Intercooler boat engines
How Intercooler Boat Engines Work
Today the vast majority of boat engines are intercooler or cooled by an internal fresh water supply.
In an intercooled engine, the role of the seawater is to remove heat from the fresh water. The seawater, or "raw water", is a separate stream to the fresh water and never comes into contact with the engine. It doesn't actually come into contact with the fresh water either, but comes very close to the heat exchanger or "intercooler", which is enclosed in an expansion tank.
The heat exchanger is a stack of thermally conductive tubes immersed in an outer casing containing fresh water coolant. The fresh water, which is mixed with antifreeze, is pumped around the engine, removing heat from the moving parts. When it reaches the heat exchanger, it is cooled by the constantly renewed seawater and then returns to the engine block to continue its work.
The now-warm seawater, on the other hand, is pumped into the exhaust system and used to cool the exhaust gases as they exit. This is why we check for water in the exhaust, and it also explains why you can hear the "bloop, bloop, whoop" noise of a passing boat. What happens is that the sea water builds up in the muffler and the exhaust pressure picks it up and blows it out.
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