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Re: Oil temps high, are Oil Coolers required?
by Bill Hertzel » 7 years ago
Checking the MSDS for Prestone "Dex-Cool" antifreeze shows it contains 2-EHA (2-EthylHexanoic Acid).
Rotax is just fine with this.
The rest of your cooling system may or may Not be so fine.
2-EHA is a great corrosion inhibitor.
It is also a good plasticiser, meaning it will soften plastics, Silicon Plastics in particular.
If you are certain all your hoses natural rubber you will be OK.
If any of the hoses are Silicon rubber, Not OK!
Ford and Chrysler no longer permit 2-EHA base coolants in their vehicles for this reason.
"Dex-Cool" is a GM label and may or may Not contain 2-EHA.
The color of the coolant Dye (Green, Yellow, Orange) also means nothing anymore.
The good news is that most Extended life "Dex-Cool " type antifreezes no longer contain 2-EHA.
See attached. The formulations may have changed so be sure to read the labels.
You just happened to pick one. If you have all Natural Rubber Hoses, No Foul.
More info at...
https://www.motor.com/magazine-summary/coolant-confusion-its-not-easy-being-green-or-yellow-or-orange-or/AntiFreezeComponents_2018-09-26.pdf (You do not have access to download this file.)
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
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Re: Oil temps high, are Oil Coolers required?
by Al Creigh » 7 years ago
Man you guys are a great resource.
I'll just pick a different one so there isn't any questions. I was just more looking at a general idea of what the coolant is like. I am going to be going to the auto store and find Dex-Cool and make sure it doesn't have that additive in it.
I found that if my grandfather had gone 100% coolant it would almost create a 20%-30% penalty. It not only doesn't cool as well but also creates increased viscosity.
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Re: Oil temps high, are Oil Coolers required?
by Roger Lee » 7 years ago
I use the Dex Cool orange extended life.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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Re: Oil temps high, are Oil Coolers required?
by Al Creigh » 7 years ago
So I changed out the coolant to valvoline DeX cool. The stuff with out the 2-eha.
I will admit I'm almost 100% sure it was pure concentrate that was in it as it was much thicker and a neon green color compared to the DeX cool.
New info:
Ran it on the ground after the coolant change held 4000 rpm for about 10 min and it did seem to continue to have a temperature rise. I throttled back after water hit 200 F and oil was getting too 185 ish.
WOT in air is 5800. So it doesn't seem to be a over prop issue.
What temps should I be seeing on the ground? Or is the only way to really know to fly?
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Re: Oil temps high, are Oil Coolers required?
by Roger Lee » 7 years ago
Go fly. Temps on the ground are not indicative to in air flight and the air being forced over the radiator.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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