24v71's

Hi,

I would say - It is either a typographical error or experimental engine from DD or something built by a specialist like the guy who does the 96 Series engines.

From what I recall, they were a short-lived engine from the mid-1990's. I've only seen them in standby generators, but a quick google search turns up several yachts from the same era with them installed.

Quite a few vessels listed as having them fitted. Like the better known 16V variant which was essentially two V8 blocks bolted together, the 24V's had two V12 blocks bolted together...briefly gave Detroit Diesel something to put up against the MTU 396 series.

I haven't heard of them much before, nor do I know much about them. BUT, I wouldn't automatically assume they're a bad engine. I don't think many 24 cylinder engines make it into yachts period. So they probably made a few hundred sets and then there just wasn't enough demand for them, or that's when MTU bought out DD or who knows. It's pretty rare to even see 16v92's in comparison to 12v71's or even 12v92's. Most of the yachts of the time, even 100'+ were only using 12v71's and 12v92's mostly when it came to DD's. BUT, parts should be pretty easy to get in comparison to other 24 cylinders because they share most of the 12v71 parts.

Hi,

I found someone who seems to have more than a passing interest in the sound Detriots make when running.

He has a table of the various models and when they were produced, the 24V71 is only shown as being produced for one year - 1997

http://www.telusplanet.net/public/ryq/

Wikipedia also has a bit on them.

http://en.wikipedia.org/wiki/Detroit_Diesel_Series_71

Which makes sense because MTU bought out DD sometime shortly thereafter 1997. Also, they then stopped making the two-stroke detroits entirely I think right around 1999. Therefore there would be no more 24v71's made or any other 2 stroke. MTU then started focusing on the 16v2000's and getting them to make the same horsepower 1800, then 2000hp, then 2400hp..... and also the 16v4000's.......

Both Delta and Trinity used the 24v71's in the mid 90's.

I have an old friend who was captaining a 110ft yacht that was kept right across from Atlantis. It was an odd brand that I don't recall but it was a late 80's early 90's boat and I do remember him telling me that it had 24V71's and they were two 12V71's mated together.

Sorry those details are no the best, but it sounds they are out there in a few yachts.

That boat got repossessed and my buddy is running another boat now.
Early last year Yachting did an article on the Bahamas and they spent the week onboard the boat with them.

Name of the boat is Destiny, it's a 110 Hargrave I believe. It was repossessed and is sitting in Pompano Beach for sale now. It has 24v92's in it. It's the only set I've seen, and I'm pretty sure we're talking about the same boat......as it was repossessed from the Bahamas.

I wonder how the 24v92s are set up is it 3 8v92's blocks or 2 12v92's put together which is basically 4 6v92's, just curious.

Gmax

Hi,

I dunno anything about a 24V92, there is something on Wiki about a 24V71

http://en.wikipedia.org/wiki/Detroit_Diesel_Series_71

Yes, that is the one. My friends Mike and Trini were captain and crew of that boat for years.

I've never seen a 24V92 main propulsion engine either, only a 16V92. But if they exist, I'd say they would most certainly be based on two 12V blocks bolted together, as on the 24V71's
Going back to the basic configurations, 71V and 92V blocks came in 6, 8 and 12 cylinders. The 16V71's and 16V92's had two 8V blocks mated together rear end to front end, and the 24V71 had two 12V blocks bolted together the same way.
IIRR, the 16V's had two V8 sumps, the 24V (71) had one, purpose designed.
(edited, memory wrong, marine engines had single sumps so it seems)