I remember seeing an analysis of several different anti-freeze/coolant
products that were effective in improving coolant performance.  But,
for the life of me, I cannot find it.  Paul, did that come from your
list?  If so, could you re-post?

Best Regards,

Steve


Are you talking about Evans coolant?
Propylene glycol
Molecular formula     C3H8O2
Propylene glycol Boiling point     188.2 °C

Ethylene glycol Boiling point     197.3 °C (470 K)


"Propylene glycol, known also by the systematic name propane-1,2-diol, is an organic compound (a diol alcohol), usually a faintly sweet, odorless, and colorless clear viscous liquid that is hygroscopic and miscible with water, acetone, and chloroform."

I am no chemist but as I understand it the  thermal conductivity is lower than Ethylene glycol. Evans wants you to increase the water flow to make up for it.
In fact Evans sells their own Chevy water pump for this purpose.

This may be OK in a modest power rotary as the rotor housing runs about 100 F below that of a piston engine.

The higher boiling point is a plus.

I think Ken Welter has been running it for a few years with no problems.

The bottom line is you need to measure the metal temperature just below the
the lower spark plug adjacent to the combustion chamber which is the hottest part of the engine to be sure. That should be kept below 500 F.

Paul Lamar

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