Hi all

 

I'm sure someone with a physics degree will explain this (alas I've forgotten most of my O-level physics ;) ) but as I've just bought a Nismo 13kg rad cap why is it better for the cooling system than the stock 12kg one? :confused:

 

Many thanks

 

Richard :D

Water heated under pressure is known as "Super heated" the boiling point of the water is raised in relation to the pressure it is under, so if a small increase in pressure is applied by fitting a different cap the boiling point is raised further in theory this allows the water to handle more heat from the engine without boiling.

 

My opinion though is that a 10 to 15 year old cooling system may well not be happy with too much increased pressure, keeping it sensible should be ok though, water wetter is a better idea in my view.

 

Hope that helps

 

Jeff TT

People who get the nismo rad cap often find that the hoses blow because they can not take the extra pressure.