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10-05-2017, 06:08 PM | #1 |
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Another cooling question
I have a strange question. Does anyone know how much of a difference air temperature makes on engine temperature? My car was running hot on a 80 degree day (and a bunch of other days). I rechecked the timing, added two bottles of Redline water wetter, and changed the thermostats to 160's. Today I took the same route as before and my car ran much cooler, last time it maxed out at over 200, today 180. The air temp was in the low 60's. Just wondering if I fixed the problem or if it was the air temperature.
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10-05-2017, 06:23 PM | #2 |
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Re: Another cooling question
Air temp. Thermostats have little to do with the maximum operating temperature. They help bring the engine up to operating temperature quicker and maintain a minimum temperature. If it was me, I would be running 180 deg thermostats. Either way you will still have to address any overheating issues. Not that it totally works this way, but you have a 20 deg deferential in outside temp and a 20 deg difference in engine operating temp.
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10-05-2017, 06:37 PM | #3 | |
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Re: Another cooling question
Quote:
If you are driving a 1939 to 1941, you have an air flow problem because the crank mounted fan is low, and does not turn as fast as a pulley driven fan, which mostly run at 1.2 to 1.3 times crank speed. |
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10-05-2017, 06:42 PM | #4 |
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Re: Another cooling question
Air Temp makes a big difference. I've experienced that first hand.
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10-05-2017, 07:50 PM | #5 |
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Re: Another cooling question
An old rule of thumb was that the engine ran about 100 degrees above outside air temperature
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10-05-2017, 09:55 PM | #6 |
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Re: Another cooling question
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10-06-2017, 07:38 AM | #7 |
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Re: Another cooling question
The outside temp has a lot to do with engine temp as we
all know. I spent over 2 years doing all kinds of temp testing mostly in temps above 85 degrees. When having temp problems REMOVE thermostats, they only cause the engine to run hotter and have nothing to do with cooling. After the problem is solved then try the stats. Most stats restrict the coolant flow and will cause a hotter engine in hot weather, this will not be noticed in cooler weather. The air forced through the radiator from forward motion is what does most of the cooling. The wind also effects the cooling. One day on a straight road 3 miles long with the wind straight down the road from the North I was heading north into the wind and the engine temp was close 15 degrees cooler then is was heading South with the wind pushing the car. Don't forget the engine is working harder going into the wind yet it ran cooler. I repeated this into the wind test several times to verify the findings. This was posted on this forum at the time the tests were done. G.M.
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10-06-2017, 08:47 AM | #8 |
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Re: Another cooling question
Yes indeedy. Cooler ambient air helps. Winter driving proves it.
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10-06-2017, 09:42 AM | #9 |
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Join Date: Sep 2015
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Re: Another cooling question
At what ambient air temps do your cars overheat? This year, anything much over 80 deg. caused bad overheating and shutdown!. I'm frustrated because this almost precludes summer driving and I've done all I can think of to fix the problem.
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10-06-2017, 11:15 AM | #10 |
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Re: Another cooling question
For me anything over 80, especially on the highway or mountains.
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10-06-2017, 12:24 PM | #11 | |
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Re: Another cooling question
Quote:
it. If you have thermostats start by removing them. Fill the radiator up into the filler neck and look for compression bubbles in the coolant. G.M.
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10-06-2017, 01:21 PM | #12 |
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Re: Another cooling question
A All of the above and consider another row of tubes ,
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