How hot is to hot??? - Team Camaro Tech
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post #1 of 8 (permalink) Old Jun 22nd, 01, 05:08 AM Thread Starter
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Join Date: Apr 2001
Location: Houston,TX
Posts: 138

I have read all the cooling system posts. The only thing I am missing is the clutch fan (The previous owner put the dreaded Flexilite on). I have a good shroud, and have sealed the top and bottom of radiator/frame gaps to ensure air comes through the right way. Car used to run right at about 190 stopped/180 moving, but I just got the A/C fixed and with hot Houston weather (90++) it runs about 200/210. When stopped for extended times (more than normal stop light) with A/C on it got up to about 220. I shut the A/C off and temp came back down to about 210. I am going to move from 50/50 mix to 25/75 this weekend and clutch/ stiff fan ASAP. The question is, and keeping in mind the slight temp spike when you shut the engine down, as a worst case, at what point should you shut the engine down because you are risking damage???
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post #2 of 8 (permalink) Old Jun 22nd, 01, 05:16 AM
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Location: Meridian, Idaho
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I have had better experience using the clutch fan. The flex ones never really worked for me in hot weather days.
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post #3 of 8 (permalink) Old Jun 23rd, 01, 08:57 PM
Join Date: Feb 2001
Location: DAYTON IN 47941
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I would go with the clutch fan to.but those temps are fine
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post #4 of 8 (permalink) Old Jun 24th, 01, 02:10 AM
Join Date: Apr 2001
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In many applications, GM did not turn the electric fans on until 240. I would recommend that as a maximum. Ray
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post #5 of 8 (permalink) Old Jun 24th, 01, 09:24 AM Thread Starter
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Location: Houston,TX
Posts: 138

I'm still running the cast iron heads which are suppose to be more heat forgiving than the aluminum. I just talked to a guy today that said upwards of 230 he would shut it down. I am definately going to switch it back to the clutch/fan set up ASAP.
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post #6 of 8 (permalink) Old Jun 25th, 01, 10:00 AM
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Join Date: Apr 1999
Location: Newbury Park, CA
Posts: 2,714

When you say 25/75 mixutre I hope you mean 75% water. There is no better heat transfer liquid than water so if you mix it too rich with antifreeze you lose a lot of heat transfer and storage capability. The higher boiling point will not do any good if the heat cannot be transfered.

The clutch fan setup is far superior to any fixed-fan.

The Red Beast

[This message has been edited by CarlC (edited 06-25-2001).]
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post #7 of 8 (permalink) Old Jun 25th, 01, 02:55 PM
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Join Date: Jan 2001
Location: SLC, UT
Posts: 41
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Now I am confused. I thought that having a fixed fan would cool your engine better for cars that are mostly for cruising (below 50 MPH)? They may take a little power off the engine but would keep a hot engine cooler. I run a clutch fan myself but was just having this dispute with my brother-in-law who just ordered Edelbrock RPM heads for his 62' Nova Convertible. He was told by the Edelbrock guys to run a fixed fan and a high flow water pump. Hopefully somone will answer me quick before he puts them on his car!! I would like to save the guy some money and hassle.
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post #8 of 8 (permalink) Old Jun 25th, 01, 03:32 PM
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Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,529

A fixed (not flex) fan will rob you of HP once the car is moving. The fixed fan spins faster with RPMs. The air flow from the grill is usually enough when at speeds above about 30mph. A good clutch fan moves more air when the cooling is needed and not as much when it's not. 2 types though!! They look alike but don't work alike. The thermal clutch tightens up and the fan spins faster when the temp around it goes up. The non-thermal reacts to RPM so when you're idleing the fan is closest to being locked (acts like a fixed) and at high RPM it slips more. Ultimatly you get more cooling from a thermal but the non-thermal uses less HP. I'm running a non-thermal and am going to order a thermal to help the hot long hot sit in traffic that goes on during summer around here...

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