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.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 isa
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


 My first off airport landing was caused by me buying into that logic.  I
 had a small leak in my cooling system and wanted to minimize coll ant
 pressure to get the plane home.  I switched over to evan's coolant and
 installed a 7psi radiator cap.  It turns out that 7 psi was not enough and
 all the evans coolant boiled out via the overflow.  The engine ran for a
 couple minutes until the rotor housings melted.  I landed on Hwy 395 near
 Bishop.

 I still don't use Evans Coolant. The fact that it can get to higher temps
 before boiling is of no use to us.  We want our coolant temps down around
 180.  To that end, standard coolant does a better job.  There are probably
 some excellent applications for Evans, but high duty cycle Mazda rotary
 engines are not one of those applications.


 --
 David Leonard

 Turbo Rotary RV-6 N4VY
 http://N4VY.RotaryRoster.net
 http://RotaryRoster.net

 I live in Queensland and only use additives for anti corrosion,
if you need antifreeze OAT will help with cooling. Most glycols
recommend 50/50 max due to the effects of reducing the water
content, what is the point of a higher boiling point if you
are going to see those temps, water has good heat absorption
properties and is  readily available, draws off heat better
and is proven. If you are going to switch then test it near
to the airport or in your car first. Those that ignore history
are doomed to become history.


Graeme Riley


I am curious, David Leonard. Did you ascertain that ALL water was removed from the cooling system? Leaving in more than 3% water will negate the advantages and water boils! You cannot add Evans to top-off the header tank.
john  hedblom