Overheating...need advice - Team Camaro Tech
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post #1 of 16 (permalink) Old Jul 4th, 07, 11:11 AM Thread Starter
 
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Overheating...need advice

I have a supercharged small block 79 Camaro. The car originally ran a little hot (210deg) while doing slow driving and ran at 195deg while going a bit faster. I had two 10" electric fans with no shroud and a 160 stock thermostat. I replaced the thermostat with a Milodon hi-flow 160 and replaced the fan with a 16" electric with shroud. I also changed the upper and lower hose (yep no spring in that hose...what gives). After I fired the car up, it took about 10 to 15 minutes of normal driving to overheat the car (240deg). I got the car parked and let it cool for a while. After that, I did some testing and the first thing I noticed was that the lower hose seemed to be under pressure (not a ton of pressure, just pressurized), but I was expecting it to be sucking shut. After letting the car cool, I removed the cap from the rad and let it heat back to 200deg and noticed that the coolant wasn't really cycling through the system. I am considering replacing the thermostat (again). Can anyone give me some good advice on where to go next.

Thanks

Tom
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post #2 of 16 (permalink) Old Jul 4th, 07, 11:31 AM
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Re: Overheating...need advice

You answered your own question kinda. You know what is possibly going on you just are a little stumped. Make sure stat is installed correctly, and that the lower rad hose isn't plugged. Verify correct rotation of water pump/correct rotation style pump. They have reverse rotation pumps.

I would drain it, pull the stat, inspect the hose, blow thru the rad, run water thru the rad, run water bacwards thru the stat outlet flange,leave the stat hsg off, slowly fill the system until I had water at the stat, pull the belt and manually spin the pump to flow check, put the stat/top hose and fill full, run with cap off and check for flow.

Hope that helps. It's what I'd do if I walked into it cold anyway with your symptoms. Easy to do.

Tim Smith
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post #3 of 16 (permalink) Old Jul 4th, 07, 01:27 PM
 
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Re: Overheating...need advice

how does the radiator core look? do you see any corrosion when you take the radiator cap off and look at the tubes? after you check the other things as stated previously mentioned, check these.
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post #4 of 16 (permalink) Old Jul 4th, 07, 01:44 PM Thread Starter
 
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Re: Overheating...need advice

Thanks for the good ideas, The water pump is a high volume (at least that is what they said) stock replacement and to be honest, I have really never even though about the direction of the flow it produces, but I will check that. When I replaced the parts I mentioned in my original post, I also had the rad pressure checked cleaned and fins straigtened (it is a three core stock rad, copper). As an additional note, the new fan really creates quite a draw through the rad, more-so than ever before. Hopefully, in a few hours I will have an answer to the problem. I just purchased a new 180deg thermostat which I will check first (I didn't check the last one...I know, bad move). Once again thanks and I will post back soon.
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post #5 of 16 (permalink) Old Jul 4th, 07, 03:40 PM
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Re: Overheating...need advice

210 degrees is quite hot IMO.im betting you have a radiator blockage or undersized radiator.
or your fan isnt pulling air through the radiator properly.
also if your timing is to far retarded itll heat the motor up bigtime.
(probly the best thing to look at first. cuz supercharged motors run with a bit of retard)


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post #6 of 16 (permalink) Old Jul 5th, 07, 07:08 PM Thread Starter
 
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Re: Overheating...need advice

I changed out the thermostat from the 160deg to a 180deg with no real change in operating temperature. So according to the previous post, I started messing with the timing. I checked the timing at 1100RPM and it was at 0-BTDC. I think that is way too retarded for this engine, but I am not sure of where it should be. However, when I advanced the timing to 6-BTDC, the temp didn't seem to get as hot as before. I was getting readings around 195 to 210 while driving for about 10 minutes which is a whole lot lower then the 240 I was seeing. I would like to know where would be a good place to start as far as timing goes, I was thinking around 12 to 15, but I am unsure. Any help would be appreciated.

TIA

Tom
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post #7 of 16 (permalink) Old Jul 6th, 07, 03:55 AM
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Re: Overheating...need advice

you need to look up kustomwerker Mike. He's a blower guy, and can tell you what timing he runs on his blower motor.

What CR and blower do you have?

Tim Smith
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post #8 of 16 (permalink) Old Jul 6th, 07, 04:49 AM
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Re: Overheating...need advice

yeah I seen it before thats why I said to advance your timing cuz blower motors like lots of retard which will cause motors to run hot.
you might invest in an boost timing ignition box.
will keep the engine running alot cooler.
http://store.summitracing.com/partde...5&autoview=sku


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post #9 of 16 (permalink) Old Jul 6th, 07, 05:16 AM
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Re: Overheating...need advice

dawg Harry, that's sure a pretty Camaro!

Are you a blower guy too? I would love to do a blower motor someday.

Tim Smith
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post #10 of 16 (permalink) Old Jul 7th, 07, 02:03 PM
 
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Re: Overheating...need advice

I agree - sounds like an undersized or clogged radiator. Had the same issues & changed EVERYTHING because I "knew" that my 8 year old 4 core radiator was fine since I had always kept the antifreeze fresh and rust inhibitor in it since new.
I learned the hard way that the water jackets on non daily run engines produce rust flakes that'll mess up even a properly maintained radiator.
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post #11 of 16 (permalink) Old Jul 7th, 07, 08:09 PM Thread Starter
 
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Re: Overheating...need advice

Well, I set the timing to about 22deg at 1100RPM and it does make a difference, not enough though. I am going to change out the water pump and the rad, any suggestions?
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post #12 of 16 (permalink) Old Jul 7th, 07, 08:51 PM
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Re: Overheating...need advice

Quote:
Originally Posted by tsolomon View Post
Well, I set the timing to about 22deg at 1100RPM and it does make a difference, not enough though. I am going to change out the water pump and the rad, any suggestions?
heres a link to a replacement rad

http://www.chevellecooling.com/44.ht...2oQlLR&sm=2764

here to help with cooling solutions
Don
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post #13 of 16 (permalink) Old Jul 12th, 07, 06:54 PM Thread Starter
 
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Re: Overheating...need advice

Thanks, I just got the radiator today and it looks great, I also like the fact that it exactly matches the original. I also installed a Flow Kooler waterpump. hopefully this weekend I can finish and test the car out.
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post #14 of 16 (permalink) Old Jul 15th, 07, 07:04 AM Thread Starter
 
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Re: Overheating...need advice

Installed the radiator and water pump. First of all, I like the Alumitech radiator because it EXACTLY matched my current copper/brass version and since I had spent some time working on custom fitting a shroud, the new radiator accepted the shroud without changing anything. After installing the radiator, I filled it, and burped it. then ran the car down the road. The car never got above 190. At idle, I let it sit there for about a half hour, it got to around 200. So IMHO I believe I have success. Thanks for all your help. Here is a synopsys in order:
1st - 2 Hayden 10" fans no shroud -> 1 16" Summit fan with shroud.
2nd - 160 deg stock thermostat -> 1 180 deg heavy duty thermostat.
3rd - Stock water pump -> Flow Kooler High Flow water pump.
4th - 3 core copper/brass radiator -> 2 core 1" tube Alumitech radiator.
Original temp @220 - 240 -> Now @190 - 200.

Once again THANKS TO ALL
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post #15 of 16 (permalink) Old Jul 15th, 07, 10:33 AM
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Re: Overheating...need advice

gee at 200 degrees i would still be concerned.
one hot day and there goes a head gasket.
190 would be as hot as i would go IMO.
ever thing of putting a fan shroud on?


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