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Old 06-07-2016, 01:00 PM   #1
30-9
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Default How hot is too hot

I know these flatty's like to run on warm/hot side. In traffic I see my temp hitting 190. Which I believe. Is ok. But at what point or temp should I say time to pull over and wait for cool down?
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Old 06-07-2016, 01:16 PM   #2
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Default Re: How hot is too hot

190 is great in traffic, as far as I'm concerned.

200-210 is getting real hot. Thing is, once you shut down it'll go up another 10 degrees without the pumps moving water.

Just my thoughts.
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Old 06-07-2016, 01:22 PM   #3
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Default Re: How hot is too hot

The manual says as long as it's not boiling.
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Old 06-07-2016, 02:34 PM   #4
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Default Re: How hot is too hot

Roughly...
Water boils @ 212
Antifreeze @ 265

265 degrees sounds a little high
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Old 06-07-2016, 02:52 PM   #5
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Default Re: How hot is too hot

Hi Everyone, Tinker, remember that 265 degree number includes a 15psi pressure cap. Unpressurized it's about 223. Add 3psi per one pound of pressure.
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Old 06-07-2016, 03:09 PM   #6
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Default Re: How hot is too hot

Very true Jeff.

Some more discussion on flathead temperature ...
https://www.fordbarn.com/forum/showth...3954&showall=1
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Old 06-07-2016, 07:42 PM   #7
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Default Re: How hot is too hot

Ok so if I'm reading this right, at 210 I should pull over and open hood. Logic is 210 + 10 rise after shut off = 220 danger zone - as my cars are no pressure caps.

That right?
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Old 06-07-2016, 07:57 PM   #8
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Default Re: How hot is too hot

Start by checking your gauge to be correct. Use a thermal gun to verify the gauge and go from there. I have seen lots of gauges to read much higher than true Temp.
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Old 06-07-2016, 08:39 PM   #9
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Default Re: How hot is too hot

Quote:
Originally Posted by Tinker View Post
Very true Jeff.

Some more discussion on flathead temperature ...
https://www.fordbarn.com/forum/showth...3954&showall=1
I just re-read that one again. It's a true classic on the subject.
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