[200q20v] Re: Evans Coolant NPG+

Larry C Leung l.leung at juno.com
Thu Nov 29 03:01:06 EST 2001

One potential risk (though I'm looking into this myself, as most of my
cooling system is new) is that the temps that NPG ran at (don't know
about the NPG+) are on average higher than EG. THe advantages are more
even head temps (no hot spots to cause detonation) and higher engine
efficiency (due to the Carnot cycle improving with every degree diff btw
intake and exhaust temps). The big advantage ('specially on knock
sensored cars and turbos) is that with reduced detonation, high temp
operation (such as track or fast road driving will have consistant power,
(same as a cool engine just at op temp) rather than reduced power as head
temps rise. That and the lifetime coolant. The higher overall temp MAY
cause the plastic bits a problem though, since temps, not pressure seems
to be the cause of brittleness of things like radiator end tanks and
after-run pumps, heater control valves, heater core endtanks, etc. I'm
considering this, but I'm just not sure.....


On Thu, 29 Nov 2001 00:34:51 -0500 Brett Dikeman <brett at cloud9.net>
>The Big Baby is overdue for a coolant change, and with winter
>approaching, figured now was the time to do it.  I also noticed one
>day that the gurgling noise coming from the engine has returned.
>Well, I'm wandering around the net using Google, checking into Evans
>yet again, but everything points to the stuff being just too thick.
>S-cars can't use the stuff at all, supposedly the pre-C4 cars have
>big enough passageways in the radiator.  Still, it's not
>confidence-inspiring that Evans recommends new radiators+pumps with
>the NPG.  Ah, no.
>Well, lo and behold, Evans has come out with a new version, NPG+.
> From the website(evanscooling.com):
>"A blend of non-aqueous ingredients, NPG+ retains all of the benefits
>of Evans original NPG coolant, while improving upon its thermal
>conductivity by about 32 percent and reducing its viscosity by about
>65 percent. It is perfectly suited for the demands of any hard
>working engine, and there are no plumbing or pump changes needed to
>use this coolant."
>Any thoughts?  I remember a few listers spoke vehemently against
>using NPG, and I -think- it was because of the viscosity problem.
>Well, if they've fixed that, is it worth a go?
>Oh...and I nearly fainted at the price.  Quantities up to 3 gallons,
>$25/gal.  That's some pricey coolant.  It will last the lifetime of
>the car, and one of the toted benefits is a zero-pressure system that
>supposedly makes heater cores etc last longer; if it prevents a
>heater core meltdown, it could easily pay for itself.
>Thoughts? Opinions?  Experiences(with the NPG+ that is)?
>"They that give up essential liberty to obtain temporary
>safety deserve neither liberty nor safety." - Ben Franklin
>http://www.users.cloud9.net/~brett/bdikeman.asc	(PGP Public

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