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Old 10-06-2017, 08:41 AM   #1
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New Yanmar outboard diesel- perfect for TT35

I just noticed Yanmar's announcement of a new 50 hp diesel outboard in cooperation with a German manufacturer. It is based on common rail injection and has dual crankshafts to reduce vibration from the 2 cyl engine. See:

YANMAR LAUNCHES THE DTORQUE 111 TURBO DIESEL OUTBOARD - Yanmar Marine

Certainly they will be expensive but a pair of these would be ideal for the TT35 if the buyer were going to put several hundred hours each year on them so the lower fuel consumption might pay for them. Not to mention at least double the engine life of a gasser.

David
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Old 10-06-2017, 08:54 AM   #2
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Very interesting.

Suspect the oil change interval will be 100 hours, same as the gassers.
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Old 10-06-2017, 09:08 AM   #3
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"Certainly they will be expensive but a pair of these would be ideal for the TT35 if the buyer were going to put several hundred hours each year on them so the lower fuel consumption might pay for them. Not to mention at least double the engine life of a gasser."

I'm don't think an extra $10,000 in engine costs would be paid back by a lower fuel burn.

Modern gassers can get 14HP from a gallon of gas , modern diesels still get about 20Hp if properly loaded.

Diesel costs more than gasoline , but at lest doesn't die in the tank from Ethanol .

Many small trawler will burn 2-4GPH of diesel, at 3-5GPH on gas a few hundred hours a year might not make back that $10,000 very soon .

4000 Hours is current gas engine life , perhaps double that for diesel inboards.
10,000 claimed by mfg , but it will be a while to see if its just puff.

Not sure if diesel outboards will be problem free , the diesel pod drives do not seem to last long.
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Old 10-06-2017, 09:11 AM   #4
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Thanks for posting. I hope its successful. If it is, others will follow and it will all be good for us.
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Old 10-06-2017, 09:18 AM   #5
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There used to be dozens of these in various HP ratings running around Block Island and the east end in pump out and service boats - maybe 15 years back.
They were in service for many years - wonder what happened to them?
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Old 10-06-2017, 09:29 AM   #6
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Instead of two DTorques, how about one OXE?

OXE - DIESEL OUTBOARD
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Old 10-06-2017, 09:46 AM   #7
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More on the DTorque: https://www.neander-dtorque.com/dtorque/
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Old 10-06-2017, 01:32 PM   #8
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Diesel power would go a long way to improve my opinion of the design as a trawler use type. The anesthetics well that is another issue that hinges on personal preferences. There are a lot of ugly aluminum work and fishing boats in the PNW the bulk of them proving their worth by performance practicality and toughness so to some they are beautiful in a way. Time will tell if the TT35 can earn its wings and I think reliable diesel power would be a leg up. Many of the proven and time tested PNW aluminum boats would be in direct completion with this design and if aesthetics is not a big issue I would go diesel and aluminium.
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Old 10-06-2017, 04:16 PM   #9
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Quote:
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Diesel costs more than gasoline , but at lest doesn't die in the tank from Ethanol .

???

Marine -- i.e., at the fuel docks -- gasoline around here is more expensive than diesel...

-Chris
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Old 10-06-2017, 05:35 PM   #10
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???

Marine -- i.e., at the fuel docks -- gasoline around here is more expensive than diesel...

-Chris
Every place we stop for diesel fuel on our way south has gasoline priced significantly higher than diesel.
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Old 10-06-2017, 06:19 PM   #11
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Guess it's regional - not the case on the mid-Gulf.
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Old 10-06-2017, 06:38 PM   #12
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First, I'm not convinced a new product is going to be more dependable than mature products used for decades nor am I convinced there would ever be a payback.

However, a more basic issue. Even the attempt seems to be an effort to fix a problem that doesn't exist. Only in the trawler world does there seem to be such an aversion to gas. There are economical and dependable gas outboards that do the job just fine.
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Old 10-06-2017, 09:46 PM   #13
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We have been using the Yanmar diesel outboards (D27 and D36) for many years and still do, (although out of production some years back) the last units we purchased around 2010 out of Australia cost AU $ 24'790,(36 hp)

These units take a beating from our third world boat crews but keep on running, although down on horse power the torgue is amazing to say the least, yes oil changes are recommended @ 100 hours but spin on filters and small lube capacity it's not an issue, I guess the biggest draw back we find is their weight @ 100 kg's - 120 kg's (Dry).

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Old 10-06-2017, 10:49 PM   #14
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First, I'm not convinced a new product is going to be more dependable than mature products used for decades nor am I convinced there would ever be a payback.

However, a more basic issue. Even the attempt seems to be an effort to fix a problem that doesn't exist. Only in the trawler world does there seem to be such an aversion to gas. There are economical and dependable gas outboards that do the job just fine.
diesel OB is not new and is very well tested particularly in commercial use. The reason it was pulled from US market had nothing to do with mechanical function it was an environment thing. OB & diesel does have its good side and when applied and fit to good use makes sense on some boats. I think with advanced engineering we will see the return of the aborted OB diesel market.
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Old 10-06-2017, 11:06 PM   #15
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TO NOTE: Yanmar claims the new outboards fall well within the latest EU RCD 2 limits.
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Old 10-06-2017, 11:30 PM   #16
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What I still don't understand is why is there a need for diesel OB's for recreational use?
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Old 10-06-2017, 11:49 PM   #17
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What I still don't understand is why is there a need for diesel OB's for recreational use?
With diesel OB tender, single fuel on board. Important for some.
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Old 10-06-2017, 11:58 PM   #18
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With diesel OB tender, single fuel on board. Important for some.
But then that's an application where the weight of the diesel is most negative.
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Old 10-07-2017, 01:00 AM   #19
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But then that's an application where the weight of the diesel is most negative.
Not necessarily. For larger tenders and not wanting high speed its fine.
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Old 10-07-2017, 07:21 AM   #20
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I looked at the DTorque website that someone posted a link to. It has a displacement of 0.8 liters and is turbocharged. Making 50 hp that means it produces 63 hp per liter which puts it in the range of most current turbocharged, common rail engines.

I don't think you can make any comparisons with the old Yanmar O/Bs. Those used the GM block I believe which was 1 liter and produced 27 hp and did not have a turbocharger. The old GM engine was very robust and had a long life.

This new engine uses an all new crank system which has no long term history. Time will tell how it holds up. I wouldn't buy one until I see how it does after a few years.

The target market is for European commercial workboats that put a lot of hours each year on them and can benefit from the lower fuel consumption and the hopefully longer life.

It will take a unique customer that can benefit from the new diesel in a TT35: One that cruises fast so the fuel consumption will be important and puts several hundred hours each year on his engines.

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