Originally posted by projectSHO89:
...The pressure in the system is one of the more important issues that gets overlooked. As long as the system stays pressurized, the boiling point of the coolant (whatever it is) is raised substantially and it continues to transfer heat as well as it can.
Steve
Most engines, are designed to operate efficiently around 230 F to 250 F.
http://www.findarticles.com/p/articles/mi_qa3828/is_200308/ai_n9294683
If it is distilled water, it boils at 212 F. With the build up of pressure, the boiling point will go up, but not much higher than if it had coolant in it. If it boils, heat will not be transferred from the engine as efficiently. The increased pressure assists the coolant to flow faster and transfer heat away from the engine faster too. Yes, the increased pressure is very important as it assists in the transfer of heat from the engine.
Running straight coolant will cause the engine to overheat (the cooling system needs water and coolant to make it efficient).
I do not agree with your reasoning and you do not agree with mine. Maybe a radiator/cooling system expert lurking can sort this out. In the meantime, I will suggest what I think might be a solution and I am sure you will suggest what you think may be the solution too. 
Last edited by Tony2005; 07/17/06 06:45 PM.
