An open-loop cooling system ... the type of engine, and your budget. If you're running a boat on a freshwater lake and want to keep things simple, an open-loop system might be fine.

A marine engine’s cooling system consists of two basic components. The raw-water system draws in seawater through an open seacock via an in-line pump. The seawater goes through a lube oil cooler and ...

An open-loop cooling system ... But if you boat in saltwater, or own anything with decent horsepower, a closed-loop system is the smarter long-term choice. It shields the engine from corrosion ...