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PostPosted: 14 Feb 2013, 23:10 
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Joined: 15 Sep 2011, 08:48
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Location: South Carolina (redneck riviera)
....for outboard motors?

Watching gator hunters on TV tonight, I thought to myself "how the hell do they not burn those engines up in all that mud, and hydrilla, etc? You just know those water pumps are ingesting all that crap, and they have to keep shutting down and clearing it, the same way I have to do when I get into mud and sand out here."

And then it hit me. Why not design an outboard with a closed loop cooling system?

Have an electric water pump that runs when the ignition circuit of the engine is running, this would supply coolant to the cylinder head, and then back to the reservoir.

Then have a reservoir (not sure how big it would have to be) to hold the coolant.

And then a heat exchanger plate, or radiator. The heat exchanger could be mounted on the transom, flush with the bottom of the hull, so that water passing across the surface would help cool it down. Or, a radiator, mounted somewhere at the stern, that would be cooled by airflow.

Of course, the cooling system of the cylinder head would have to be re-designed, from a total loss system, to a closed-loop system, meaning, none of the coolant is lost through exhaust or other passages, 100% of it is returned to the reservoir.

But think how great this would be for people who operate in the swamps, or in sand and mud!!


Anyhow, this was one of those ideas that just popped into my head. I was curious if anyone had ever tried anything like this. If so, did it work as expected?



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PostPosted: 14 Feb 2013, 23:14 

Joined: 04 Dec 2010, 12:43
Posts: 166
wouldnt that be the same as a mud motor or surface drive motor lol.. good idea though


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PostPosted: 15 Feb 2013, 00:54 
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T-MAN wrote:
wouldnt that be the same as a mud motor or surface drive motor lol.. good idea though



Yeah, those go-devils are air-cooled engines, so, it would be the same kind of concept, but it would still be a conventional OBM lower unit, instead of surface drive.



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PostPosted: 15 Feb 2013, 12:38 
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Joined: 18 Jan 2012, 14:40
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Location: St. Petersburg, Fl
Good idea......hmmm how bout a hovercraft......the military has some pretty interesting closed systems, however you would have to pay $10,000 for the bolts that put it together, and the need to know. :?



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PostPosted: 15 Feb 2013, 13:02 

Joined: 08 Feb 2013, 16:26
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Location: Galveston County , Texas
This is strange !! I just logged on and I was thinking the same thing this morning. It would be awesome.



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PostPosted: 15 Feb 2013, 14:41 
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Heh....might be practical in some applications....overall I would say it inst though.



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PostPosted: 15 Feb 2013, 15:50 

Joined: 19 Jan 2012, 07:44
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Location: Northeast Arkansas
RiverBottomOutdoors wrote:
Heh....might be practical in some applications....overall I would say it inst though.

I agree, if you wanted to go with a radiator you'd have to mount a fan to cool it, and a pump to circulate the water. Thats going add more electrical requirements. And by the time you give up space to mount a radiator, hoses, pumps, you've given up a good deal of space. Then look what happens when you want to move the motor to another boat. Do you move all the associated cooling with the motor. That takes away the portability. If you decide to upgrade to a larger motor you'd need to increase the cooling capacity for the larger motor. Lots of things to take in to consideration and would only be practical for very specific applications.



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PostPosted: 16 Feb 2013, 10:29 
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Ha! Someone did it!

http://www.youtube.com/watch?v=nZSxKJZZTHc



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PostPosted: 16 Feb 2013, 12:06 
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Location: Cooper City Florida.
It might be worth it. Not just for that application but I like the idea of not having saltwater or high salinity water running through my aluminum block and heads. For us guys in salt water we flush and flush and flush but there’s always going to be some internal corrosion.

I saw the video and it’s obviously doable. I would like to know more about their system. I called and left a message. One of the guys is right down hers in south Florida close to me. I don’t think they will tell me much; I’m sure it’s proprietary.

A small mechanical or electrical water pump, a small radiator mounted up high enough to let the oncoming air dissipate the heat when running. A small fan or two mounted to a shroud in front of the radiator. A coolant temp switch/thermistor on the head to close the relay on the fan circuit so they will kick on when idling around, or when there wasn’t enough air coming across the radiator when running. I think that would work. :D



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PostPosted: 16 Feb 2013, 23:22 
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I saw that video, looks like the closed loop system was working perfectly for that particular application!

So, obviously, it CAN be done, and has been done. Now the question is, how hard is it to make this modification?

I'm still thinking a heat exchanger plate mounted to the transom would act as efficiently as a radiator, in fact, this is how the closed loop PWC's from Sea Doo circulate the coolant.

As far as all the added things that a closed loop system requires....I'm not too worried about having to unbolt and swap engines, etc.....once I put an engine on a boat, that's where it stays, until it dies, or I get rid of the boat, whichever comes first!



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PostPosted: 16 Feb 2013, 23:24 
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bigwave wrote:
Good idea......hmmm how bout a hovercraft......the military has some pretty interesting closed systems, however you would have to pay $10,000 for the bolts that put it together, and the need to know. :?


Hovercraft is cool, but I still like my idea of the flat-bottom boat with the snowmobile track, for propulsion across water, and across sandbars. :mrgreen:

Sometimes I think maybe I SHOULD have gone to college, maybe I'd be working for a think tank somewhere, making a helluva lot more than what I make.



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PostPosted: 18 Feb 2013, 10:04 
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Joined: 18 Jan 2012, 14:40
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Hovercraft is cool, but I still like my idea of the flat-bottom boat with the snowmobile track, for propulsion across water, and across sandbars. :mrgreen:

Now were talking. :LOL2:



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PostPosted: 18 Feb 2013, 14:57 
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bigwave wrote:
Hovercraft is cool, but I still like my idea of the flat-bottom boat with the snowmobile track, for propulsion across water, and across sandbars. :mrgreen:

Now were talking. :LOL2:


Damn right. Unfortunately, I live on the coast of South Carolina....we don't have any surplus snowmobiles sitting around here for me to buy one and start experimenting.

I'm hoping someone who lives in an area where surplus snowmobiles can be found, will try such a project and let us know how it works out.



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