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Old 10-07-2011, 06:28 PM   #1
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Post Mixing Antifreeze and Water?

I have Detroit Diesel 8v92's in my boat and have recently read a good amount on adding water to the antifreeze. Most articles say 30% - 50% is a good amount.
Should I be mixing my antifreeze with water? What would a good amount of water be?
Also how much of a difference would adding water make to the temperature of the engine?

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Old 10-07-2011, 06:33 PM   #2
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Water is a better fluid than straight antifreeze... Just go to any truck stop and buy the heavy duty coolant that is premixed....
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Old 10-07-2011, 06:57 PM   #3
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What does the engine manufacturer recommend? Nobody knows better than the manufacturer. Use what the manufacturer recommends, ignore any other suggestions.
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Old 10-07-2011, 07:03 PM   #4
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I have no clue hat the manufacturer recommended they are older engines and have little info on them. I will give my mechanic a call next week and ask him.
Im also looking to see how much of a difference it could make from running pure antifreeze.

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Old 10-07-2011, 07:11 PM   #5
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.........Im also looking to see how much of a difference it could make from running pure antifreeze.
Pure antifreeze is not a good heat transfer agent so you could overheat your motor. Also, some antifreeze's, unless mixed with water will freeze.
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Old 10-07-2011, 07:19 PM   #6
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Pure antifreeze is not a good heat transfer agent so you could overheat your motor. Also, some antifreeze's, unless mixed with water will freeze.
Thats pretty much what I have heard so far :/
At least it hasnt caused me any problems yet.

Anyone know where I could find a manual for the engine
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Old 10-07-2011, 07:28 PM   #7
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When you go to your favorite retailer, just about all the AF's you will see on the shelf will either be pre-diluted meaning you use it straight out of the bottle or it will be concentrated, meaning it needs to be diluted. I don't recall ever seeing any that suggested more than a 50% amount of AF, meaning nothing less than 50% water.
Yes, you can buy pre-diluted , but why pay extra to buy water. Buy 1 gallon of AF and mix with 1-2 gallons of water.
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Old 10-07-2011, 07:37 PM   #8
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Yes, you can buy pre-diluted , but why pay extra to buy water. Buy 1 gallon of AF and mix with 1-2 gallons of water.

X2
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Old 10-07-2011, 09:10 PM   #9
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I have no clue hat the manufacturer recommended they are older engines and have little info on them. I will give my mechanic a call next week and ask him.
Im also looking to see how much of a difference it could make from running pure antifreeze.
You can get the information if you try. If you have been running pure, undiluted antifreeze, you got some bad information or made a mistake in the past.

I have a hunch the back of the antifreeze container will give you a hint.
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Old 10-07-2011, 09:12 PM   #10
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I have no clue hat the manufacturer recommended they are older engines and have little info on them. I will give my mechanic a call next week and ask him.
Im also looking to see how much of a difference it could make from running pure antifreeze.
www.boatdiesel.com
Great membership based forum. Lots of knowledge and resources (including manuals).
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Old 10-07-2011, 09:18 PM   #11
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Antifreeze is supposed to be mixed with water 50/50. If you have a diesel with wet liners you also need DCA, yes diesel cooling addative.You should be able to purchase it at a truck or marine diesel store, it does come in some heavy duty coolants. This stuff is supposed to stop the water from boiling on the liners and pitting them.
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Old 10-07-2011, 09:21 PM   #12
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Detroit power cool. mix per instructions. use tester to add either power cool or distilled water. Cavitation and the damage it can cause to liners is a concern.

boatdiesel.com is the place to go for info on your engines, or you can get a manual for a reasonable price and learn more than you want to know.

58LRC now thats a boat
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Old 10-08-2011, 03:31 PM   #13
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Read the label on the coolant. They know what their formula requires. THere's a point where the right amount of water has the best properties. As said.. pure antifreeze is not as good as mixed.
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Old 10-08-2011, 04:18 PM   #14
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Detroit power cool. mix per instructions. use tester to add either power cool or distilled water. Cavitation and the damage it can cause to liners is a concern.

boatdiesel.com is the place to go for info on your engines, or you can get a manual for a reasonable price and learn more than you want to know.

58LRC now thats a boat
Yes I always use distilled water the minerals in tap water will raise hell with the passages in a diesel
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Old 10-08-2011, 05:18 PM   #15
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8v92's are very reliable engines but louder than most and rev higher.

50/50 water and antifreeze is standard. No need for anything special but depending on your water quality you won't go wrong with distilled water.

As I recall from years ago... Liners in diesel engines have a tendency to boil the water in spots within the water jackets on the liner. When this happens it creates pitting on the water jacket side of the liner. They make water filters that filter the crap out but add beneficial chemicals helping to prevent this problem. Unnoticed it can cause a liner failure.
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Old 10-08-2011, 09:40 PM   #16
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www.boatdiesel.com
Great membership based forum. Lots of knowledge and resources (including manuals).
Just became a member thanks
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