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  • Raymond Moran
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1 week 2 days ago #15749 by Raymond Moran
Raymond Moran created the topic: Coolant
Is there any reason not to use plain distilled water in a 912uls? I live in central Florida, freezing is not an issue.
I understand that you can dilute Dexcool, if so, how much? If lubrication is the issue , can additives be added to the distilled water? What is the cooling system capacity including the water cooler?
Thank You,
Ray Moran

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1 week 2 days ago #15752 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Coolant
The Operators manual recommends staying around 50-50 mix.

See also the Service Instruction SI-912-016

"Conventional coolant (with about 50% water content) has a specific thermal capacity that is higher than waterless coolant. It gives excellent corrosion protection, especially for aluminum, and protection against freezing."

Coolant system capacity is listed in the Line Maintenance Manual at approximately 1.5 liters (0.4 US Gallon)
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1 week 2 days ago #15753 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Coolant
PS: Here is the breakdown of the coolant capacity, taken from the 912 Installation Manual 75-00-00 page 24:

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1 week 2 days ago - 1 week 2 days ago #15756 by Roger Lee
Roger Lee replied the topic: Coolant
Hi Raymond,

Just using straight water is never recommended. Pure water lacks extremely important additives, plus water will boil at a much lower temp than a 50/50 mix. Pure water will allow the water to boil at a very low temp and when it does it will cause vapor spaces that will no longer cool. This is a good water to ruin your engine really fast. Worrying about freezing is only one aspect, but there are many others. You can buy regular Dex Cool 50/50 already to use at any auto store. There is no need to buy a concentrate and then mix it yourself. A gallon is about $15 and you'll only use about 3/4 gal.

en.wikipedia.org/wiki/Antifreeze

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last Edit: 1 week 2 days ago by Roger Lee.
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1 week 2 days ago #15765 by ERNEST BITTEN
ERNEST BITTEN replied the topic: Coolant
Follow up question. How often do you have to change Dex Cool 50/50? How many hours or years will it last before it looses its anti-corrosion properties?
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1 week 1 day ago #15774 by Raymond Moran
Raymond Moran replied the topic: Coolant
Hello, I think that is a question for Roger Lee. I would also like to know.
Thanks

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1 week 1 day ago #15776 by Roger Lee
Roger Lee replied the topic: Coolant
If you use Dex Cool 50/50 "Extended Life" coolant many just do it at the 5 year rubber change. If that bothers you and you're in a conservative camp then do it every 3 years.
It only takes about 15 min. to change fluid and cost is about $15 for a gal. of coolant. It don't think you can go wrong with either schedule. I have seen people leave it past 5 years, but I'm not a fan. Additives break down eventually.

Maybe Rob or one of the other guys here will weigh in.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
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1 week 1 day ago #15777 by Al C
Al C replied the topic: Coolant
DexCool claims 5 years. Not sure but if I remember right Rotax was saying less...like 2 years.
There are several third party additives at auto parts stores calling themselves coolant conditoers (not to be confused with stop-leak products) claiming to extend life and inhibit corrosion.

I would guess "your mileage may vary."

And issue related to coolant life is to check that there's no or "within spec acceptably low" electical voltage potential leak between the coolant and ground ...especially when plane is sitting hangared with all electrical supposedly completely turned off...as the plane spends far more hours in that state.
See
www.ve-labs.net/electrolysis-101/how-to-test
and other sources.

It's an easy quick test with a voltmeter.

My two cents.
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1 week 1 day ago #15779 by Al C
Al C replied the topic: Coolant
The manual recommends staying _around_ 50% coolant.

We run ours 60%.
At 60% two things are different than 50%:
a) Boiling point is higher. That's good.
b) Heat transfer capacity is a bit lower. That's not necessarily good if you're flying in very hot conditions and your installation tends to run hot.
Our Rotax tends to run cooler than optimal ...to the degree that we have to shutter part of the radiator. So "b" is good for us.

With you being in hot Florida you might consider running 40 or 45%, as it has slightly better cooling capacity than 50% at the cost of a very slight reduction in boiling point. Particularly if your Rotax tends to run hotter than optimal.
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1 week 1 day ago #15785 by Roger Lee
Roger Lee replied the topic: Coolant
For as cheap and easy that the coolant is to replace and you have to drain it for the 5 year rubber replacement that just seems like a good spot to do it.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
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1 week 6 hours ago - 1 week 5 hours ago #15793 by Bill Hertzel
Bill Hertzel replied the topic: Coolant
Well, Nuts!!!

I was fat, Dumb and happy until Roger posted that link to Wikipedia.

It appears that the term "Dex-Cool" no longer means much more than No Silicates and the color will be Orange.
Multiple companies manufacture products wth the term Dex-Cool in their name and wildly varying additives in their products.
They all contain >90% standard Ethylene Glycol just like classic Green Antifreeze. Just the additives have changed.

The classic Green Antifreeze is fine for engines with Iron blocks and copper radiators.
In the long term, it doesn't play well with the Aluminum Blocks and radiators in our modern engines unless it gets changed every two years, and people are just not willing to do the maintenance until it is too late.

Enter the Orange colored Extended life products that are gentler on Aluminum Engines.

General Motors started the Dex-Cool name long ago.
They (GM) are currently battling multiple class action suits because it has been claimed that the 2-EHA (2-EthylHexanoic Acid) additive is a plasticizer that accelerates the decomposition of Plastic, Nylon, and Silicon rubber products in the cooling systems. GM Head Gaskets are dissolving on a regular basis.

In looking a dozen MSDS sheets for common coolant products the good news is that most manufacturers do not use 2-EHA.
The bad news is that the one product that most people would likely grab by default (Prestone Dex-Cool Extended Life) still uses 2-EHA.

The AC Delco Dex-Cool Antifreeze produced by GM will likely continue to contain 2-EHA because if they removed it, it would appear to be an admission of guilt in the court battles.

Attached is a summary of the common Antifreeze products you will likely find on the shelves in the US.

Motorcraft Gold and the Valvoline products look particularly attractive to me.

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Last Edit: 1 week 5 hours ago by Bill Hertzel.

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1 week 4 hours ago #15794 by Roger Lee
Roger Lee replied the topic: Coolant
Dex Cool is just a general term. Several companies make a Dex Cool product.. i.e. Prestone and others. It is orange and considered extended life.

When it first came out it wasn't compatible with some other coolants without thickening. Now days it pretty much works with the average coolant, but I still don't mix coolants. You can top off if the reservoir bottle is low with distilled water if you want.

Roger Lee
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Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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6 days 10 hours ago #15799 by Raymond Moran
Raymond Moran replied the topic: Coolant
Hello Roger,
I want to thank you, you solved my problem.
I happened upon one of your posts regarding the oil thermostat, you indicated that you were not a fan. My oil temp was running 240F, I removed the thermostat and the temp dropped a solid 20F.

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6 days 10 hours ago #15800 by Roger Lee
Roger Lee replied the topic: Coolant
Hi Raymond,

Glad it worked out.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
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