Hi Otto,
Most boat engines injest water into the cooling passages of the engine, and pump it out. So, they are direct conduction cooled. No need for a heat exchanger at all, although bigger engines have a water to water heat exchanger. That is why an outboard motor can be so light-weight. Ever seen a radiator on a boat? Nope. Its just the engines down in the engine bay.
Last edited by donee; 08-09-2008 at 12:00 AM..
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