC in your future.

In the DDC line, there is no less forgiving engine that the 92.
IMO you want reliable long range cruising, you don't want a 92 in your future.

I believe Brother Rtrafford typed it well above.
Pick up the boat that you luv and put in power that you will luv also.
Your ship will luv you back while your cruising reliable without many concerns,,, except maybe,,, where to pick up some ole rum and me..

Shame DDC never mass produced their 24V71. Now that would have been bombproof.

New MTU 4000 are also very capable of producing error vodes no one can explain.

MTU= Multiple Troubled Units.

Hello Brother K1W1.
Hope all is well.

Yes, I hear of these same issues but I am glad to report,,, I don't see any big MTU stuff in the swamps we work in these days (since retirement).
Once in a blue moon, services some Series 60 MTUs but been a while on even those.