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Old 05-19-2015, 08:52 PM   #1
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Mercury Diesel Outboard

OptiMax Diesel – Reporting for Duty! | Mercury Racing
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Old 05-19-2015, 09:31 PM   #2
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Would that push a trawler?
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Old 05-19-2015, 11:02 PM   #3
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That direct injected, spark ignited, non throttled intake, low compression engine is in thermodynamic terms a meld of the Otto and Diesel cycles. Closer to Otto, really, as the high compression of the diesel cycle has much to do with its efficiency.

I'd like to see the dyno lab reports, but doubt that stuff will leak out. Gut feel is BSFC is comparable to a regular optimax, maybe a touch better.

The big deal is they wanted an OB that burned diesel and jet fuel, they don't want gasoline on ships any more. Too many bad fires.
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Old 05-19-2015, 11:06 PM   #4
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That direct injected, spark ignited, non throttled intake, low compression engine is in thermodynamic terms a meld of the Otto and Diesel cycles. Closer to Otto, really, as the high compression of the diesel cycle has much to do with its efficiency.

I'd like to see the dyno lab reports, but doubt that stuff will leak out. Gut feel is BSFC is comparable to a regular optimax, maybe a touch better.

The big deal is they wanted an OB that burned diesel and jet fuel, they don't want gasoline on ships any more. Too many bad fires.

Ok the first two pieces of text I have no idea what you said (words to big for me). I did Get the last part, gasoline is too combustible to be on navy ships. I can definelty agree with that.
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Old 05-19-2015, 11:29 PM   #5
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I personally wouldn't want a diesel OB any more than I'd want a diesel car.
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Old 05-19-2015, 11:31 PM   #6
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I would not like a diesel OB. But I do like my diesel car!!
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Old 05-19-2015, 11:37 PM   #7
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I would not like a diesel OB. But I do like my diesel car!!
+1. On my first diesel car, and I like it too. Only prior experience,2 diesel rental cars.
A hybrid diesel OB sounds weird.
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Old 05-20-2015, 12:02 AM   #8
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I have often wondered why someone has not produced a diesel outboard. Might be nice to have 15 horse that you could take off the dink and use as a get home motor. They make small diesels now for quads, why not outboards?

I don't care for the idea of a converted gas engine. GM did that in the 80s and pretty much ruined the diesel car market.
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Old 05-20-2015, 12:19 AM   #9
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I personally wouldn't want a diesel OB any more than I'd want a diesel car.
Curious, why?

Efficient, safer, and of course probably not this one any more than the new truck diesels, but older diesels can be operated on alternative fuel sources. Lot of pluses for diesel.
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Old 05-20-2015, 03:41 AM   #10
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Umm, a good get home motor.
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Old 05-20-2015, 03:44 AM   #11
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This most be the same

OXE - DIESEL OUTBOARD
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Old 05-20-2015, 04:27 AM   #12
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I personally wouldn't want a diesel OB any more than I'd want a diesel car.
OOI, have you driven a modern diesel? I wouldn't have another petrol engined daily driver.
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Old 05-20-2015, 06:33 AM   #13
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The driver is the military who wants to cut down on the supply hassle of multiple fuels in the field.

UAV, drones , are the first consideration , which is good as weight is a dirty word.

The use of spark ignition reduces the loads enough so gas engine construction , and weights can be had.

IF the air police can be satisfied spark ignition and diesel will be in competition for the daily driver.

The use of lighter OR heavier fuel than diesel means there might be some price competition.
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Old 05-20-2015, 06:39 AM   #14
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I have often wondered why someone has not produced a diesel outboard. Might be nice to have 15 horse that you could take off the dink and use as a get home motor. They make small diesels now for quads, why not outboards?

I don't care for the idea of a converted gas engine. GM did that in the 80s and pretty much ruined the diesel car market.
There have been a few around for many years.

Yanmar was one...but excruciatingly heavy for the hp.
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Old 05-20-2015, 09:25 AM   #15
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I personally wouldn't want a diesel OB any more than I'd want a diesel car.
Use your imagination.....all the advantages of having one, safe, available anywhere, fuel on board. Not to mention that with a simple plumbing job, connected to your diesel tank, you have a possible "get home" power source with (almost) an inexhaustible supply of fuel. How about a "diesel station" on your boat for feeding the dinghy? No, the advantages of a diesel OB are many.
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Old 05-20-2015, 09:42 AM   #16
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If we ever get a bigger boat the dinghy will have one, since it uses the same fuel as he mothership that'll be great! No more carrying gas around.
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Old 05-20-2015, 10:31 AM   #17
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Carrying gas is a PITA, no doubt. But a diesel outboard is going to be HEAVY and LOUD. Unless they can do some magic to fix those two issues, I'll put up with a gasser dink.
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Old 05-20-2015, 10:52 AM   #18
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Re the diesel car;

I drove a 2012 Jetta diesel automatic for a day as a loaner car. Amazing car and a lot of the diesel negs were almost gone. But there you have it in the word "almost". Never imagined a diesel would be that fast and quiet. But the gas car was quieter and more powerful. I later bought a Jetta turbo gas. It got almost the millage of the diesel and was better in all other respects. There's no point in buying a diesel unless it's actually better. Kinda like the Prius .. not cost effective.

Got tired of the harsh ride, noise, lack of space inside and even shifting the stick shift. Traded the Jetta in on a very comfortable Honda Accord w the CVT transmission. Seamless power even if a little less than the Jetta. Without having to orchestrate the road speed/engine speed and shifting I'm free to just drive w both hands on the helm and as a result drive even faster all the time instead of just when I "get on it". And the details like a bit of friction added so when opening the door it dosn't spring back at you. It's a superior car IMO.
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Old 05-20-2015, 11:37 AM   #19
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I like diesels for heavy work load applications such as towing or heavy equipment. I've been very impressed with fords Eco boost. Dad has a expedition with the 3.5 liter twin turbo Tons of power.

Here's an application where i prefer the diesel power.
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Old 05-20-2015, 11:59 AM   #20
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Either of those two vehicles diesels Oliver?

My little blue car has a slipping clutch so not much power but more than an air cooled VW .. I think. The Honda has plenty of power. 180hp I think.

Re the thread a 4 stroke gas OB is too heavy so a diesel would be unthinkable. The Yanmar OB was ridiculously heavy and noisy. Very expensive too.
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