16v149s at Newport Show

Is that a old 2 stroke Detroit? V16, 149CI per jug?

I think they ended production around 1600HP each which means 100GPH PER ENGINE at cruise. Hope she carries huge tanks (and credit line ;-)

Repower and add a stateroom.

Already been done, with MTU 16V2000M93's rated 2400hp each, stretched to 91ft.

http://www.unlimitedyachtservices.com/YTG0810_018_copy.pdf

Absolutely stunning......Google Sportfisher Alessa Leigh for more detailed pictures.

Not really. A 1650HP C32 acert burns 70 gph at 80% load
a 2000hp 16v2000 burns 75GPH at 80%

compared to 100 gph??? And both of the motors above would net a higher cruise speed as well.

I am curious to hear reports on reliability, who cares about fuel burn if you have techs onboard every other month.

The 16V2000M94 is up to 2600 hp now if I remember correctly? Not sure if there is a duty rating difference between the M93 and M94.

Is it better to stick in a pair of M94s and run them easier ... Or a de rated motor and run it harder.
Any horror stories on the 16v2000 at any rating?

I believe the Alessa Leigh got the 1st pair of 16V2000 engines rated at 2400hp in the states, but the refit took awhile before commissioning. The owner had all exterior surfaces/castings of the engine ground/polished smooth before painting in Fire-Engine Red - they are a work of art.

The question you pose is not so easy to answer for any diesel because of so many factors:

Boat Design and Hull Resistance/Machinery Installation/Sufficient Engine Room Air Intake and Exhaust/Fuel Quality/Operating Load Profile/Weight and Trim/Geographically Location - Tropics or more temperate climes/Propeller and running gear design/How the Owner/Captain operate the vessel as well as whether they follow a maintenance program/etc.

With higher hp you have the ability to extract more speed if the conditions are favorable and your pocket book is sufficient, but you will never see those numbers with lower hp.

So it becomes a choice

Hatteras 100 now comes standard with CAT Acert 32's rated at 1900 hp and optional with MTU 16V2000M94 at 2600 hp which is still rated by MTU as for high speed, light load. It really seems to me that a 12V4000 perhaps detuned a bit, maybe even a 12V4000 M73L at 2897 hp would make a lot of sense instead, just looking at what other manufacturers put in similar boats. Similarly others who use the 16V2000 for boats that size, tend toward a M91 at 2000 hp at 2300-2350 rpm instead of 2450. The boat weighs a lot for a 100' glass boat at 275,000 pounds, comparable to most 115'-120'.

Actually in 100'+, MTU is the leading seller. MTU plus CAT totally dominate the market. The percentages are amazing.

Now there are some builders who have had excellent service histories with MTU's perhaps due to appropriate sizing, selection of engines, and other factors. Perhaps due to emphasis on routine maintenance.

Now, everything else being equal, I might well choose CAT but everything else is seldom equal. Size is often a factor in placement. The 3 CAT suggestion you make wouldn't fit on most boats. And sound is definitely a factor. While I would never criticize CAT, I also don't agree with your strong condemnation of MTU even though I do very much respect your experience.

Multiple Trouble Units???

What??

MTU= Multiple Trouble Units.