[Question] Cooling system
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Cooling system

  1. #1
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    Default Cooling system

    Ok so I have been racking my brain over this for some time now and wanted to get some input. I am a gear head, not new to boating or jets, but new to v8 jets. I am trying to get why you cant use a radiator. I have read arguments that state "no air flow to cool the radiator" or "exhaust will heat up the radiator"

    So I can understand some of this logic if your motor is indeed enclosed. If you have an open engine design then why wouldnt you be able to slap a radiator on the front of the engine or even on the side of the engine with a fan on it.

    I wonder this because i want to use my boat in salt water, and a radiator would help me avoid corrosion and extra steps to avoid said corrosion. i know there are closed loop systems available, but most if not all do not recommended to use in salt water.

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    Boats use a water to water heat exchanger instead of a radiator. They are called fresh water cooling systems. Always a good idea for us salty dawgs.

    Sent from my SM-P900 using Tapatalk

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    Quote Originally Posted by oldseddie View Post
    Boats use a water to water heat exchanger instead of a radiator. They are called fresh water cooling systems. Always a good idea for us salty dawgs.

    Sent from my SM-P900 using Tapatalk
    Thanks. I was just researching air to water exhangers, didnt think about a water to water. Marine Closed Cooling Systems ?
    Last edited by snake_charmer; 05-04-2016 at 02:07 PM.

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    Quote Originally Posted by snake_charmer View Post
    Ok so I have been racking my brain over this for some time now and wanted to get some input. I am a gear head, not new to boating or jets, but new to v8 jets. I am trying to get why you cant use a radiator. I have read arguments that state "no air flow to cool the radiator" or "exhaust will heat up the radiator"

    So I can understand some of this logic if your motor is indeed enclosed. If you have an open engine design then why wouldnt you be able to slap a radiator on the front of the engine or even on the side of the engine with a fan on it.

    I wonder this because i want to use my boat in salt water, and a radiator would help me avoid corrosion and extra steps to avoid said corrosion. i know there are closed loop systems available, but most if not all do not recommended to use in salt water.
    Are you talking day cruiser or 18' rocket? How many seats do you need? Over transom headers or TT logs? Performance level expected from planned engine?

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    Quote Originally Posted by uniboarder View Post
    Are you talking day cruiser or 18' rocket? How many seats do you need? Over transom headers or TT logs? Performance level expected from planned engine?
    Well i have 2 boats that I am looking at purchasing. One is an 18ft bow rider with a 460 ford and TT logs. the other is a rocket with a 454 chevy and over transom headers. I am not planning on turning either into top performance racing. what ever hp and pump performance i have I will not try to change with power modifiers.

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    Quote Originally Posted by snake_charmer View Post
    Ok so I have been racking my brain over this for some time now and wanted to get some input. I am a gear head, not new to boating or jets, but new to v8 jets. I am trying to get why you cant use a radiator. I have read arguments that state "no air flow to cool the radiator" or "exhaust will heat up the radiator"

    So I can understand some of this logic if your motor is indeed enclosed. If you have an open engine design then why wouldnt you be able to slap a radiator on the front of the engine or even on the side of the engine with a fan on it.

    I wonder this because i want to use my boat in salt water, and a radiator would help me avoid corrosion and extra steps to avoid said corrosion. i know there are closed loop systems available, but most if not all do not recommended to use in salt water.
    There no reason why an internal combustion liquid cooled engine couldn't be set up with a radiator and fan setup in a watercraft like any other motor vehicle that I could see beyond pure "esthetics" and maybe cockpit/engine bay space availability ...However Im not sure why one would really desire that type arrangement , given the modern raw water heat exchangers that are available for fresh, salt and brackish water it just doesn't seem practical to consider a radiator in a jet boat

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    Quote Originally Posted by snake_charmer View Post
    Ok so I have been racking my brain over this for some time now and wanted to get some input. I am a gear head, not new to boating or jets, but new to v8 jets. I am trying to get why you cant use a radiator. I have read arguments that state "no air flow to cool the radiator" or "exhaust will heat up the radiator"

    So I can understand some of this logic if your motor is indeed enclosed. If you have an open engine design then why wouldnt you be able to slap a radiator on the front of the engine or even on the side of the engine with a fan on it.

    I wonder this because i want to use my boat in salt water, and a radiator would help me avoid corrosion and extra steps to avoid said corrosion. i know there are closed loop systems available, but most if not all do not recommended to use in salt water.
    My Dad actually tried this about 40 years ago. We had just replaced the engine because salt water had eaten a hole into the crankcase. We had a 21 ft open boat with an early Berkeley jet and a 322 cui Buick. Dad wanted to protect the new engine from the salt, but couldn't justify the expense of the freshwater cooling system. We mounted the original radiator from the car the engine came from. We speculated the air flow into the open boat would work just like riding down the highway. We got out on the water the first time and everything was fine while we idled from dock and checked over the engine on it's first voyage. As soon as we tried to put her on plane it overheated immediately. After thinking this through we came to the conclusion that the fan could not draw near enough air through the radiator. Plus the interior of the boat, though open, did not experience the air velocity resulting from the forward motion of the boat.

    Bottom line, it would take a lot of change to the boat and a huge radiator to make it work. Not worth the effort.

    Doug

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    After reading posts from other salt water guys (Long Beach, CA and Chad in Hawaii) I guess is to be prepared for the maintenance. Zinc anodes and flush the hell out of the motor after the days run. If you go OT I would just get them ceramic coated and run them dry. (unless you can afford stainless) Simple is the reason for a jet boat, spark and fuel=go fast have fun. I have watched a lot of guys bypass all of their fancy bolted on bilge sores to get a hour on the water.

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    I run my jet in salt water. I useb magnesium anodes as I have an aluminum hull but it is a good idea with an aluminum jet drive. Spray down with vinegar as it disolves salt and then rinse well.

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    Quote Originally Posted by snake_charmer View Post
    ................I wonder this because i want to use my boat in salt water, and a radiator would help me avoid corrosion and extra steps to avoid said corrosion. i know there are closed loop systems available, but most if not all do not recommended to use in salt water.
    My only boating option is salt water, so my Dad's jet, my jet and my brother's jet all got used in salt water. Only minimal corrosion on the jets. Engines were pretty much stock, cast iron intake, logs, etc. to they held up fine for the most part.

    First, I would suggest you trailer the boat rather than keep it in a slip. Leaving the boat in the water opens up a whole can of worms with regards to corrosion. (electrolysis etc)

    The consequences to your boat all depend on your configuration. If you have a standard engine and logs, flushing out the engine and washing down the boat goes a long way to keeping the corrosion issues in check.

    If you have an engine with aluminum parts - like intake manifold and/or heads, then you need to much more meticulous. Oldseddie suggests vinegar, others swear by "Salt Away" and other products to help dissolve the salt so it will rinse off. Steel headers will rust - period. An occasional use you won't notice, but extended/repeated use you will see them deteriorate quickly. Fortunately there is stainless available.

    Bottom line - use the boat, have fun and keep up with cleaning and maintenance.

    Doug

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