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Old 01-09-2008, 08:09 PM
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Default diesel outboard

Does anyone have any info on diesel outboards?
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Old 01-09-2008, 08:19 PM
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Default Re: diesel outboard

yanmar made a 27 hp, my buddy had one and then he sold it on craigslist for 500 or 600.
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Old 01-09-2008, 08:27 PM
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Default Re: diesel outboard

Yanmar still makes them IIRC but you can't buy them in the states. If your looking for a big diesel outboard look at this link:

http://www.megoutboard.com/index.html
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Old 01-09-2008, 08:44 PM
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Default Re: diesel outboard

While time will tell, I am hopefull that a good diesel outboard will be available similar to the MEG setup above. This could make
boating alot safer and hope the other manufacturers will put some reseach into this.




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Old 01-09-2008, 09:18 PM
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Default Re: diesel outboard

There used to be one advertised in Popular Mechanics back in the mid to late 70's. Not a kit, a ready to use one.

I think Honda or Tohatsu makes one now, but it is not available here in the U.S.

The military currently uses them.

Good luck!
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Old 01-09-2008, 09:23 PM
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Default Re: diesel outboard

8gph at rated power (similar to 300hp 4 stroke gas)!! That's awesome!
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Old 01-09-2008, 09:28 PM
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Default Re: diesel outboard

Yanmar and Yamaha have them available for third world countries. They are too heavy and too dirty for the U.S. consumer in near term technology development. You won't be seeing them here anytime soon, if ever.
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Old 01-09-2008, 09:35 PM
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Default Re: diesel outboard

Excellent, this looks promising. The fuel burn rate looks good also. Thanks for the info.
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Old 01-10-2008, 03:07 AM
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Default Re: diesel outboard

This outboard will run on diesel, gas or preferably JP8.


http://www.mercurygovsales.com/technology/optimaxjp.php

Here is a true diesel:

http://www.megoutboard.com/
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Old 01-10-2008, 06:30 AM
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Default Re: diesel outboard

That Mercury JP model is interesting. I wonder what EPA level it has with each fuel type?
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Old 01-10-2008, 07:47 AM
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Default Re: diesel outboard

Quote:
Trav4011 - 1/9/2008 9:23 PM

8gph at rated power (similar to 300hp 4 stroke gas)!! That's awesome!
I can throw a football similar to Tom Brady. Just not as far or as accurately.
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Old 01-10-2008, 08:33 AM
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Default Re: diesel outboard

This company is getting ready to release two turbo diesel outboards that are supposed to be in the 225HP and 300HP range. Only weighs 723 lbs. It looks like they use the Mercury lower unit. Should be interesting......

http://www.megoutboard.com
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Old 01-10-2008, 09:04 AM
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Default Re: diesel outboard

Quote:
285exp - 1/10/2008 7:47 AM

Quote:
Trav4011 - 1/9/2008 9:23 PM

8gph at rated power (similar to 300hp 4 stroke gas)!! That's awesome!
I can throw a football similar to Tom Brady. Just not as far or as accurately.
I don't see why a diesel outboard would be all that bad.. Honestly, diesel engines have a powerband that's very similar to a 2 stroke gas engine. LOTS of midrange TQ, which is what most boats need.. The diesel will probably make more low end TQ than a 2 stroke gas engine, but, that's not a bad thing. The diesel engine's powerband would fall off at around 4K rpm, but, with so much TQ, you could run a bigger prop, and achieve the same top end numbers as a larger gas counterpart. I believe that's why they say "similiar to a 300hp 4 stroke". It probably doesn't make 300hp, but, it should make around 500ft lbs of TQ. Horsepower really isn't the "end all".. TQ is what moves the boat, and determines what size prop you can run.
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Old 01-10-2008, 09:23 AM
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Default Re: diesel outboard

I think diesel outboards are a fine idea, but when the mfg starts quoting output as "similar to 300 hp 4S", that sets off the BS meter. Tell me what it actually makes. I suspect that the 160 or so hp that it really produces doesn't look so good in the brochure.
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Old 01-10-2008, 09:27 AM
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Default Re: diesel outboard

Quote:
285exp - 1/10/2008 12:23 PM

I think diesel outboards are a fine idea, but when the mfg starts quoting output as "similar to 300 hp 4S", that sets off the BS meter. Tell me what it actually makes. I suspect that the 160 or so hp that it really produces doesn't look so good in the brochure.
I agree. The problem is that the power delivery of a diesel is so much different than a gas engine. What I would like to see (and would help to sell them I'm sure) is for them to do side by side comparisons on some well known boats. I would suspect (hope) they will do this once the engines enter production. Otherwise, it'll be a hard sell.

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Old 01-10-2008, 10:37 AM
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Default Re: diesel outboard

Quote:
285exp - 1/10/2008 9:23 AM

I suspect that the 160 or so hp that it really produces doesn't look so good in the brochure.
That's where I would place my bet!

The hp rating would throw off alot of potential customers not familiar with diesel performance. Performance specs would be nice. And the engine manufacturer.

I am curious about the dry sump oil system. Not very common.



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Old 01-10-2008, 11:26 AM
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Default Re: diesel outboard

The TQ figures are far more important than horsepower.. "horsepower", is a bragging rights term..

Look at the difference between a 150hp 2 stroke and a 150hp 4 stroke, on the same hull. Which one planes faster? Which one accelerates faster? Both have roughly the same top end speed.. Why is this? The 2 stroke makes 50-70% more TQ under the curve than the 4 stroke engine.. Diesels are much the same, but, usually make even more TQ. Top end speed is set by prop pitch/diameter, and is affected by TQ output. Horsepower isn't really even a "measureable" term. Horsepower is just a number, derived from TQ and RPM..

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Old 01-10-2008, 11:36 AM
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Default Re: diesel outboard

Quote:
highland61 - 1/10/2008 1:37 PM

Quote:
285exp - 1/10/2008 9:23 AM

I suspect that the 160 or so hp that it really produces doesn't look so good in the brochure.
That's where I would place my bet!

The hp rating would throw off alot of potential customers not familiar with diesel performance. Performance specs would be nice. And the engine manufacturer.

I am curious about the dry sump oil system. Not very common.

.
Yeah, dry sumps are used to help make an engine more compact - that's probably why they use it. Its common on motorcycles and on snowmobiles that use 4 stroke engines.

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Old 01-10-2008, 12:31 PM
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Default Re: diesel outboard

Kchace,

Very familiar with dry sump systems, especially with air cooled motorcycles. Also, there are some hp benefits to most dry vs wet sump engines. Been around some "traditional" style diesels with dry sumps also, EMD's as one example.

I was curious if is this a one off engine, or is it a converted wet to dry sump engine. Probably not alot of info available to the public yet.

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Old 01-10-2008, 01:19 PM
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Default Re: diesel outboard

IF everyone had true tq stickers on their cowel instead of hp numbers on them , their would be no 2 & 4 stroke wars and I would bet most guys would be stickerless . tq is what makes everything move .
I used to love my big block chevys . now with 2 non stock dodges that produce 1k + ft lbs of toqure on dyno . or any other todays stock desiels for that matter their is no comparason .

Their is a reason their is no gas power logging trucks ! they just have to get over that weight issue for th outboard aplacation .
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2 stroke because 4 strokes are 2 to many and 1 is not enough

yes your suzuki has tons of toqure because its geared high enough to make a weed eater pull a house .!!!! Did you change your oil yet boy ???
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