Today's Message Index:
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1. 08:03 AM - Evans from First Fill (Jeffrey A Beachy)
2. 09:14 AM - Re: Evans from First Fill (Carlos Trigo)
3. 09:25 AM - Re: Evans from First Fill (Gilles Thesee)
4. 05:00 PM - Re: Evans from First Fill (Roger Lee)
Message 1
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| Subject: | Evans from First Fill |
Earlier I asked about needing to flush a brand new 912 since the factory
had coolant in the lines to do test runs. I received this reply from
Rotax via LEAF:
The factory runs a 50/50 mixture of conventional cooling liquid.
If he wants use Evans he need not to flush the cooling circuit. There is
not so much residue in the system that it is a problem. This small amount
of water will evaporate out of the radiator cap when the engine is hot
enough.
Jeff Beachy
Zenith CH701, 912ULS
Message 2
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| Subject: | Re: Evans from First Fill |
Jeff
I am not an expert nor a mechanic, only a pilot / builder, but from what
I heard and read, EVANS coolant cannot be mixed with water, even a small
quantity, therefore if I were you, I would drain carefully all the
circuit and flush it thoroughly.
By the way, I am a bit confused about this coolant issue in 912 engines,
because I received a mandatory service bulletin from ROTAX, saying to
use EVANS coolant, and now you received a reply saying that the factory
runs a mixture of conventional cooling liquid !??...
Which is correct?
Carlos
----- Original Message -----
From: Jeffrey A Beachy
To: rotaxengines-list@matronics.com
Sent: Wednesday, March 07, 2007 4:00 PM
Subject: RotaxEngines-List: Evans from First Fill
Earlier I asked about needing to flush a brand new 912 since the
factory had coolant in the lines to do test runs. I received this reply
from Rotax via LEAF:
The factory runs a 50/50 mixture of conventional cooling liquid.
If he wants use Evans he need not to flush the cooling circuit. There
is not so much residue in the system that it is a problem. This small
amount of water will evaporate out of the radiator cap when the engine
is hot enough.
Jeff Beachy
Zenith CH701, 912ULS
Message 3
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| Subject: | Re: Evans from First Fill |
Carlos,
>
> from what I heard and read, EVANS coolant cannot be mixed with water,
> even a small quantity, therefore if I were you, I would drain
> carefully all the circuit and flush it thoroughly.
The Evans is mainly propylene-glycol that mixes nicely with water. What
Evans means, is that when mixed with water, the propylene-glycol boiling
point gets lower than when pure. So the ability to run without boiling
at atmospheric pressure is lower, but it is no problem with our
pressurized coolant circuits.
>
> By the way, I am a bit confused about this coolant issue in 912
> engines, because I received a mandatory service bulletin from ROTAX,
> saying to use EVANS coolant, and now you received a reply saying that
> the factory runs a mixture of conventional cooling liquid !??...
The Rotax SB says that you CAN use Evans instead of the 50/50 mix. They
don't say that you SHOULD or MUST.
Only thing, the limitations are not the same following which coolant you
put into your engine.
Also, as physics dictates, they advise you that the Evans specific heat
is lower, so your engine may run hotter.
So if your cooling is marginal, something must be done.
Best regards,
Gilles
http://contrails.free.fr
Message 4
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| Subject: | Re: Evans from First Fill |
Hi Guys,
During my class with Eric Tucker from Rotax he stated that you should just go ahead
and use the 50/50 mix and not worry. He stated that if you are running really
high temps then use the Evans. The Evans helps the engines hot spots from
vaporizing water and causing problems at that hot spot. Evans will run slightly
hotter anyway, as much as 30F-40F. That being said I have used Evans for 4
years in my Rotax without any issues. It is a personal choice, unless you run
really hot.
You are right about not worrying about residual water in a new engine out of the
box. If it is an engine that has the 50/50 mix in it right now then use the
Evans Prep fluid first.
Even if you drain a Rotax engine you can never make it totally dry of all water.
There are places you can't get to. If you are really worried about any residual
then run some prep fluid through it and sleep at night. :D
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=99369#99369
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