Is closed cooling system the same as freshwater cooling system?

[Captain Jimbo]

I have a new MerCruiser Plus 357 bravo 4V engine on my boat and they installed a closed cooling system with heat exchanger. My question is is that the same thing as a freshwater cooling system?

 

[scoflaw]

"closed" is a better term. "raw water"is sometimes used with an open system

 

[Lazy Daze]

Generally speaking, yes. Although "freshwater cooling" is really an incorrect term to use since antifreeze is being used in the engine, not water. But, yes. The better terms are "closed" and "open".

 

[Henry Boyd]

And to furthure confuse the story, both closed and raw water cooling use the water the boat is floating in for cooling. The closed cooling engines use ocean/lake/pond/river/stream (OLPRS) water to cool not only the heat exchanger, but also to cool exhaust and intake (?) manifolds. The raw water cooled boats use OLPRS for everything.

 

[Captain Jimbo]

And to furthure confuse the story, both closed and raw water cooling use the water the boat is floating in for cooling. The closed cooling engines use ocean/lake/pond/river/stream (OLPRS) water to cool not only the heat exchanger, but also to cool exhaust and intake (?) manifolds. The raw water cooled boats use OLPRS for everything.

Thanks , you guys all helped me sell my boat !