Someone posted the MSDS It's a mix of 69% ethylene glycol (regular antifreeze) with propylene glycol.
I think the advantages would be less corrosion and allowing higher operating temperatures without blowing a seal.
First let me say I am not suggesting anyone use Evans Coolant. I have not used it and do not plan to. There are a number of issues that have not been discussed here. One of those questions is the affect on the oil temperature if you operate at a higher temperature. I am aware it has had some success in the heavy duty truck business, but I do not know why.
I was around when the people developing Evans Coolant were racing Trans-Am. I have also been involved with a number of race engine projects. Developing a racing engine from a production engine, especially a highly turbocharged engine, requires a lot of work on controlling the heat generated. One of the tools used on the dyno as well as track development are lots of thermocouples in the cylinder head to insure the cooling system is not boiling. It is absolutely correct that there is a very large amount of heat transferred when water changes from liquid water to steam, there is also a volume change that influences whether it is a good idea to boil water around the exhaust valves. The volume difference between water as a liquid and a gas is 1600 times. I would suggest that if you could control the boiling around the valves and the bubbles could flow away the cooling system would be very efficient. Let’s look at some of the problems. The area inside the water jackets is very restricted, and despite improved designs and castings the flow is not even to all areas. Cooling systems are designed to remove a specific amount of heat under specific conditions. Change the outside air temperature and the heat rejection rate changes. Increase the power of the engine from the original design and the system will need to reject more heat. Engines operate at different power levels. As the power level changes the heat rejected changes. If you have an engine that operates over very different power levels and control the heat rejection level if you have the huge heat transfer from the phase change from water to steam. It takes one BTU to raise the temperature of one gram of water one degree. It takes something over 500 BTUs to change water liquid to water gas at the same temperature.
Vapor lock is a fuel problem, where the gasoline vaporizes in the fuel line and prevents further flow of fuel. It is no longer a problem on modern cars with fuel injection and high pressure fuel systems.
Vapor lock in a cooling system would have be the result of an improperly designed system, and rarely, if ever, happens in modern cars.
A properly designed cooling system would take into account localized boiling and take advantage of it. I haven't heard that it is a problem in modern cars, particularly our MINIs.
Still, running 100% antifreeze is a very poor idea.
