Most marine diesels are closed circuit cooled, just like a car, but instead of a radiator they use a heat exchanger and raw water (sea water) to cool the coolant. Most V8s use raw water cooling, the sea water (fresh if on a lake) runs straight around the engine.
Not too sure why the petrols don't use closed circuit cooling. There may be some modern motors that do or a reason why they don't. I'm sure someone on here will know more.
Its an option on both but since the diesels run hotter then the gassers it is better to have closed cooling on the diesels, on a gasser it would be better too, but robs power in both cases and ads weight which on a diesel it realy doesent matter that much.
Thast what i heard and know ...MAYBE WRONG ??!!!
But makes the most sense.
__________________ Not as bad as you think i am, just different !
thank you for your replys
thats why i like forums like these
my mate is marinising cummins truck engine 5.9 for fresh water use
he was thinking of raw water cooling rather than the closed system
what are the pros an cons and how is it usually done
I know that the 8.3 C series suffers from liner cavitation so the coolent filter needs to be changed regularly and inhibiter used. don't know if it's the same for the 5.9 B series
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