I would give it a try. Sounds like it could simplify the cooling system.


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GT-
This sounds like a cool set up. However I was thinking of my next jet boat, if and when I ever get one was to build a complete closed cooling system for it and use a heat exhchanger for the raw water coming in to act as the radiator, similar to mercuriser closed set ups. However I am interested in your set up. You might want to design it in kit form where the end user would have to finish "fabricating" the unit. I am up for that as well.
T.J.

Closed systems are my specialty.  I have built and installed dozens of systems from inboards,  to jets.

The one thing needing to be installed is a block mounted, automotive style water pump and honestly, if you install that,  use an I/O style thermostat kit and you're mostly there.

I will try to get something tangible together in the next month or so full size and try to put a video together to show what it can do.

Thanks for the insight.

If you need a heat exchanger,  let me know. I may even have one already built.

I will need to know approximate horsepower and what is needing to be cooled  (water, oil,  exhaust, v-drive box,  etc.).

GT

I talked to my friends at Meziere Enterprises about this when we had our last Comp Jet motor built.
They build both block mount and remote water pumps.
They couldn't understand why we didn't have a closed system.
And then you and I went back and forth a couple times about a system.

https://www.meziere.com/

I talked to my friends at Meziere Enterprises about this when we had our last Comp Jet motor built.
They build both block mount and remote water pumps.
They couldn't understand why we didn't have a closed system.
And then you and I went back and forth a couple times about a system.

https://www.meziere.com/

The bullshit reason I always got was weight.

I can do it for less than 50 pounds. Never understood it either Ron.

They were ready to take an aluminum radiator wrap it in a aluminum case.
Run raw water around it, coolant through it, a thermostat and one of their remote pumps and see what it would do.
Obviously some calculations would be made first.

I build copper shell and tube heat exchangers. Stupid efficient and very small. The heaviest element is the water.

GT

So GT, is this really only about another plan for a closed cooling system using a heat exchanger ? Looked back at you second post and saw "heat exchanger". 

Not really.

What I did is make a small heat exchanger to control the inlet water temperature. It's about half the size of a full on closed cooling deal.

It gets heated by the leaving water from the engine,  I'm thinking of putting the oil cooler in there as well.

Uses a thermostatic element to push a double headed valve against a travel limiter and a spring.

I think it's going to be pretty awesome.

Could be wrong.

GT