Mailing List flyrotary@lancaironline.net Message #15426
From: Bob White <bob@bob-white.com>
Subject: Re: [FlyRotary] Re: Switching to Evans NPG+
Date: Tue, 18 Jan 2005 13:49:18 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Rusty,

Here are a copuple of links I got with a quick google search.
http://www.evanscooling.com/main3.htm
http://www.kneedraggers.com/details/38-EVANS-2

How soon are one of you guys going to try this stuff.  I'm going to be
puttting coolant in pretty soon.

Also, there is NPG, NPG+ (which apparently has some ethylene glycol in
it), and NPG-R which is lower viscosity but needs to be changed once per
year.   They are all $25-$26 per gal.

Bob White




On Tue, 18 Jan 2005 14:12:28 -0600
"Russell Duffy" <13brv3@bellsouth.net> wrote:

It works out that a volume of NPG+ is only 17% less efficient than the
same volume of 50/50.  Once hot, the vescosity is not an issue, being
only slightly more viscous than water (no system change usually
necessary).

>From the reports I've seen, it has to be true that there isn't a huge
difference in cooling performance.  Ken Welter has already stated that
he's changed back and forth a couple time, and didn't see any real
diff in temps. Loads of folks with RX-7's use it, and also don't
report any dire consequences.  At the same time, I'm not sure there
are global cooling improvements to be made either.   I believe the benefit of being able to run pressure less, coupled with
higher boiling point makes it worth trying for me.  Now if I can just
find some.  Have you found any good online sources?  Most of my normal
places don't carry it.   Cheers,
Rusty (engine repair status- one week down, and going nowhere fast)




--
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