I am interested in your thoughts regarding Evans Waterless Coolant For
rotaries and older classic cars (1950s).
Have you had experience with the product?
http://www.evanscoolants.com/evans_waterless_engine_coolants.html
http://www.evanscooling.com/

john  hedblom

People have used it in aircraft.

What is questionable is the coefficient of heat transfer between the
coolant and the metal. I would test it with a thermal couple "cyl"
head temperature device. Just because the coolant is temperature x
does not mean the metal is being cooled.

Paul Lamar

There are 4? types of Evans coolant. They been used for drones, Rotax
engines, and it is in many heavy trucks, race cars and regular cars.
This stuff boil at 375 F, so there is less chance of bubbles forming at
hot spots in the cylinder heads for  example, and pressure is not needed
for raising boiling point.  The stuff is expensive, although it is   a
lifetime coolant, the rest of the cooling system is not lifetime. Loss
of a hose or water pump seal, and you will lose the stuff. No coolant
pressure make this less likely.
In engines, the most important thing is the coolant cannot boil, it can
be higher temp.  higher temperature also means the temp. difference is
greater, increasing cooling efficiency.The problem comes when the system
temp is at say 250F, long before that, hot coolant already boiled and
bubbled at hot spots, making uneven cooling. This is where Evans shines.
This coolant is not water, it will cause less corrosion. In your car,
the theoretical boiling temp is 256F when you have 50/50 mixture of
water and anti freeze and 15 PSI pressure. If it gets near 240F I would
have felt very uncomfortable. I would start trying things like shut off
the A/C, slow down, and turn the heater on.
Evens used to sell a flushing liquid, may have been discontinued. It is
important to get rid of as much water as possible when changing over.
Those at the southern states can drive with the rad cap loose, till the
water evaporate away.
Tony Lam