Re: Cooling questions: Dang, wrong twice in one week!

From: david zavetsky (
Date: Fri Jun 05 1998 - 17:28:30 EDT

Physics and everhing else aside.....

I stuck a 180 degree stat in my 5.2 (92) and the temp gauge runs alot
cooler...The engine doesnt ping (MP perf SBEC) like it used to....

If the stat regulates flow by using the temp of the coolant, then it seems
to me that the only thing that would cause a cooler therm. to overheat and
engine is a defective stat.....

I understand all that flow stuff for the most part, but if the coolant temp
is what effects the stat opening and closing,,,,,,,,,,,,,,,,,anyways, it
works for me.

I like the 180 degree stat...

Maybe my Dak is going against the laws of physics...

(Of course, no one can believe that a boxy, heavy, TALL 4x4 Dak can beat
aMustang, either.....

At 07:47 AM 6/5/98 +0000, you wrote:
>This was posted earlier in the week...
>> >Here is my 2 cents worth. I don't remember where I read this, but here
>> >it goes:
>> >
>> >When you change the thermostat to a lower temperature, you risk the
>> >possibility of overheating. I know, it is hard to believe. The
>> >explaination starts with temperature differental between ambient
>> >air and water temperature. The higher the differential between ambient air
>> >temperature and watter temperature, the more heat transfered from
>> >the coolant to the air. By lowering your coolant temperature to
>> >180, you are lowering the temperature differential by 15 degrees.
>> >This means you
>> >have to make up that 15 degrees in heat transfer somewhere else.
>> >
>> >I'm no expert, this is from a magazine I read.
>Yes, you are correct. After reading the email from my brother, you
>do indeed have to "make up" the heat transfer somewhere else. The
>difference is made up by moving more coolant through the radiator.
>I now understand the "possibility of overheating". If your 180
>stat won't open wide enough or if the radiator restricts the flow of
>coolant, then you will not be able to move enough coolant to remove
>a sufficient amount of heat from the engine. The coolant flow at 180
>degrees must be greater than the coolant flow at 195 degrees.
>To the original poster, I apologize for jumping on your message. I
>have now seen the light (heat?).
>This is the second time I've been wrong about a cooling question
>this week. I think I'll stick to computers and let the "experts"
>handle the heat transfer stuff. All of that college physics leaked
>out of my head a loooooooong time ago. :^)
>'97 Dak
"M ove O ver, P ickup A pproacing R apidly!"
1992 Dakota 4x4, Standard cab, short bed, 5.2 L V8, K&N, Gibson/Dynomax
exhaust,Power Puleys, MP SBEC, 180 degree thermostat, Bushwhackers,
tire/wheel package, Lund Moonvisor & Interceptor, Custom Cover tonneau,
Bundy rear bumper, chrome grillguard/pushbar

see for pictures!


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