Re: Overheating 484 Hemi - Need Ideas
[Re: rickraw]
#2924271
05/19/21 10:02 AM
05/19/21 10:02 AM
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Joined: Jul 2004
Posts: 1,145 Arizona, USA
gsmopar
super stock
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super stock
Joined: Jul 2004
Posts: 1,145
Arizona, USA
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The only thing is see is that plate on the rad holding the fans. That’s not a shroud. I tried that same thing on my old demon, ran hot with 4 puller fans. An engineer friend told me I needed a minimum of 3/4” deep shroud. I believe that plate is restricting air flow. Good eye! I went to check what I have and it's right about 3/4". Untitled by Greg Ault, on Flickr
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Re: Overheating 484 Hemi - Need Ideas
[Re: maximus]
#2924330
05/19/21 11:59 AM
05/19/21 11:59 AM
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Joined: Jan 2003
Posts: 18,025 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,025
S.E. Michigan
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If It was mine I would try removing the existing fan and mounting plate, install a belt driven fan and test. That alone should improve it, going down the road (but it will still heat up at low speeds due to the lack of a shroud).
I also used to use a pretty high antifreeze to water percentage (Michigan freeze protection) but went to 50/50 and noticed a slight improvement. I'd suggest that later as well unless you're dead set against it.
A deeper shroud as mentioned should also improve it at low speeds, but if you look for one, try to find one that allows an airflow path for situations where the car is moving 50+mph (as airflow through the grille from a car moving 50+mph is better than most any fan could provide). Many aftermarket E-fan/shroud combinations don't have those provisions, and the fan usually ends up running constantly at higher vehicle speeds when it shouldn't be needed. In fact the fans can move slower than the air coming in through the grille, and potentially block some airflow.
Once any improvement is found, then the crossroads question is usually whether to revert to a more OE setup with belt driven fan and custom shroud, or stay with electric and try to find a shroud with louvers or flaps that open at higher speeds and allow airflow.
Rich H.
Esse Quam Videri
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Re: Overheating 484 Hemi - Need Ideas
[Re: cudaman1969]
#2924429
05/19/21 02:13 PM
05/19/21 02:13 PM
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Joined: Jan 2003
Posts: 7,526 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,526
Minnesota
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Lots of those aftermarket electric fans don't move anywhere near the cfm they claim. Thats why a test with a belt driven, factory fan is in order.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Overheating 484 Hemi - Need Ideas
[Re: AndyF]
#2924473
05/19/21 03:31 PM
05/19/21 03:31 PM
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Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
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The symptoms you are describing, almost bet its fan related. Had nearly same issue with mine several years ago. Had a cheap, parts store fan on it and would heat up quickly on the street or the track. Bought a GOOD fan, immediately fixed the issue. By good, if a fan isn't pulling 20 amps or better, its motor isn't cutting the mustard. I have found Derale fans to be of excellent quality, and they are US made. Having them on a relay(s) is also a good idea
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Overheating 484 Hemi - Need Ideas
[Re: maximus]
#2924597
05/19/21 07:44 PM
05/19/21 07:44 PM
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Joined: Jan 2003
Posts: 12,814 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,814
Benton, IL.
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The Mercedes fan with Howie's controller is the absolute best electric fan set-up I have ever ran. Easily cooled my blown aluminum 505 Hemi in the Dart.
Master, again and still
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Re: Overheating 484 Hemi - Need Ideas
[Re: moparx]
#2925385
05/22/21 05:27 AM
05/22/21 05:27 AM
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Joined: Mar 2003
Posts: 1,629 pa
572charger
top fuel
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top fuel
Joined: Mar 2003
Posts: 1,629
pa
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TIMING TIMING TIMING IT WILL NEVER RUN COOL AT 28 29 DEGREES OF TIMING TOTAL my 610 cuin hemi will never run cool at 28 degrees itruns the best at the drag strip at 29 but on the street i run 35 degrees
606 hemi pump gas best 9.60 at 142mph on motor 05 hemi daytona 1500 go-mango 4wd quadcab 2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back
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Re: Overheating 484 Hemi - Need Ideas
[Re: 572charger]
#2925398
05/22/21 07:41 AM
05/22/21 07:41 AM
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Joined: Jun 2006
Posts: 5,173 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,173
CT
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Dump the straight antifreeze, it may have worked before on other stuff that wasn't putting as much heat into the coolant, (maybe blocks with less rust inside too, that weren't .060 over) but its thicker and doesnt dissipate heat the same. In fact I noticed my car runs 10-20 degrees cooler with straight water vs 50/50.
The fan mounting plate, as mentioned, might be an issue.
I would try a stock water pump and water pump housing if you have one and the fans/mounting plate don't make a difference.
More timing will help, some engines really run hot when you disconnect or don't run vacuum advance. I would expect that knocking it back to 28 made your problem worse.
Last edited by GTX MATT; 05/22/21 07:44 AM.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Overheating 484 Hemi - Need Ideas
[Re: maximus]
#2925430
05/22/21 09:56 AM
05/22/21 09:56 AM
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Joined: Jan 2003
Posts: 5,127 Chicago Blackhawks
hemicar1971
master
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master
Joined: Jan 2003
Posts: 5,127
Chicago Blackhawks
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I like at least three rows inside the radiator. The more time the coolant had sitting in the radiator the more it cools from one row to the next. One other thing I run a mated Water Pump Housing and Pump. There are a lot of differences between housing and pumps. NHOA did a study at one time and put it in there news letter on all the pumps and housings. I run a 160 high flow quick opening Stat. My set up is completely factory, 26 inch cooper rad, factory E Body completely but I do not run the clutch on the fan just the seven blade fan. I never run anything but a mixture of Anti Freeze and water like Chrysler does. 50/50. The Temp stays around 163 degrees temp taken of the pump. I don't think you want to go to what I have since you have spent money and time on making the cooling look a lot prettier than what I have. I believe you have tried all kinds of thing with the timing it can be a big contributor to a heating problem.
1971 HEMI E BODY REGISTRY
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Re: Overheating 484 Hemi - Need Ideas
[Re: hemicar1971]
#2925549
05/22/21 02:26 PM
05/22/21 02:26 PM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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like others have said, ditch the plate holding the fans. I would start there. I tried that once with puller fans and it wasn't a good result. Electric fans can work, just make sure they are high flow like a spal fan. Not the chinese no name ones.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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