One last point, and then I'll shut up about this.

You'll notice that the viscosity of NPG+ is considerably higher than that of water or 50/50 up at normal operating temps.  While the coolant pump might be able to move 50/50 around just fine, it will be working harder to move the NPG.  This certainly isn't an issue if your coolant pump is loafing most of the time, but those pumps are generally matched to both the task at hand and the medium they'll be moving.  We think that this was a big part of the problem we experienced with the Eagle... the pump, hoses, and the rest of the system simply wasn't sized to accommodate the physical characteristics of this material.  I'm like you, though, and agree that much of what NPG has to offer appears far superior to 50/50... but I stick by the proviso of only if the system is designed with its differences in mind.  This means larger hoses, larger passages through the radiator, and a pump that will provide the proper amount of flow.  I wish Fred Moreno was still around, as he was a wizard with thermodynamics and could probably suggest an appropriate component list to make this stuff run the rings around 50/50 that it's supposed to.

 <Marv>



"DaveLeonard" <daveleonard@cox.net>:

 Marv, I agree completely with everything you said.  I fully plan to keep my
 pressure system in place and continue to monitor the pressure as a way to
 detect leaks.  The beauty of NPG is that if the system does loose pressure,
 it does not change the ability to cool.