> When I first looked into Evans years ago, saw the specific heat value, then I too discounted it. I too thought it was a crutch for a bad cooling design. At the time I reasoned that it would have to increase drag. And it does...... if you assume all of the other factors are the same. However, if the user just operated at a temperature 10 or 15F higher than normal, then there is no drag increase. So as time has passed, I realized it can be a significant safety advantage. Now I think it's worthy of consideration. Tracy makes excellent point regarding nucleation. That said, I too am resistant to using it. I never have, and prefer to do everything I can to use conventional coolant and standard temperatures. But if I'm unable to obtain the safety margin conventionally, then I will definitely try it. Racing Beat article is interesting. But I try to keep in mind that that's just some guy writing the article. So I always seek other evidence. If the author included facts that supported logic, then I'd be much less skeptical. I am familiar with Asian design practices. They put a great deal of effort into reducing sensitivity to things like coolant and oil temp. They know that increasing that margin by 5 or 10F, they dramatically reduce warranty issues and improve customer satisfaction. So if the engine was temperature sensitive in the past, they would put lot's of effort into reducing that. Of course, I'm not encouraging running engine hotter. But I do encourage skepticism. -al wick Cozy IV powered by Turbo Subaru 3.0R with variable valve lift and cam timing. Artificial intelligence in cockpit, N9032U 240+ hours from Portland, Oregon Glass panel design, Subaru install, Prop construct, Risk assessment info: http://www.maddyhome.com/canardpages/pages/alwick/index.html ----__JNP_000_27e9.0783.7da6 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: quoted-printable

On Fri, 5 Jan 2007 11:51:18 -0500 "Ed Anderson" <eanderson@carolina.rr.com>= =20 writes:

<<I do agree catastrophic boil-over is = something to=20 be avoided. But, IF the problem is your system can't keep up with = your=20 heat dissipation needs, then the system needs to be fixed, substituting&= nbsp;a=20 coolant with less heat carrying capacity and raising the operating=20 temperature just does not seem the right course of action - in my= =20 opinion.

When I first looked into Evans years ago, saw the specific heat value,= then=20 I too discounted it. I too thought it was a crutch for a bad cooling=20 design. At the time I reasoned that it would have to increase drag. = And it=20 does...... if you assume all of the other factors are the same. However, if= the=20 user just operated at a temperature 10 or 15F higher than normal, then = there is=20 no drag increase. So as time has passed, I realized it can be a significant= =20 safety advantage. Now I think it's worthy of consideration. Tracy = makes=20 excellent point regarding nucleation.

That said, I too am resistant to using it. I never have, and prefer to= do=20 everything I can to use conventional coolant and standard temperatures. But= if=20 I'm unable to obtain the safety margin conventionally, then I will = definitely=20 try it.

Racing Beat article is interesting. But I try to keep in mind that = that's=20 just some guy writing the article. So I always seek other evidence.&= nbsp;If=20 the author included facts that supported logic, then I'd be much less= =20 skeptical. I am familiar with Asian design practices. They put a great deal= of=20 effort into reducing sensitivity to things like coolant and oil temp. They = know=20 that increasing that margin by 5 or 10F, they dramatically reduce warranty= =20 issues and improve customer satisfaction. So if the engine was temperature= =20 sensitive in the past, they would put lot's of effort into reducing that.

Of course, I'm not encouraging running engine hotter. But I do = encourage=20 skepticism.

-al wick
Cozy IV powered by Turbo Subaru 3.0R with variable = valve=20 lift and cam timing.
Artificial intelligence in cockpit, N9032U 240+ = hours=20 from Portland, Oregon
Glass panel design, Subaru install, Prop construct= ,=20 Risk assessment info:
http:= //www.maddyhome.com/canardpages/pages/alwick/index.html

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