necessity of having a nismo thermostat

[g6civcx]

Originally Posted by TheRealNighthog

The point of bottle-necking the cooling system with a thermostat is to create higher than normal atmospheric pressure in the cooling system

Does the water pump have anything to do with raising coolant pressure?

Originally Posted by TheRealNighthog

Notice that the bottle-necking only occurs before the coolant re-enters the block and obviously after it has circulated through the radiator.

I'm no expert in fluid dynamics. Does the pressure equalise as soon as the thermostat opens, assuming the appropriate loss of course? Is the water pump forcing coolant flow through the system?

Originally Posted by TheRealNighthog

the spring in the radiator will not let any of the coolant move to the overflow reservoir until the cooling system reaches a certain pressure.

Can you describe a little more how the radiator cap works?

Originally Posted by TheRealNighthog

The block has to stay at a certain temperature, which is why the need for the thermostat. That's why the needle on the temperature gauge shows the coolant being colder than normal when you have no thermostat in place.

What's the reason why the needle stay low?

Originally Posted by TheRealNighthog

The various ratings of the thermostats help ensure that you reach the maximun highest temperature goal that you have in mind. And when that doesn't help, then come fans to help reach whatever highest temperature it is you want it to be at.

What do you mean it "doesn't help"?