"New" Diesel 50 hp outboard by Yanmar

T

thataway

Active member
Yanmar is again touting their 50 hp diesel outboard

This outboard was first announced in Sept 2015, but I believe that was for pre-production testing.

The motor has some unique features, including dual counter rotation crank shafts to give balance to a 2 cylinder diesel and cut down the vibration. The torque is closer to a 90 hp 4 stroke gas engine--and fuel burn is very close to 1 gallon per 20 hp--so at lower speeds it is very fuel efficient.

Yanmar has made diesel outboards (27 and 36 HP) for some time--but they never passed EPA and CARB requirements. Nothing to say that they have been accepted in the USA yet--or will be.

They are heavy at 174 Kg (386#) vs about 97 Kg (214#) for the Honda 50 hp
gas outboard.

With the high torque--it is possible that a single 50 might be a good match for the C Dory 19 or 22 (Too heavy for the 16)

At 2500 RPM torque is 115 Newton Meters (85 ft-lbs), and a 70 hp outboard is about 80 newton Meters (59 ft-lbs) at 3500 and 87 Newton Meters at 5000 RPM (about what the Yanmar diesel is at 2000 RPM).

Could this plane a C Dory, with the right prop--I believe so. May be an interesting option down the line.
 
This is a development of the Neander motor, a double crank, single cylinder diesel. It was developed by an outfit in Neander, Germany. They've proposed it for motorcycles, outboards and who knows what. Prototypes have been made and run. Glad to see Yamaha is picking it up, don't understand why it wasn't done sooner.

Neander also brought you the Neanderthal man, a predecessor and ancestor of modern man.

Boris
 
All the company literature compares this 50 hp to a 70hp gas outboard. I do not know if this is because of similar performance due to higher torque or if they are playing number games to reduce the difference in weight?

I see this as a good work boat, skiff, or even slow house boat barge use. But for a cruising planning or fishing boat I think it still has a way to go. baby steps.
 
Hey guys,

Yanmar Marine was producing two diesel outboards in the 1980-90s. A 27 hp and a 48 hp. As I understand it there were a few sold up in Alaska. I was receiving information on a German design (Neander maybe?) which was going to be a lightweight turbo charged 50 hp outboard but haven't received anything from them in a few years.

I am familiar with Yanmar though, I had an 18 hp in my 1988 Hellgrammite built by Atlas Boat Works. A displacement hull with 7 knot cruising speed. The little Yanmar pushed it with power to spare at 1 quart an hour fuel consumption. I now have a gray market 1750D Yanmar tractor with basically the same engine as my Hellgrammite had and it too is surprisingly easy on fuel. Both were easy to maintain and very reliable. I've also used Yanmar air cooled, dewater/firefighting pumps with similar results.

Now everyone be good, take care and be safe
Spuncopper
 
This is not a Yanmar designed engine but is a German-designed Neander-Shark engine. It's been under development for years by Neander Motors in Kiel, Germany. Utterly unlike any engine having the Yanmar name before.

Certainly not a Yamaha, sorry for the misteak. I type poorly.

And, again, this the same place which brought you the Neanderthal, a predecessor to the home sapiens.

Boris
 
An expected 10,000 hour operating life: = twice normal for gas outboards in commercial use (approx.). Very Good!

Any cost figures suggested yet?

Price / fuel / maintenance / cost effective?

Joe :teeth :thup
 
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