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Old 22-07-2019, 09:48 PM   #1
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Engine cooling in vary salty water

Hello,

My newly acquired Bikini has a Ford Pinto 205 engine that is cooled sea to sea and has been fitted by a marine impeller pump. I am worried that the Red Sea water salinity is too harsh and will erode the motor.

I am considering reinstalling the water pump and running a closed cooling water through the engine and cool that with a heat exchanger that is cooled by the existing impeller pump that then cools the exhaust manifold.

Any suggestions or dos and donts would be greatly appreciated.

Thanks
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Old 23-07-2019, 10:18 AM   #2
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Country: In the UK, in an offfice, looking out the window at the rain.
Occupation: Chartered Engineer
Interests: boats, water, snow, football
Boat name: DoubleSix
Boat make: Ring 21c
Engines: Opti 200
Cruising area: Lyme Bay

Join Date: Aug 2012
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Quote:
Originally Posted by Faisal View Post
Hello,

My newly acquired Bikini has a Ford Pinto 205 engine that is cooled sea to sea and has been fitted by a marine impeller pump. I am worried that the Red Sea water salinity is too harsh and will erode the motor.

I am considering reinstalling the water pump and running a closed cooling water through the engine and cool that with a heat exchanger that is cooled by the existing impeller pump that then cools the exhaust manifold.

Any suggestions or dos and donts would be greatly appreciated.

Thanks
As long as the ultimate/final coolant is sea water then there will always be something in contact with it. In your suggested case the heat exchanger will be the contact point which can fairly easily be replaced as regular as you like, but you will still have the exhaust manifold and discharge to consider. As long as you get the protection right in these areas all should be well. Speak to a specialist in cathodic protection and fit sacrificial zinc anodes to the system, and replace them regularly. Also need to consider if the boat is to be kept in or out of the water.
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