Re: Fan to radiator location what is optimal?
[Re: MidPenMopar]
#945783
03/08/11 01:57 PM
03/08/11 01:57 PM
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Joined: Jan 2003
Posts: 28,071 Irving, TX
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Senior Management
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Posts: 28,071
Irving, TX
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Stu, grab the fan that Scatpk offered. Find the stock style fan that fits the shroud the best. It'll do all you need. Chances are that flex fan is flattening out too much at idle and not pulling air. For most cars the stock style cooling fan works great.
Forget the pusher fan. It will restrict air flow on the highway. I ran an electric 18" pusher on the hot rod. The temps went up about 10 degrees on the highway with it running. The electric motor could not spin fast enough to keep up with 60 mph air. That turned it into a wind powered generator. With the pusher turned off the temps were still higher at speed than without the fan.
Your problem is air flow from the fan. Put the right fan on the car and it should fix it. Best of all, it'll be free (or a beer in exchange).
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Fan to radiator location what is optimal?
[Re: feets]
#945785
03/08/11 03:34 PM
03/08/11 03:34 PM
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Joined: Oct 2010
Posts: 606 Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
...............that fits the shroud the best............... Chances are that flex fan is flattening out too much.......
Yup
Also, all this talk---has been said several times.....
about THE FAN BEING AS CLOSE AS POSSIBLE to the radiator is nonsense. IT IS POSSIBLE that if the fan is too close it may be causing TURBULENCE and in fact is diminishing airflow. You can find examples of older GM and Fords "a few years back" where they used an INCREDIBLY LONG fan shroud and had the fan wayyyyyyyy back from the radiator.
Like whatever this fits:
http://www.enjukuracing.com/images/OEM%20Fan%20Shroud.jpg
A "huge" example:
http://carphotos.cardomain.com/ride_images/1/1776/1521/4438260011_large.jpg
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Re: Fan to radiator location what is optimal?
[Re: Yancy Derringer]
#945786
03/08/11 06:35 PM
03/08/11 06:35 PM
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Joined: Jan 2003
Posts: 28,071 Irving, TX
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Mopar used long fan shrouds too. Here's a 77 New Yorker. The shroud is somewhat long. The fan blades are visible in this image too. Notice they're nowhere near the radiator.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Fan to radiator location what is optimal?
[Re: Mopar_Country]
#945788
03/08/11 09:35 PM
03/08/11 09:35 PM
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Joined: Dec 2003
Posts: 36,840 South San Francisco, Californi...
MidPenMopar
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Well we sure got a lot of varing opinions on this question. I have been thinking about this all day and come to the concluesion since the engine temperture is fine even in the hottest weather when traveling at say 35 MPH+ and only goes up when there is no forced air flow at low speeds it must be lack of enough air being pulled though correct? I think i will first try moving the existing fan back a few inches and see what does? Also of note it takes a good fifteen minutes or at least 10 miles of travel to reach operating temps so if anything it may be running too cold at start up too.
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Re: Fan to radiator location what is optimal?
[Re: MidPenMopar]
#945789
03/08/11 11:03 PM
03/08/11 11:03 PM
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Joined: Jan 2003
Posts: 28,071 Irving, TX
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If you're going to pull the flex fan off, go ahead and put a stock style fan back on. They work.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Fan to radiator location what is optimal?
[Re: feets]
#945790
03/08/11 11:08 PM
03/08/11 11:08 PM
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Joined: Dec 2003
Posts: 36,840 South San Francisco, Californi...
MidPenMopar
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Quote:
If you're going to pull the flex fan off, go ahead and put a stock style fan back on. They work.
I'm going to try just moving it back a few inches and see if that helps at all??
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Re: Fan to radiator location what is optimal?
[Re: MidPenMopar]
#945791
03/08/11 11:31 PM
03/08/11 11:31 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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Marysville, O-H-I-O
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Stu, how "hot" is that 383 in your runner? I didn't hear it start up when I was there...I was under the impression that it was pretty stock though?
you should have no problems keeping that thing cool. look at all the high performance engines making 600 hp but driving around on the street just fine.
as others have said, your problem is definitely airflow related.
honestly, I think the key here is to move the fan further back from the radiator, so that the blades are half way in and half way out of the shroud.
And yes, flex fans are junk. they work great in theory, but not in reality. in theory, at low RPMs, they pull lots of air, but at higher RPM when you have more airflow, they flatten out from the air moving through them and thus, pull less hp away from the motor.
however, they're just junk. no matter what you do, mechanical on a clutch, electric, both...GET RID OF THE FLEXER!!!
