Re: Cooling issue
[Re: Hemi_Joel]
#3132937
03/28/23 09:21 AM
03/28/23 09:21 AM
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Joined: Jan 2003
Posts: 75,050 U.S.S.A.
JohnRR
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I agree airflow is a likely culprit with the circumstance you describe. But not for certain:
If it has an automatic trans, the heat generated from the converter due to the high idle of a cammed up engine and/or a loose converter can cause the coolant temp to rise from the trans cooler in the radiator. I recommend testing by installing a remote trans cooler and disconnecting the one in the radiator. Or you can drive in traffic and keep popping it into neutral when you are on the brakes to reduce heat from the trans and see if that helps.
Also, what is your timing at idle and off idle, at the RPM that the overheating occurs? It should be at least 20, preferably more, and if you have a operating vacuum advance hooked up to manifold vacuum, that helps too. This ... auto trans ?? If so what is your convertor stall ? Where is your trans cooler , and do you have an auxiliary cooler also , factory hemi /auto trans cars did . Also you said 35 total , is that what it runs best at ? I've been watching a lot of auto related tech these days and the 2nd gen hemis are said to not need as much total as a wedge headed engine ???
running up my post count some more .
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Re: Cooling issue
[Re: terzmo]
#3133007
03/28/23 01:28 PM
03/28/23 01:28 PM
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Joined: Jan 2004
Posts: 3,001 Coram, NY
Pool Fixer
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master
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Posts: 3,001
Coram, NY
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I don't doubt for a second that you have a coolling problem as it's creeping up and not stopping- I'm not sure why anyone is telling you 200/205 is ok when it's still climbing. sounds like 200/205 just happens to be the point where you have had enough and stop the madness, not a steady running temp for long periods.
However, it's probably worth looking into if your gauge is correct. Clearly it's accurate enough to tell you that a cooling issue exists but as you embark on the journey of thermostats/fans, etc, it's worth having an accurate reading as you will be comparing engine temps to thermostat open temps vs. size of fans and rads. The temp data point should be as accurate as possible.
the factory gauge in my 68 charger decided to be 30 degrees off after sitting for a loooonnngggg time. A gauge I calibrated many moons ago and I know it was correct back then as 230 and climbing triggered my car's gag reflex and she'd spew all over the ground. Old mechanical gauges, old wiring, old mechanical 5v limiter- old cars, man
I've been down this road with a mild big block in my charger. I believe I have finally solved it with high flow 160 thermostat, a very large fluidyne radiator, opened up core support, dual 1300cfm spal fans, flow kooler waterpump. I'm running a sniper efi that controls the fans individually. It will idle at rock steady 168-170 on just one fan with mid 50s ambient. the proof will be in the pudding soon enough.
many years ago before I ran this setup I ran a be cool direct fit which seemed like a joke to me. this was before the web was a good resource and I picked it out of the summitt catalog. very small rad. best results I ever had with that was no clutch, ghetto flex fan, and a cobbled together shroud.
You know who I am
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Re: Cooling issue
[Re: terzmo]
#3133213
03/29/23 09:45 AM
03/29/23 09:45 AM
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Joined: Jan 2003
Posts: 75,050 U.S.S.A.
JohnRR
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I Win
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Runs well at timming submitted. No external trans cooler. Mild converter 2800-3200 stall. I ordered the flow cool pump and high flow thermostat. Who, and how , was that timing spec figured out ?
running up my post count some more .
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Re: Cooling issue
[Re: terzmo]
#3133232
03/29/23 10:29 AM
03/29/23 10:29 AM
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Joined: Jan 2004
Posts: 3,001 Coram, NY
Pool Fixer
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Posts: 3,001
Coram, NY
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Runs well at timming submitted. No external trans cooler. Mild converter 2800-3200 stall. I ordered the flow cool pump and high flow thermostat. The flowkooler is for sure very different than a stock style pump. Many more smaller straight vanes on it. I chose it because I'm running a serpentine setup that turns the water pump in opposite direction than stock. if you end going with electric fans, be careful what you choose. Seems like the CFM ratings they claim are optimistic at best. for example, I run spal 12" fans. rated at 1360cfm each. draws 18 amps. Derale makes a 12" 2000 cfm fan that draws 24 amps. then you go look at some other 12" fans that ive never heard of before.... they claim to move 2000 cfm and draw 9 amps? Even if they had some miracle design, I can't see them outflowing mine by 68% at 50% less amp draw... at 40% of the price to boot! come on!
Last edited by Pool Fixer; 03/29/23 10:55 AM.
