coolant

by Michael Sweeley in General Tech Discussion 9 years ago

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Re: coolant

by MARK JACKSON » 9 years ago

MARK JACKSON

12 332 11

Hi Roger

I was flying in a balmy 14 degrees c today with Evans coolant and my temps were perfect. You need to get in the real world, instead of all that sun from morning to night, ( it can't do you any good).

I just don't understand why Rotax would say what they are saying about Evans without any good reason.

I'm off to bed now, my electric blanket has been on for 30 mins, and I'm not joking.

Mark

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Re: coolant

by Roger Lee » 9 years ago

Roger Lee

126 5.13k 4.54k

Hi Mark,

14C is our morning temps right now, but not for long. About 29C for highs right now.
I have found that the warmer OAT regions, tight cowled engines and or poor air flow setups just tend to run too hot with Evans. I used to own a Kolb Mark 3 a long time ago with an open air engine. Evans was in okay in that because it could dump heat fast enough. My Flight Design CTSW with a tight cowl runs too hot in the warmer months. I tried it, but went to 250F on oil temps. Using 50/50 I never see over 230F in a good long climb. 212F in cruise with high OAT's.

I just spent the last week in central Florida. Rained every day, the river flooded, humidity was 80-100 % and the temps never got below 63F with the highs around 80-84F. Got out of the shower and dried off and I was still wet, went for a walk I was wet, played with the dog and I was wet. Tired of being wet. :(

On a plane as I type this headed home to cool dry climate. :woohoo:

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: coolant

by Michael Sweeley » 9 years ago

Michael Sweeley

8 25 0

You guys should try Alaska! In Fairbanks summer temps are often 80F, in the winter -50F now that is a challenge for a coolant.
Mike

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Re: coolant

by Roger Lee » 9 years ago

Roger Lee

126 5.13k 4.54k

Anything below 32F and I want to drink the coolant. I'm looking for a jacket below 72F. :pinch:

Tucson, AZ elevation 2400'-3600' MSL
52F this morning and 81F today. 49F tomorrow morning and 78F high. Perrrrrrfect. :lol:

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: coolant

by Michael Sweeley » 9 years ago

Michael Sweeley

8 25 0

Here is some interesting info from Union Carbide there product is an Ethylene based mixture vs NPG which is Propylene based produce. They categorically state that an EG based coolant prevents engine cooling system cavitation which is worrisome with a PE product (Evans), I believe this is what Rotax is concerned about. I wonder how Rotax feels about EG based coolants?
Mike

Cavitation Protection
Cavitation corrosion of power cylinder liners is a phenomenon caused by the
motion of the wet sleeve liner following the piston head rocking on the wrist pin
and striking the liner. During the motion of the liner, an air bubble may form.
When the bubble collapses or implodes, the energy from the implosion causes the
liquid to impinge on the surface of the liner. This impingement has enough force to
remove the protective corrosion inhibitor film or, in severe cases, gouge metal from
the surface of the liner. Because this metal gouging, or corrosion, can be
catastrophic due to perforations of the liner in high-speed engines, many methods
for mitigating cavitation have been investigated.
Laboratory testing performed by suppliers of other commercially available fluids
has shown some success in controlling cavitation through the use of industrial
grade PG-based coolants that contain an inhibitor system similar to the inhibitors
used in traditional ethylene glycol-based coolants. Despite apparent success during
laboratory testing, field testing on the effectiveness of PG-based coolants has
exhibited little success in mitigating cavitation. The corrosion inhibitors used in
traditional coolants do not provide the protection required to prevent damage
caused by the bubble implosion and fluid impingement. However, field testing has
demonstrated that a different type of corrosion inhibitor, as found in EG-based
NORKOOL® SLH Coolants and NORCHEM™ Inhibitors, protects against cavitation
corrosion by forming a protective film that is much harder and more tightly
adherent than the protective film formed by traditional inhibitors. Therefore, Union
Carbide’s NORKOOL/NORCHEM program of SLH coolants and inhibitors are
much more effective in mitigating cavitation in high-speed engines than using a
traditional PG-based coolant.
Freezing

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