I'm a fan (no pun intended) of electric fans, if your electrical system can handle it. when you're cruising down the highway, they are fully off, putting no load on your electrical system, or pulling hp from the engine. in town at traffic, they pull electrical load only. with a proper fan, shroud, and thermostat switch, it's as automatic as the one in your daughter's PT cruiser, you don't even have to think about it.
I'm running a 19" electric fan out of a Jeep, with a home made shroud, and my 383 stroker that's putting out 500-ish hp/tq, will sit in traffic at 170 degrees all day long...when the ambient air temps are in the 90s. and I'm using the stock radiator that came on my truck.
my fan shroud is about 20"x22" and holds the electric fan approx 2" away from the radiator--nothing fancy either, just a piece of sheet metal bent into a "box" on a sheet metal brake, and a hole cut in the middle to mount the fan.
**Photobucket sucks**
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Re: Fan to radiator location what is optimal?
[Re: DennisH ]
#945797
03/09/11 10:23 AM
03/09/11 10:23 AM
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Joined: Aug 2003
Posts: 4,481 Mesa, AZ
Pat_Whalen
super gas
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super gas
Joined: Aug 2003
Posts: 4,481
Mesa, AZ
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Quote:
Just say no to electric fans.
I'd love to hear the reason behind this...
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Re: Fan to radiator location what is optimal?
[Re: Pat_Whalen]
#945799
03/09/11 11:47 AM
03/09/11 11:47 AM
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Joined: Jan 2006
Posts: 1,220 toronto canada
69chargeryeehaa
pro stock
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pro stock
Joined: Jan 2006
Posts: 1,220
toronto canada
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Quote:
Quote:
Just say no to electric fans.
I'd love to hear the reason behind this...
me too.... i battled the overheat issue a long long time ago. for me, the solution was stock fan/shroud, i used a melling high-flow water pump, and a HD high-flow thermostat, and put in a electric pusher fan on the front of the rad (in a 69 charger/440). my problems went away except for the occasional extremely hot/humid days combined with traffic; if i find myself in that situation, i flick on the electric fan and i hold 180-190ish (with a 180 stat) and never overheat anymore. Few years ago at the moparfest (mopar show in ontario, canada) i remember all the cars pulled over with their hood open, overheated waiting to get into the show (over an hour of idle in 100deg temps), and i maintained under 195 with the electric fan... and it's baloney that they whistle or restrict the flow (maybe a tad), but the only time i use my electric fan is in heavy traffic and it works perfectly; it's nice to have that backup of the electric fan. every 440 i've had or seen has a running hot in traffic issue in hot weather....the electric fan gives you that extra air flow when it's hot and humid and your stuck at idle in traffic....things are right on the edge in that situation.
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Re: Fan to radiator location what is optimal?
[Re: 69chargeryeehaa]
#945800
03/09/11 11:57 AM
03/09/11 11:57 AM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
Quote:
Just say no to electric fans.
I'd love to hear the reason behind this...
me too.... i battled the overheat issue a long long time ago. for me, the solution was stock fan/shroud, i used a melling high-flow water pump, and a HD high-flow thermostat, and put in a electric pusher fan on the front of the rad (in a 69 charger/440). my problems went away except for the occasional extremely hot/humid days combined with traffic; if i find myself in that situation, i flick on the electric fan and i hold 180-190ish (with a 180 stat) and never overheat anymore. Few years ago at the moparfest (mopar show in ontario, canada) i remember all the cars pulled over with their hood open, overheated waiting to get into the show (over an hour of idle in 100deg temps), and i maintained under 195 with the electric fan... and it's baloney that they whistle or restrict the flow (maybe a tad), but the only time i use my electric fan is in heavy traffic and it works perfectly; it's nice to have that backup of the electric fan. every 440 i've had or seen has a running hot in traffic issue in hot weather....the electric fan gives you that extra air flow when it's hot and humid and your stuck at idle in traffic....things are right on the edge in that situation.
Why screw with a electric fan that loads our old electric systems when a stock cooling system does just fine. I said stock, fan and all.
I have lot's of experience with stock cooling and have driven my car's in extreme conditions at hi altiudes in very hot weather. It can idle all day long with my AC cranking and everything is stock in the cooling system. The motors are not stock, bigger cams and higher compression and my cars stay cool inside and the motors stay cool.
Why not use stock stuff and use the amps for your sound system or something else? A lot of electric fans don't move enough air to make em work well.
A lot of members have seen my postings about climbing Pikes peak, going 120 mph of the salt in 95 degree weather and cruising Reno in Aug. Stock works better than most other ways.
A lot of cooling issues are tuneup related.
Last edited by Challenger 1; 03/09/11 12:06 PM.
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