New DIESEL outboard.

brian eiland · Jul 7, 2015

Mudcrab said: ↑

Just occurs to me you could do a crowd design right here. Set your specs and ask for suggestions.
Cheers
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If you want to do a 'design effort/exercise' then I might suggest a whole new subject thread devoted to that effort, and you can always link back to this thread that is about primarily OXE and its belt drive technology.

Mr Efficiency · Jul 7, 2015

Good idea Brian.

brian eiland · Jul 7, 2015

Interesting posting by a very knowledgeable fellow over on another forum:
http://www.yachtforums.com/threads/new-diesel-outboard.24899/#post-218105 ...with photo attachments

HTM09 said:

I am most probably the biggest fan of diesel outboard engines on this forum. And this for commercial shipping and for private boating!

But......

There are NO really usable diesel outboards on the market yet. The old Yanmar 35 HP diesel outboard was a very reliable engine with low fuel consumption but heavy and vibrating like hell. But with todays diesel technology, like injection systems (high pressure common rail) and noise / vibration lowering measurements, it would still be a good outboard engine. The only problem would be the high purchase costs. Far to expensive for a mass production leisure boatintg product. The one we had on my fathers yawl was sunk by my brother including the gig he was bolted on .

The German app. 70 HP turbo diesel outboard engine (Neander Shark) is far to heavy (155 kg) for private use and even more expensive. I am trying to buy a descent number of those engines from them (for our SOLAS RESCUE BOATS) for several years now but there is no evidence of any type of production yet.

These Chinese diesel outboards, which are sold through an Australian company in Europe are of lousy quality and performance, very noisy, unreliable and do not have any type of dealer or service network in Europe or in the US. We have tested two of them. The result of our specialists was there request to sink them in the deep open sea .

This new swedish diesel outboard engine is a new and totally different approach. Using a GM production 2 litre car engine, mount it horizontally and transmit the power via belt drives to the prop is an interesting idea. Modern normal and toothed belts can transmit pretty high amounts of power but their lifetime is rather limited.

I have two pretty big 24 Volt DC alternators each on my Volvo Penta D4-180 engines in my 50 ft inland waterway displacement boat. They work flawless for one season, may be for one an a half but around the belt drives in front of the engines, there is always a lot of black abrasion material located. Means, high torque transmission causes abrasion on belts. Plus those belts get pretty warm and that causes embrittlement.

The other and biggest problem on belt drives are constant and propper belt tension and belt oscillations especially on longer belts. On my powered glider with its 50 HP Wankel engine and its very long belt drive, it needs a lot of attention.

In my opinion, a turbo diesel Wankel engine or a OPOC double piston two stroke turbo diesel would be the optimum outboard diesel engine for leisure boating. Light, small, powerfull and both could be mounted vertically for a less problematic shaft drive.

Just my 2 (Euro) Cents
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Angélique · Jul 7, 2015

Mudcrab said: ↑

Just occurs to me you could do a crowd design right here. Set your specs and ask for suggestions.
Click to expand...

brian eiland said: ↑

If you want to do a 'design effort/exercise' then I might suggest a whole new subject thread devoted to that effort, and you can always link back to this thread that is about primarily OXE and its belt drive technology.
Click to expand...

Who wants to can start a "split off thread" and quote in post #1 all the relevant posts, or the relevant parts out of it, that one wants to take along to the new thread, like I did here.

brian eiland · Jul 10, 2015

OPOC Diesel Engine possibilities

brian eiland said: ↑

Interesting posting by a very knowledgeable fellow over on another forum:
http://www.yachtforums.com/threads/new-diesel-outboard.24899/#post-218105 ...with photo attachments.
"In my opinion, a turbo diesel Wankel engine or a OPOC double piston two stroke turbo diesel would be the optimum outboard diesel engine for leisure boating. Light, small, powerfull"
Click to expand...

Interesting new OPOC diesel engine subject brought up by the same contributor
http://www.yachtforums.com/threads/new-diesel-outboard.24899/#post-218278
http://www.ecomotors.com/ click on engine image on opening page of their website for a motion animation

ChrisN67 · Oct 7, 2015

Conversion of Outboard to Inboard Deisel

I converted an Intrepid 339 twin outboard to diesel inboard with surface drive. Its a pretty straight forward build, just need to be accurate on geometry and use resilient construction methods (i.e. Epoxy, Biax, vacuum bagging).

It went from: 33.9' to 38.5'
Twin 200's to twin Yanmar 6LY2 tuned and dyno'd to 454 hp.
Two speed gear and surface drive with Rolla Props
44 Knots first gear, 52 Knots WOT second gear

https://www.youtube.com/watch?v=E4l4ATbv-Eg

brian eiland · Oct 7, 2015

Interesting, .....bet that wasn't a cheap conversion !

I have a friend with a boat with a similar power train.

whitepointer23 · Oct 7, 2015

brian eiland said: ↑

Interesting new OPOC diesel engine subject brought up by the same contributor
http://www.yachtforums.com/threads/new-diesel-outboard.24899/#post-218278
http://www.ecomotors.com/ click on engine image on opening page of their website for a motion animation
Click to expand...

What makes this engine any better than the commer knocker thats been around for decades. This looks like the same idea to me.

powerabout · Oct 7, 2015

that design has lots of advantages and there are other engines out there under development as well

New DIESEL outboard.

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Angélique aka Angel (only by name)

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