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Old 12-22-2019, 03:00 PM   #1
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300hp Diesel Outboards

WOW. Nice except for the price tag. 40hp some day?

https://www.powerandmotoryacht.com/v...esel-outboards
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Old 12-22-2019, 03:07 PM   #2
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Cool!
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Old 12-22-2019, 04:17 PM   #3
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I’ll be curious to see if the commercial guys buy in. At double the price to comparable hp gas engines the recreational market might be a tough sell. How many gas engines get worn out? It will be interesting to see the performance numbers of these vs gas though, that might be the main selling point.
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Old 12-22-2019, 04:23 PM   #4
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Nope, at $55K each I'd never be a player for something like that. Nice idea, great concept, poor presentation and production.
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Old 12-22-2019, 04:29 PM   #5
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These new diesel outboards were developed for the commercial/military market where diesel is often the only fuel available or is mandated.


But I have to hand it to them for making them fresh water cooled which provides much longer life than the typical outboard. I suspect 99% of outboards die of corrosion, not internal wear.



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Old 12-22-2019, 05:37 PM   #6
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The Yanmar diesel outboards never took off either.
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Old 12-22-2019, 06:57 PM   #7
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They are very expensive but I suspect you will be seeing them on DNR, Coast Guard, and in the commercial market.

My 120 hp F.L. is all I need.

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Old 12-22-2019, 07:14 PM   #8
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Greetings,
They have the right idea in Thailand IMO. Longtail boats.






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Old 12-22-2019, 07:38 PM   #9
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Its interesting that gas outboards started small....and then grew as time went on....the Diesels start out big...hopefully they can shrink over time. Something like a 150 or 200 on a boat like the TT35 ( sans production issues ) would be a home run I think.
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Old 12-22-2019, 08:27 PM   #10
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Its interesting that gas outboards started small....and then grew as time went on....the Diesels start out big...hopefully they can shrink over time. Something like a 150 or 200 on a boat like the TT35 ( sans production issues ) would be a home run I think.
The Yanmar diesel outboards of around 20 years ago were 30hp from memory

Trying to find that info I see Yanmar are trying again

Quote:

DTORQUE TURBO DIESEL OUTBOARD ENGINE - 50 HP
The Neander Dtorque turbo diesel outboard engine sets a new benchmark in diesel engineering. The 804 ccm twin-cylinder aluminum powerhead delivers 50 hp at the propeller shaft
https://www.yanmarmarine.com/dtorque/
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Old 12-22-2019, 10:13 PM   #11
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Greetings,
They have the right idea in Thailand IMO. Longtail boats.
CWAZY!!
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Old 12-22-2019, 10:42 PM   #12
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There are continued efforts on diesel outboard. Perhaps there is some potential on commercial boats. However, giving those 300's on the boat they were on a quick look, I see the following issues. 1-Cost-Double 2-Weight-50% more. 3-Performance, specifically on that boat with twin Yamaha 425's, it will run 62 mph vs. the 38 mph of the Cox Diesel and it would run between 50 and 55 mph with twin 300 Yamahas.

I keep waiting for Cox and a boat builder to pair up a pairing that makes sense in the market. Perhaps a trawler outboard where speed and weight aren't really factors and then see if anyone will pay for the convenience of diesel.
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Old 12-23-2019, 07:31 AM   #13
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Interesting article. While I understand the comments about cost, perhaps they miss the potential savings. The trial is on a speed boat. Consider one or two of these downrated to trawler engine sizes. Using outboards vs inboards frees up tremendous space - engine room becomes a utility room. Apart from saving inboard engine cost, it saves transmission and drive components including shafts and props. Installation costs are substantially lower. So, I think there are a number of beneficial offsets to the cost, which will likely come down if the consumer market accepts the approach. Though, my guess is installing one of these vs the conventional approach will save money even today if all costs are figured in. On the other hand, I always thought the US did not permit diesel outboards for environmental reasons.
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Old 12-23-2019, 07:44 AM   #14
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I always thought the US did not permit diesel outboards for environmental reasons.
Generally specific technologies aren't banned, but it's quite likely that up to this point, it's just been too hard to make one that meets the emissions requirements and is affordable enough and practical. Plus, weight is a concern for outboards and conventionally, diesels are heavy.
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Old 12-23-2019, 08:58 AM   #15
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I can see o/b's being designed onto/into naval architecture for new boats; wherein weight distribution can readily be factored into a boat's design.

