Rank: Dedicated Tin Star
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Joined: 9/11/2008
Posts: 99
Points: 109
Location: mebane,nc
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well put in the starboard engine today its together now for the cooling.i was going to use the fresh water system .but i will have plug the 1" bypass on the thermostat housing .or if i go back raw water i will have to change the rear manifold gaskets and find the tee for the bypass hose .i know fresh water cooling is a big plus in salt water but how much benifit is it in fresh water..and the other motor is raw water any way..any thoughts???
tim
72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
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Rank: Top Rank Aluminum Star
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Joined: 12/7/2007
Posts: 394
Points: 726
Location: Central Florida and the DC area
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This is a topic for Jeff, but I would think that fresh water cooling would be worthwhile even in a lake or river.
Antifreeze is a better coolant than water and has additives that retard corrosion in the block and lubricate the circulating pump.
Using a pressurized system lets you run at the higher temperature that the engine was designed for.
The engine is much more tolerant of interruptions in the cooling water since the coolant in the block has to boil before the engine is ruined.
Stuff sucked up from the river can only plug up the heat exchanger, not fill up the block with silt. Your intake filters are supposed to handle this, but......
You are already winterized.
On the down side, you need a saltwater pump and a heat exchanger. Cheap considering the benefits.
"I remember when welfare was for poor people..."
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Rank: Top Rank Aluminum Star
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Joined: 12/5/2007
Posts: 980
Points: 1,790
Location: New Tripoli, PA
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Everyone of Doug's points is correct, but the plugging factor is actually worse with FWCooling--heat exchangers plug up with crud easier than the block. Fuel economy has got to be better with FWC since, as Doug stated, since you can run the motor hotter. To get maximum fuel economy, modern cars run 30 to 40 degrees hotter than even FWC motors, and they run 20 degrees hotter than RWC.
A major, hidden advantage with FWC is the "Fastjeff Overheating Time Factor". Loose the raw water input (thrown belt, impeller failure, hose breaks, intake blocked by a rag, etc.) and the motor overheats. (Doh!) With FWC, however, you have several minutes of grace time before the temperature spikes; and when it does, you merely start blowing coolant out the radiator cap. With RWCooling, however, the block runs dry immediately and the motor will destroy itself in 30 seconds. (Ask me how I know. Better yet, please don't. I'm still getting over it.)
Finally, exhaust manifolds can be included in the FWC coolant circuit, which extends their life in salt water dramatically. (In fresh water this is not as relevant since they still rot out from the exhaust side.)
The advantage of RWCooling is simplicity--period.
Jeff
I'm STILL waiting for my bailout!
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