That 470 has a small exchanger or a big one. My 470 has the larger exchanger
and runs very cool.
KH

wrote in message
...
Paul Schilter paulschilter@comcast,dot,net wrote:
: Since external water used in cooling engines causes a lot of problems,
why
: hasn't a car type radiator system with fan ever been used?
: Paul

Your "argument by incorrect assertion" is untrue regarding "external
water used in cooling engines causes a lot of problems".

As others have mentioned, boats use heat exchangers vs. radiators.
What are ya gonna do? Have a fan behind the radiator mounted on the
front of the boat (think how silly that would look) to cool the
radiator at idle speed?

FWIW, my father had a MercCruiser 470 with a heat exchanger. He had
nothing but trouble with it (overheating). I have an old OMC V-6 without
a heat exchanger and have had zero problems with the cooling system
since 1982. There's plentful cool water in the lake for cooling an
engine.
Not using it doesn't make much sense (unless the boat is run in a salt
water environment).

b.