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A new Evans Question

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ricklach

Joined: 20 Jun 2006
Posts: 127
Location: Kernville, Calif.

Posted: Thu Jan 18, 2007 12:26 pm Post subject: A new Evans Question

I have read all the "SB" and all the thoughts posted on this List and I am undecided about which way to go.  I have read on this List that the Evans product dose not pull as much heat out of the motor as the 50/50 mix dose.  So all other things left unchanged, the engine will run hotter with Evans than with the 50/50 mix. I have also read post that say it is FLAMABLE, see link below. If this is true and a leak accurse in the cooling system near an exhaust pipe that could be a big deal.  The Evans product defiantly works at a higher temperature than the 50/50 mix dose, but I’m not so sure that’s enough to make it worth changing.    



Link to one Flammable post:

http://forums.matronics.com/viewtopic.php?t=21513&highlight=sb912043king the change considering the drawbacks. 



Rick

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larry(at)macsmachine.com
Guest

Posted: Thu Jan 18, 2007 1:08 pm Post subject: A new Evans Question

Rick,

You are probably right about reconsidering use of a Evans coolant mix. 

If you worry about cooling at all, the first concerns should be if you 

have adequate cooling at all or are you at the edge of overheating. 

Evans doesn't resolve that by simply not boiling off. Excessive temps 

localized to spots within the engine should not be allowed to occur in 

the first place. Different if you are using an unlimited race car 

stripped of everything to achieve a brief maximum. The airplane engine 

needs consistent cooling while idling, taxiing or climbing out of the 

pattern. Evans is not an end run around a mediocre cooling situation. 

When antifreeze 50/50 provides the advantage in real cooling, I'd be 

unlikely to trade off to the promise of better control of excessively 

high temps when a proper radiator and hoses should do the job. Without 

the flame issue, most good cooling designs don't need the extra cost, 

complexity, special handling and change that goes with a "special coolant".



Larry McFarland - 601HDS at www.macsmachine.com



ricklach wrote:

 	  Quote: 	
		   



 I have read all the "SB" and all the thoughts posted on this List and I am undecided about which way to go.  I have read on this List that the Evans product dose not pull as much heat out of the motor as the 50/50 mix dose.  So all other things left unchanged, the engine will run hotter with Evans than with the 50/50 mix. I have also read post that say it is FLAMABLE, see link below. If this is true and a leak accurse in the cooling system near an exhaust pipe that could be a big deal.  The Evans product defiantly works at a higher temperature than the 50/50 mix dose, but I’m not so sure that’s enough to make it worth changing.    



 Link to one Flammable post:

 http://forums.matronics.com/viewtopic.php?t 1513&highlight=sb912043king the change considering the drawbacks. 



 Rick





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=88669#88669

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Bill(at)flyinmiata.com
Guest

Posted: Thu Jan 18, 2007 1:19 pm Post subject: A new Evans Question

Most of the listed benefits can be achieved with slightly lower antifreeze concentrations (which improve heat transfer over a 50/50 mix) and higher pressure rad cap, which raises the boiling point. 

TurboDog's Dad

Bill Cardell

www.flyinmiata.com 

1-800-FLY-MX5S

970-242-3800



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arno7452(at)bellsouth.net
Guest

Posted: Thu Jan 18, 2007 1:34 pm Post subject: A new Evans Question

Larry,

Excellent assessment.  If its not broke, don't "fix" it.



Ken Arnold

CH701 on order



---

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ronlee

Joined: 25 Dec 2006
Posts: 141

Posted: Thu Jan 18, 2007 5:16 pm Post subject: Re: A new Evans Question

I don't understand the questioning of the engine manufacture (Rotax) recomending Evans. If they did not feel it was a benefit ,  they wouldn't recomend it. 

 It isn't the overall temp. of the engine, but the steam bubbles that form in pockets in the heads, and they offer very little cooling in the area they form. Steam absorbs VERY little heat, therefore, damage can occur to the area of overheating, not to mention pre-ignition etc. Rotax makes a very good engine. I would bet they know what they are talking about. Myself,  I use Evans and live and fly regularly in temps over 100. Considering the cost of my 912s I will adheare to Rotax recomendations. It may just be to costly not to!

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_________________
Ron Lee
Tucson, Arizona

David X

Joined: 10 Jan 2006
Posts: 154
Location: Princeton, NJ, USA

Posted: Sun Jan 21, 2007 8:32 pm Post subject: Re: A new Evans Question

I had the coolant changed to Evans before a long cross-country. The oil temp got near 230 over Kansas when there was a 106 surface temperature. I had to back off the throttle a bit to keep it within range. The oil temperature dropped another 10 degrees after I eased back on the throttle ... so I have no doubt that the coolant does its job well enough.

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_________________
Zodiac 601 XL - CZAW Built - Rotax 912S
DO NOT ARCHIVE

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