Yanmar Diesel Outboards

[mikewilkes]

Hello, its the first time I have posted on mobo.
Got some info on the above from Talbot but wondered if anybody on this side of the fence has any experience of them. Talbot has been running his for donkey's and seems to have no trouble.
Any comments on reliability or consumption would be greatly recieved.
Mike

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[longjohnsilver]

No personal experience, but they are used on the water taxis in Alderney so I would guess they consider them to be both reliable and economical.

And welcome to the civilized forum ;-))

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[mikewilkes]

Dont tell anybody on the other side but am contemplating cutting that big tube off about 5' above the deck and using it as a chimney for a wood burner.
Get rid of those bits of rag and turn her into a power cat!!!

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[Talbot]

If you seriously want to go power, then the larger outboard is a better bet. This is nominally 36hp, but Barrus will be able to tweak it up to 45hp. In tests on ribs, a twin installation equated to twin 55hp when the rib was empty, however, when the rib was loaded up, the twin 45hp diesels were the equivalent of twin 75hp petrols! /forums/images/icons/smile.gif

The water taxi in Bembridge runs a diesel outboard (cant rememnber which one)
There are a number being used by fish farmers in scotland, and they have put serious hours on them.

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[Tomsk]

Any idea what the smallest diesel OB is? Are there any around 10hp?

<hr width=100% size=1>Tomsk -

Can I leave the planet please.. this one is broken!

 

[KevB]

Yes, you're right. There is one in Bembridge, Tihatsu I think. Bloody noisy......

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[Talbot]

Apart from the two Yanma engines (27 and 35hp), the next most common that I know off is the <A target="_blank" HREF=http://boatdiesel.com/index.cfm?S=DM&Manu=RUGGERINI>Ruggerini 15hp</A> They also do a 20hp and a 25hp. I know nothing about these engines.

There was a coventry climax engine of abt 25hp

I have just found a <A target="_blank" HREF=http://www.chinadiesel.com/mrn/diesel_outboard.htm>cheap 4 hp</A>

Zongshen make a 6hp and a 10hp. They are cheap, but dont look very robust!

and for the seriously interested, here is a reference that you cant possibly do with out : <font color=blue>Government of Western Samoa. 1988. Testing of diesel outboard engines for the Alia small boat fishery in Western Samoa. Fishery Division, Government of Western Samoa 20th Regional Technical Meeting on Fisheries. Ref. 20/ WP.35. South Pacific Commission</font color=blue>



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[longjohnsilver]

Cheap 4 hp

Cor, just the thing for my inflatable, all 93kgs of it!! ;-))

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[Talbot]

Re: Cheap 4 hp

be all right if you fill the inflatable with helium!


I said it was cheap, not that it was any good!

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[hansreuchlin]

Where have you seen this information regarding the tests on ribs??
I am putting together a Caribe DL15 rib(24 gls tank), and am seriously considering the D36(tweaked, and with sharper propangle).
If the promise of 75hp(under load) is true, than this should give me a about 300Nm range at 40 knots, which comes in handy in the Carib.
The engine is no longer imported in the US, so I might as well buy it from Barrus.
Please advise.

 

[corncob]

There was no 45hp diesel outboard 27hp or 36hp. I have heard that Yanmar will only build to order at a cost? UK MOD are using them along with fish farms, expect to see a few of those floating around?

The Yanmar was built specificly, they did not use an existing inboard engine and mount it on an outboard, like some? Built to last

Nonobaddog, I doubt you will see 40 knots they were designed for hard work at slow speed, only rev to 4500 funny gear reduction? You would be better with a 4-stroke outboard?

 

[hansreuchlin]

B36,
Don't you think that with a sufficiently sharp prop-angle you could push a 500 lbs RIB along at say 35 knots and 3000rpm?
Fuel economy is what I am after.

 

[corncob]

nonobaddog, 500lb RIB sure its not 5000lb?
The D36 has a selection of Yanmar props diameter is 11.5" with pitches starting at 9.0" to 14 or 15" I think you could swing a larger diameter if not increase pitch, but you would have to source alternative props? the gear ratio is 1.846:1, and depends what shaft length you choose, standard is long shaft, long long shaft or ultra long shaft? weight is approx 270kg? i think if boat weight is correct 20-25mph? I would run this info through a prop calculator though.

 

[jfm]

I think the ludicrous weights of diesel outboards makes them useless most of the time. also I heard the Yanmar 27hp cost about £10k, erk, though not checked first hand. You could buy a 4 stroke petrol, and a lot of petrol, and a couple of chartplotters for that