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Old 05-14-2004, 11:50 PM
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thermostats

does a higher degree thermostat make the enigne run cooler or hoter? thanks

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Old 05-15-2004, 12:09 AM
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Hotter. But there`s a few factors in there also.
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Old 05-15-2004, 12:10 AM
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ah crap so i shouldnt of bought a 180degree one... i want it to run cooler
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Old 05-15-2004, 02:09 AM
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You want 180 degrees? Then buy a 180 thermostat.
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Old 05-15-2004, 02:12 AM
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Quote:
Originally posted by Ktaves1971
You want 180 degrees? Then buy a 180 thermostat.
i did buy a 180 thermostat

this is my summer car so the heat that the heater puts out i dont really care other then a cold day would be nice to get some heat so the windows dont fog up on me. so i wanted a thermostat that keeeps the engine cooler.
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Old 05-15-2004, 02:18 AM
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Sorry dude, I missread your earlier post. I thought you said I SHOULD have bought a 180.
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Old 05-15-2004, 02:19 AM
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ah i see, no worries
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Old 05-15-2004, 07:50 AM
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I run a 160 in my 350sb in the summer,and a 180 in the winter,and i also by-pass my heater so no heat will come in to the car.
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Old 05-15-2004, 08:15 AM
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Running a 180 can let your car run cooler than a 160 stat at times.
The reason is it allows the water in the radiator more time to cool before the next batch is ran through.

I have seen the "160" stats make a car run hotter as it dident allow time for the water to be cooled off in the radiator but instead just kept on flowing.
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Old 05-15-2004, 08:35 AM
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Quote:
I have seen the "160" stats make a car run hotter as it dident allow time for the water to be cooled off in the radiator but instead just kept on flowing.

That's ridiculous. The only difference between the 160 and 180 thermostat is the temp at which they open and begin flowing coolant to the radiator. By that logic it would overheat when the 180 thermostat opened also. Furthermore, if it where true, what is the physical difference in the two thermostats that alters the flow rate?
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Old 05-15-2004, 09:32 AM
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I have been running a 160 t-stat during the summer now for about 2 years,and it reaches 95 degrees alot here in ga,and the hottest it has ever ran with the 160 in at a stop light on a hot-hot day is around 170-175, now with a 180 in,it will run close to 190-195, even hotter if i have a long light..
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Old 05-15-2004, 10:29 AM
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I agree a 180* stat is the best choice for 99% of the street cars. As Robbie mentioned his car runs 170-175 with a 160 stat, that is too cool for making power and for getting the contaminants out of the oil. With a 180 his car runs in the 190-195 range that is better for power and more efficient. This will keep the oil cleaner as well. From what I have studied/understand 200-210 is the optimum range for efficiency. Look at all the newer cars they all run right at 210-220 (a little warm for me when it comes to muscle cars/hot rods), but, the reason they do that is for better mileage and cleaner emissions.

I run a 180* stat in my car and it still doesn't get over 200-205 no matter how long I sit still or how hot is is out side. It is usually right at 195*. I also take my temp. reading at the cylinder head so it is ~5-10* warmer than where the stat is.

You don't want your car to run right at the temp of the stat, you need the operating temperature to be slightly higher than the rating on the stat. So if you run a 180 you don't want the engine temp to be right at 180, you want it to be about 190. You don't want the engine to heat cycle (stat opening and closing all the time). Once the stat is open (given the same design/type) then it should flow the same, no matter if it is a 160 or 180.

Royce
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Old 05-15-2004, 01:00 PM
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I was told that the higher the pressure on the cooling system the higher the temp before it would boil. I know the newer car have a pressure cap that is 17 to 19 pounds, where the older car (60's) had a 12 to 15 pound cap. If 12 to 15 lbs. boils at 212, where would 17 to 19 boil.
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Old 05-15-2004, 01:15 PM
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The boiling point goes up about 3 degrees F for every 1 psi increase.

Assuming pure water (not good for you coolant system), it boils at 212 degrees F to an open atmosphere. So... a 10 psi cap will raise the boiling point to approximately 242 degrees F. A 15 psi cap = 257 degrees F and an 18 psi cap would take it to approximately 266 degrees F.

A 50/50 coolant mix would increase all of these temperatures by approximately 10 degrees F.
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