General circumstances regarding pluses/minuses on many fronts of i/b - vs - o/b will be sussed out by boat designers and owners.

What I have hard time seeing is adding o/b's heavy weight as new power source to the back of boats that originally were designed for i/b engine[s] weight placement. Problem here is weight distribution and therefore altered boat handling conditions in and during many types of sea conditions.

I know that "ballast" can be added to [best as possible] overcome some of the weight distribution change... But... IMHO, a boat that needs ballast-weight haphazardly added in order to try and compensate for some other substantially altered weight distribution circumstance is simply not the wisest maneuver to do to any boat.
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Old 12-23-2019, 09:19 AM   #16
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Admittedly usually midships, but combined weight of 500 gallons diesel, 250 gallons water, and 25 gallons of blackwater is approx. 5,700 lbs. that could be positioned more forward to offset stern weight. Also, figure the weight of prop(s), drive shaft(s) that are no longer at the stern, and heavy batteries that can be relocated from engine room. While I agree that refitting an existing boat would be a challenge and not worth the effort, I can easily see the advantages of new designs with outboard(s) vs inboards. Just think, engine replacement - disconnect a few cables and fuel lines and get a crane, not to mention easier access for dockside repairs!! For practical purposes access for all routine maintenance would need to be accessible from the vessel - can't see standing in the dinghy trying to change a part while underway!!
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Old 12-23-2019, 09:40 AM   #17
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Admittedly usually midships, but combined weight of 500 gallons diesel, 250 gallons water, and 25 gallons of blackwater is approx. 5,700 lbs. that could be positioned more forward to offset stern weight. Also, figure the weight of prop(s), drive shaft(s) that are no longer at the stern, and heavy batteries that can be relocated from engine room. While I agree that refitting an existing boat would be a challenge and not worth the effort, I can easily see the advantages of new designs with outboard(s) vs inboards. Just think, engine replacement - disconnect a few cables and fuel lines and get a crane, not to mention easier access for dockside repairs!! For practical purposes access for all routine maintenance would need to be accessible from the vessel - can't see standing in the dinghy trying to change a part while underway!!
"... can't see standing in the dinghy trying to change a part while underway!!"

LOL X 2

Many items to overcome. If o/b's can become an often desired option there will be another sales point for boat builders to "sell" people on.

Myself... preferred engine and driveline layout in power boats will likely remain as i/b engine hooked to direct drive transmission ratio with through hull shaft and prop.
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Old 12-23-2019, 09:44 AM   #18
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Admittedly usually midships, but combined weight of 500 gallons diesel, 250 gallons water, and 25 gallons of blackwater is approx. 5,700 lbs. that could be positioned more forward to offset stern weight. Also, figure the weight of prop(s), drive shaft(s) that are no longer at the stern, and heavy batteries that can be relocated from engine room. While I agree that refitting an existing boat would be a challenge and not worth the effort, I can easily see the advantages of new designs with outboard(s) vs inboards. Just think, engine replacement - disconnect a few cables and fuel lines and get a crane, not to mention easier access for dockside repairs!! For practical purposes access for all routine maintenance would need to be accessible from the vessel - can't see standing in the dinghy trying to change a part while underway!!
I can see a lot of advantages to outboards, but not to diesel vs. gas. I have a friend who is a captain and has run a Tiara 43 LS several times recently and it's a very impressive boat with triple Yamaha 425's. It outperforms a similar Tiara with twin 725 Volvo's or 715 Cummins at a significant cost savings. There are now some very large center consoles with outboards, several over 50'. A few "pocket trawlers" with outboards and very happy owners. The expansion continues and outboard diesels continue to be discussed, prototyped and even built, but haven't yet been successful at creating a market.
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Old 12-23-2019, 07:49 PM   #19
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One draw back to outboards....is that a 30 foot inboard becomes a 35 foot outboard, with the accompanying increase in marina/dockage/storage fees.

I would think some of the weight could be offset by a deep, hollow ( or foam filled ) swim platform.
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Old 12-23-2019, 08:58 PM   #20
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One draw back to outboards....is that a 30 foot inboard becomes a 35 foot outboard, with the accompanying increase in marina/dockage/storage fees.

That is what Miz Trom was complaining about when they found their 35 foot TT35 was actually 43'.
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