I was wondering how the guy came to the conclusion that a cooling system was closed loop?????
Are you kidding me? It's a closed loop system because the coolant is recirculated continually in a closed loop. The puke tank has little or nothing to do with the cooling, it's basically an expansion tank.
but what if there is no puke tank?????
Then you will have a cooling system like the ones that came on the pre-1970's cars, just an overflow hose blowing the excess out on the ground. At some point there is sufficient air space in the radiator to allow for the expansion of the coolant without overflowing. Ethylene glycol isn't something you want to be blowing out on the ground if you can help it.
Seems to me he is saying that if I spend an equal amount of time outside at 95 degrees, versus an equal amount of time inside at 70 degrees I should not get hot. Seems to me the longer I stayed in the 70 degree climate the cooler I would stay.
Remember, for every amount of time you're inside cooling off at 70°, somebody else is roasting outside at 95°. You can't both be inside at the same time, and you have to stay outside longer also.
Let's say that your cooling system volume is equally divided between the radiator and the block, so that half the water is in the block heating up while the other half is in the radiator getting cool. Let's say that you have 4 gallons of coolant in the system and your water pump is pumping 20 gallons a minute. Using grade-school math we can surmise that the coolant will make a complete cycle through the system every 12 seconds, so that every minute the water spends 30 seconds in the radiator and 30 seconds in the block. If I double the flow to 40 gpm the water makes a loop every 6 seconds and still spends 30 seconds of every minute in the radiator and 30 seconds in the block. As you can see, the average amount of time the water spends in the radiator is the same no matter what the flow.
Also, if the hotter you make the radiator the more heat it transfers were true, wouldn't the drag racers during cool down when they run the water pump with the motor off be putting torches to the fins rather than cold water?
Let's get back on track here...you heat the radiator with the coolant, and cool it with air. Spraying cool water on the radiator works well because the specific heat of water is far greater than that of air.
Next time you're at the races, do an experiment. Get the engine uniformly hot, say 200° then shut it off. The first time you do this, run the electric fan continuously but only run the electric water pump 5 seconds of every minute. Keep track of the time necessary to cool the engine to 160°.
Next time start at 200° but run the fan and pump continuously until the engine is at 160°. I'll bet the cool-down time is far shorter than before.
It's interesting that people know that cooler air will extract more heat from a radiator than warm air but don't understand why. This is explained by Newtons Law of Cooling, which states:
"For a body cooling in a draft (i.e., by forced convection), the rate of heat loss is proportional to the difference in temperatures between the body and its surroundings." This means that increasing the difference in temperature between the hot water and cold air will result in greater heat loss. If the air temperature is held fixed and the coolant temperature is increased, the effect is the same as holding the coolant temperature constant and decreasing the temperature of the air. The equation looks like this:
How much did the installation of your restrictor affect the flow? Do you think there would be other effects also, like increased head pressure and more system turbulence?
call Be Cool or Griffin. They are the ones that pointed me in the direction of slowing down coolant flow.
From Be-Cool FAQ's:
7) Q. Should my water speed be decreased?
A. No! Avoid using underdrive engine pulleys which slow water speed.
29) Q. Any specific thermostat recommendations?
A. Yes. Use a high quality, high performance thermostat like Be Cool's 78000 series thermostats. These units increase water flow and guarantee proper function.
From Griffin FAQ's:
5. Thou shall use the proper water pump pulley ratio.
To obtain the maximum operating efficiency rate for your water pump at highway speeds, you should overdrive the pump by 30-35%. Check your pulley selection. Most after market pulleys are a 1:1 ratio. For a 30-35% overdrive, the crank pulley should be approximately 7 7/8” and the water pump pulley approximately 5 3/4”. This overdrive provides proper coolant flow from the engine and through the radiator.
