Thanks to Murry, it seems a whole new set of cool possibilities has
arisen for warming up our Wankels.

It's been a long time since I worked on diesel trucks, so I was'nt aware
of Evans coolants. I just read through a couple long threads on an RX
forum debating the issue. For more than a year now I have read this
forum and have not heard of this stuff. If it's true the pressure
remains low, or even zero, then we should be chasing this one down in a
hurry. I have used water wetter for a long time in my porsches and MX
bikes. According to what I have read so far, I would have saved myself,
and a lot of other people, many headaches by using Evans coolant products.

So what is it? Are the diesel guys wrong, and are the few RX enthusiasts
similarly deluded, by promoting Evans products? Obviously, there are a
lot of advantages in using a coolant that does not vaporize within the
passages at or near zero psi; and what sort of pressure will we see if
we use it in our pressurized systems? If it does'nt vaporize, or
vaporizes very little, then we have a winner don't we?

The stuff's not that expensive. Who wants to be the first to try?

Search for Evans NPG+, on ebay.

Anyone have a good set of specs on this stuff?

Ed Carver

I know people have used it but someone mentioned the heat transfer
coefficient between coolant and metal is lower than ethylene glycol.
Evans coolant is mostly propylene glycol.
In order to properly test it one must have a "cylinder" head temp sensor.

Paul Lamar


Someone could do a bit of their own lab testing..  Make a little metal can capable of holding a 15 lb radiator cap. Put a thermocouple on the inside of the bottom. Put a sample of the coolant in the can and then heat on a burner. Record the rise in temperature. Using the same burner setting, try the other coolant sample..  Compare the temperature rise, and peak temperature.  And pressures.
[and coolant temperature.]

Matt-

Good idea Matt. Make the can out of aluminum on a lathe. Keep the temperature
below 500 F to simulate a rotor housing. Use an infrared thermometer as it is easier than a thermal couple to measure the can temperature.

Paul Lamar