Non-pressurized cooling system with propylene glycol coolant

[moribundman]

Evans Cooling System

 

[DJ]

OLD snake oil


As far as their statements about boiling in the waterjacket maximum heat removal is achieved by the water just begining to form bubbles like at the bottom of a pot just before a rolling boil, but in a circulating coolant system those bubbles are washed away before a rolling boil occures and the mixing with the coolant in the rest of the jacket condenses them. Water is also a better conductor of heat.

 

[wileyE]

We tried it on homebuilt airplane that was overheating during taxi. Went the full route, removed ALL water, low pressure cap etc. It did solve the boilover problem but the coolant temp ran higher. Wouldn't have been an issue but we were fighting a detonation issue at the time so the added running temps made us go back. If we had not had this issue I think it would have been fine.

 

[Gary Allan]

DJ ..Evans says right on their site that water is the best coolant for heat transfer. I haven't heard the term rolling boil since boiler skewl.

PG doesn't work well in all systems. In my jeep engines, for example, to aid in quick warm up (my 4.0 is at operating temp within a 1/4 mile with a 70+F start up temp) are substantially bypassed. The cooling system, although adaquate, is an "also ran".

 

[carock]

I really went into the Evans cooling system pretty deep to solve some cooling problems in Mini Coopers, modified cars with turbochargers, and some monster 1000hp V-8 race cars. Basically your cooling system willl need several changes to work well with Evans coolant because it does not tranfer heat as well as water and it is more viscous than water. So you need a different radiator and water pump to solve the viscosity problems. You also need a larger radiator and/or better airflow to solve the heat transfer issues.Their propoganda side steps these issues and they even have the nerve to say that people "just do not understand how it works".Well, for the most part it does not work. That is why no manufacturer uses it. I also don't like that they advertise that Nascar teams use their coolant when Nascar teams are required to run water by the rules.

 

[Gary Allan]

I agree with you carock ..if you're trying to maintain the former "normal temp". It's not for anyone in a 4 season climate (or much of a 4 season climate). Temperature, in itself, isn't destructive to engines. Caviation and superheating is.


It's not for everyone.