Automotive antifreeze vs. RV antifreeze for engine. - Page 2 - SailNet Community
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post #11 of 19 Old 09-28-2009 Thread Starter
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The boat does not have a heat exchanger - raw water cooled per the definition. There was green coolant in the engine cooling passages/water pump.

Derek.-

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Originally Posted by JohnRPollard View Post
I'm still a bit confused.

So, you found green automotive type anti-freeze in which part of the cooling system? Was it in the closed loop, or the raw water/heat exchanger loop?

You should have automotive-type antifreeze in the closed loop. But for winterizing the raw water/heat exchanger loop, the non-toxic Marine/RV anti-freeze is what you need.

No need to drain the "fresh water" loop (i.e. the closed part of the system that contains automotive-type anti-freeze) for winterizing.

[P.S. Just in case we're using different terminology -- when you say your A-4 engine is "fresh water cooled", to most people this means your engine is cooled by anti-freeze in a closed loop that is in turn cooled by raw water in a heat exchanger.

We say a boat is "raw-water cooled" when it doesn't have a heat exchanger, i.e. raw water is forced through the cooling veins of the engine and then expelled overboard.]
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post #12 of 19 Old 09-28-2009
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Originally Posted by dman535 View Post
The boat does not have a heat exchanger - raw water cooled per the definition. There was green coolant in the engine cooling passages/water pump.

Derek.-
Okay, that clarifies things quite a bit.

You have a raw water cooled engine, and last winter someone winterized it with automotive style antifreeze.

Unless you have a perfect method for capturing and purging every last drop, it would be much better for the environment to winterize your cooling system with the non-toxic marine/rv anti-freeze. The automotive style anti-freeze is nasty toxic stuff and completely unnecessary for your purposes.

Depending where you live, you will want the -60 or -100 version. Don't dilute it for the engine (it begins to congeal at much higher temps than the temp at which it is rated against freezing solid). Most of the major brands contain corrosion inhibitors.


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post #13 of 19 Old 09-28-2009
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I spent many a yr in a development lab doing as part of my job, antifreeze boil testing with gasket materials to confirm compatibility. We would look for tensile strength loss, weight gain, creep relaxation, swell, compression set, etc...... Not all antifreezes are the same! They have ethylene or propylene glycol with; heat transfer, water pump lubrication, anti corrosion, Ph stabilization, scale prevention, anti oxidation additives just to name a few.
I found Prestone to be kindest to gasketing material. I used it in a 70 Chevelle for as long as I can remember. I would give it or an equivalent serious consideration for a closed cooling system that required repeated hot and cold cycles (long life coolant compatible). For just doing a cold soak protection over our short winter season, I use the pink RV antifreeze, $3.00 a gallon and it dumps into the lake, open system not on a closed loop system. I like the non toxic feature. I'm not running the water pump or exposing the engine to repeated hot cold cycling where the additive packages would have superior protection. I just change out the zincs prior to winterizing.....

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post #14 of 19 Old 09-28-2009
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I spent many a yr in a development lab doing as part of my job, antifreeze boil testing with gasket materials to confirm compatibility.
Wow, this place has everyone! Glad to meet you Roline. Excellent post.

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We would look for tensile strength loss, weight gain, creep relaxation, swell, compression
Did anyone else think he was talking about them?

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post #15 of 19 Old 09-29-2009
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FYI..
I have also heard of using cheap vodka for your fresh water systems in a pinch. hickup!
gh
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post #16 of 19 Old 09-29-2009
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NON-TOXIC is a bit misleading as If you read and MSDS it SAYS

MSDS - Detailed View

LESS-TOXIC is a bit closer and they all say don't break the clean water act by dumping it

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post #17 of 19 Old 09-29-2009
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gh...
How'd you drain it in the Spring?

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post #18 of 19 Old 09-29-2009
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In the spring you pour in some olives and vermouth... then do what comes natural.
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post #19 of 19 Old 09-30-2009
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Quote:
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FYI..
I have also heard of using cheap vodka for your fresh water systems in a pinch. hickup!
gh
At the prices for even cheap vodka ... what a waste of vodka!

I'd rather use cachaša anyways - if it weren't so blamed expensive up here in the States.

No, not in my engine.
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