Good Morning, I am working on a project that is designing a water pump for a car engine without any mechanical parts (works on waste heat building pressure to circulate the water). I know that most of the car engine heads are aluminum and that blocks are part cast steel and part aluminum. In order for my design to work i need to reach boiling temps of pressurized water, which might get high (depending on the pressure). What are the highest temperatures that can be reached in a car coolant system without harming the mechanical properties of the metals surrounding? Also to be considered is the oil temps, what temps to oils break down and stop being efficient? *note: What i am designing isn't based on the same principles as Thermosyphons.