Hot Big Block - Team Camaro Tech
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post #1 of 24 (permalink) Old Mar 12th, 20, 04:52 PM Thread Starter
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Hot Big Block

My car is running great with the new EFI system but I continue to have a problem with it getting hot at idle. Took it out last weekend. It was about 70 degrees. While driving it was running at about 180 degrees. I stopped at the Jack in the box for some bacon cheddar potato wedges and while waiting it went up to 204. By the time I got home it had went down to 194. I have an Entropy aluminum radiator with a stock shroud and a 7 blade clutch fan itís about 2 inches from the radiator. I was thinking about getting a bigger spacer to get the fan closer. If that doesnít work, I might add an electric push fan. Any advice and or ideas would be appreciated.
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post #2 of 24 (permalink) Old Mar 12th, 20, 05:13 PM
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Re: Hot Big Block

Did it run hot before EFI?
What's the timing set at idle?

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post #3 of 24 (permalink) Old Mar 12th, 20, 05:13 PM
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Re: Hot Big Block

Is it a HD clutch fan? It looks about right for depth. Thermostat? And where is the temp sensor mounted?

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post #4 of 24 (permalink) Old Mar 12th, 20, 05:15 PM
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Re: Hot Big Block

From the picture it looks like the fan and shroud do not match. I mean the fan looks like it is a lot smaller than the shroud. I don't think you want it any closer to the radiator. That said I really don't think 204* is a big deal. I don't know about big blocks but my 302 doesn't like to run below 200*.

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post #5 of 24 (permalink) Old Mar 12th, 20, 05:29 PM Thread Starter
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Re: Hot Big Block

Temperature wise, it ran the same before the EFI. Timing at idle is set at 15 degrees btdc. Sensor is mounted on the intake.

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post #6 of 24 (permalink) Old Mar 12th, 20, 05:54 PM
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Re: Hot Big Block

My 396 does not have any temperature issues with roughly the same fan set up. The difference is the radiator. I looked up Entropy and they show their two row radiators are 1" tubes. Mine is a Griffin and it has 2 rows, but I have 1.25" tubes. Could be just enough to make your environment. Since my 1.25" tubes make the radiator thicker, it moves the radiator closer to the fan without adjusting your fan location. My clutch is 1/4-1/2" from the radiator-pretty close.


P.S; Milt! how is your EFI working? I am installing EFI on mine now. I am excited.

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Last edited by Brettallen59; Mar 12th, 20 at 05:56 PM. Reason: edit
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post #7 of 24 (permalink) Old Mar 12th, 20, 06:07 PM
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Re: Hot Big Block

How old is the clutch? Might be worth replacing or rebuilding. It might not be fully locking up and it runs cooler driving because you are forcing air through the radiator.
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post #8 of 24 (permalink) Old Mar 12th, 20, 06:24 PM Thread Starter
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Re: Hot Big Block

Quote:
Originally Posted by Brettallen59 View Post
My 396 does not have any temperature issues with roughly the same fan set up. The difference is the radiator. I looked up Entropy and they show their two row radiators are 1" tubes. Mine is a Griffin and it has 2 rows, but I have 1.25" tubes. Could be just enough to make your environment. Since my 1.25" tubes make the radiator thicker, it moves the radiator closer to the fan without adjusting your fan location. My clutch is 1/4-1/2" from the radiator-pretty close.


P.S; Milt! how is your EFI working? I am installing EFI on mine now. I am excited.

Brett.....

My fan is about 2 inches from the radiator. Perhaps a thicker spacer will do the trick.
EFI is working great, very responsive, but it was a hassle to get it all dialed in. I have a long thread detailing the whole process.

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post #9 of 24 (permalink) Old Mar 12th, 20, 06:25 PM Thread Starter
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Re: Hot Big Block

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How old is the clutch? Might be worth replacing or rebuilding. It might not be fully locking up and it runs cooler driving because you are forcing air through the radiator.
Clutch is relative new, very low miles on it.

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post #10 of 24 (permalink) Old Mar 12th, 20, 07:29 PM
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Re: Hot Big Block

Quote:
Originally Posted by Milt's 68 SS/RS 396 View Post
My fan is about 2 inches from the radiator. Perhaps a thicker spacer will do the trick.
EFI is working great, very responsive, but it was a hassle to get it all dialed in. I have a long thread detailing the whole process.
Yes, that's why I asked. I followed the entire journey and really was hoping you would eventually like the EFI conversion. Was a real test for you tho.

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post #11 of 24 (permalink) Old Mar 13th, 20, 04:27 AM
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Re: Hot Big Block

Car is not running Hot. They came with a 195* thermostat from the factory.
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post #12 of 24 (permalink) Old Mar 13th, 20, 04:46 AM
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Re: Hot Big Block

Quote:
Originally Posted by jkuro View Post
Car is not running Hot. They came with a 195* thermostat from the factory.
Depends on what he has for a thermostat to say it's not running hot. If he's running a 165, then it's running hot. If he's running a 195 then I might agree with you.
With an aluminum radiator, my temp never varies once it gets up to operating temp. I could be sitting for a 1/2 hour in the summer and it stays where it should. I doubt it has to do with getting the fan closer to the radiator.

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post #13 of 24 (permalink) Old Mar 13th, 20, 04:51 AM
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Re: Hot Big Block

Quote:
Originally Posted by Milt's 68 SS/RS 396 View Post
Clutch is relative new, very low miles on it.

Was there anything wrong with the old clutch? Was the engine temp the same and did it act the same?

What did you replace the clutch with? A Derale or a Hayden?

Was the old clutch the same distance from the radiator as what you have now?
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post #14 of 24 (permalink) Old Mar 13th, 20, 11:17 AM
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Re: Hot Big Block

Fan should be half in/out of the shroud. Distance from radiator has no effect. Some cars have very deep shrouds due to car construction and they have no cooling issues. Idle cooling temp will be lower if vacuum advance is hooked to full manifold vacuum and not ported.

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post #15 of 24 (permalink) Old Mar 13th, 20, 01:55 PM
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Re: Hot Big Block

you have at least an airflow problem.
1. shroud is not a good match to that radiator
2. fan looks a little small for that opening
3. Clutch could be inadequate
4. Entropy radiator is dual 1" tubes. Many times a big block wants more volume to keep temps down. A bigger radiator will definitely help.
5. EFI systems seem to breed hot running vehicles. I honestly can't say why but it's amazing how often I hear this issue.

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