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Re: Cooling issue
[Re: stumpy]
#3133295
03/29/23 01:26 PM
03/29/23 01:26 PM
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Joined: Sep 2003
Posts: 19,480 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,480
north of coder
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of all the electric fans out there, i choose OEM units every time. they are super reliable, pull fantastic air, and are relatively easy to wire up. choose one that fits your radiator size, and make sure your wiring system is up to the task and in perfect condition. don't be afraid to look at all makes and models to choose a fan setup. just my opinion. your mileage will vary.
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Re: Cooling issue
[Re: Pool Fixer]
#3133398
03/29/23 04:51 PM
03/29/23 04:51 PM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
OP
top fuel
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OP
top fuel
Joined: Mar 2005
Posts: 2,060
Pendleton NY
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Runs well at timming submitted. No external trans cooler. Mild converter 2800-3200 stall. I ordered the flow cool pump and high flow thermostat. The flowkooler is for sure very different than a stock style pump. Many more smaller straight vanes on it. I chose it because I'm running a serpentine setup that turns the water pump in opposite direction than stock. if you end going with electric fans, be careful what you choose. Seems like the CFM ratings they claim are optimistic at best. for example, I run spal 12" fans. rated at 1360cfm each. draws 18 amps. Derale makes a 12" 2000 cfm fan that draws 24 amps. then you go look at some other 12" fans that ive never heard of before.... they claim to move 2000 cfm and draw 9 amps? Even if they had some miracle design, I can't see them outflowing mine by 68% at 50% less amp draw... at 40% of the price to boot! come on! Yes
Last edited by terzmo; 06/26/23 07:47 AM.
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Re: Cooling issue
[Re: terzmo]
#3133405
03/29/23 05:08 PM
03/29/23 05:08 PM
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Joined: Jan 2003
Posts: 32,947 Grand Prairie,Texas
stumpy
I Win
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I Win
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Posts: 32,947
Grand Prairie,Texas
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If it was running well at that timing it wouldn't be over heating. So timing is the absolute cure all answer. Hell then I guess a rad or fan or water pump are extras that are not needed as timing is the answer. Volkswagon had it right. It's free and only takes a couple of minutes. Why not try it it can't hurt and you may be surprised. Instead of telling evrybody they're wrong and being sarcastic about it.
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Re: Cooling issue
[Re: terzmo]
#3133406
03/29/23 05:09 PM
03/29/23 05:09 PM
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Joined: Jan 2003
Posts: 5,445 So Cal
Sinitro
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Posts: 5,445
So Cal
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Note that for fans, there are (2) spec for current draw.. 1 is for the Turn-on surge and 1 is for continuous running. 1 thing to keep in mind is the total current draw which often very high that many don't realize the overall battery/electrical system drain. Just my $0.02...
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Re: Cooling issue
[Re: terzmo]
#3133525
03/29/23 11:54 PM
03/29/23 11:54 PM
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Joined: Feb 2003
Posts: 10,218 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
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If it was running well at that timing it wouldn't be over heating. So timing is the absolute cure all answer. Hell then I guess a rad or fan or water pump are extras that are not needed as timing is the answer. Volkswagon had it right. Sounds like you should be telling us how to cool your car down. Could make for an entertaining thread…
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Re: Cooling issue
[Re: Sniper]
#3134792
04/03/23 02:46 PM
04/03/23 02:46 PM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
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OP
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Don't you just love guys that have all the answers but can't figure out their problem.
The OP has spent more time on here telling us we are wrong that it would have taken to just check and report back useful data rather than snarky crap.
I say let Mr. Knowitall figure it out on his own, Don't you just love guys who contribute nothing but take up space. This is a non productive argumentative post that I had hoped to avoid. Reported to administrators but I guess it's there forum, their choice. I got some great suggestions and thanks to those that submitted them. I'm done with this here because of two legged rectums.
Last edited by terzmo; 04/03/23 02:49 PM.
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Re: Cooling issue
[Re: terzmo]
#3134943
04/04/23 12:04 AM
04/04/23 12:04 AM
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Joined: Feb 2003
Posts: 10,218 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,218
Someplace you aren't
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Don't you just love guys that have all the answers but can't figure out their problem.
The OP has spent more time on here telling us we are wrong that it would have taken to just check and report back useful data rather than snarky crap.
I say let Mr. Knowitall figure it out on his own, Don't you just love guys who contribute nothing but take up space. This is a non productive argumentative post that I had hoped to avoid. Reported to administrators but I guess it's their forum, their choice. I got some great suggestions and thanks to those that submitted them. I'm done with this here because of two legged rectums. Damn
I want my fair share
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