With the Summer months and Heat in full effect, How hot is too hot?

[blown88coupe]

Low at 181 and high I think its at 190

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[blown88coupe]

OK. Need some help. Replaced the resistor with the updated one and when I tried it the coil was glowing when I turned the AC on.

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[DiMora]

I have heard differently from quite a few sources as far as the physics go if the fluid is moving at the same max rate all the time it doesnt pull out as much heat as it goes through the system...

There is no such thing as moving the fluid too fast through the system.

Physics does not support that argument.

The variables are the delta-T of your heat exchanger (radiator), which is a function of its design (size, fins, thickness, etc), the speed and temp of the air that moves though the heat exchanger (ambient air temp, fans), the fluid capacity inside the system (reservoir tank, total system capacity), and the SPEED that the fluid moves inside the system (bigger water pumps, fitting sizes, bends, etc - limited by most restrictive element in system). Moving the fluid FASTER cycles it through the heat exchanger more times (greater quantity of fluid cooled) in a given time period - which increases cooling.

 

[Department Of Boost]

It’s a hot day out. There you are sitting on your couch watching TV. You have a fan pointed at you. What fan speed cools you better, fast or slow?

Heat transfer 101

 

[702GT]

There is no such thing as moving the fluid too fast through the system.

Physics does not support that argument.

The variables are the delta-T of your heat exchanger (radiator), which is a function of its design (size, fins, thickness, etc), the speed and temp of the air that moves though the heat exchanger (ambient air temp, fans), the fluid capacity inside the system (reservoir tank, total system capacity), and the SPEED that the fluid moves inside the system (bigger water pumps, fitting sizes, bends, etc - limited by most restrictive element in system). Moving the fluid FASTER cycles it through the heat exchanger more times (greater quantity of fluid cooled) in a given time period - which increases cooling.

This is all true assuming the efficiency to do the job is there. If your radiation unit and fan aren't able to remove at least as much heat as the engine adds to it, you will end up deadlocked in a heat soak. In a closed system where the ammount of coolant is constant, faster moving fluid isn't always better.

Fan over your skin at speed is a terrible example. Evaporation, Convection, and Radiation are human comfort controls. If you are hot, your body will sweat. Blow 110 degree air over your skin and as long as you can continue to sweat, it will feel more comfortable, not really cooler. If you don't sweat, that fan at high speed is going to feel like a blow torch.

Cars don't care about comfort.

Seems to be alot of experts on the matters of fluid/thermal dynamics. The biggest thing I remember about closed system hydronics is; as the velocity of a medium increases, the btu carrying capacity of that medium decreases. Just because something works doesn't mean it's right either.

 

[DiMora]

This is all true assuming the efficiency to do the job is there. If your radiation unit and fan aren't able to remove at least as much heat as the engine adds to it, you will end up deadlocked in a heat soak. In a closed system where the ammount of coolant is constant, faster moving fluid isn't always better.

Fan over your skin at speed is a terrible example. Evaporation, Convection, and Radiation are human comfort controls. If you are hot, your body will sweat. Blow 110 degree air over your skin and as long as you can continue to sweat, it will feel more comfortable, not really cooler. If you don't sweat, that fan at high speed is going to feel like a blow torch.

Cars don't care about comfort.

Seems to be alot of experts on the matters of fluid/thermal dynamics. The biggest thing I remember about closed system hydronics is; as the velocity of a medium increases, the btu carrying capacity of that medium decreases. Just because something works doesn't mean it's right either.

Yes, there are a lot of experts. The guy who taught me about this is an aerospace engineer. Ever doubtful, I have upgraded my own system, and I have seen positive results as I have increased coolant flow speed.

Explain this:

Question One: Why, in a given system (Let's say a KB supercharger with a stock KB intercooler, an AFCO dual fan heat exchanger, and an aftermarket Canton battery -box mountet reservoir) does the IAT drop (as does recovery time after a run) when one replaces the stock Bosch coolant pump with a 20 GPM Mezeire pump?

Question Two: Why do IAT's drop even more (and recovery time does to) when one replaces the 20 GPM Mezeire with a 55 GPM Mezeire.

Bonus question: Why does the Ford GT500 Cobrajet drag car use a 55 GPM Mezeire intercooler pump?