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Re: Mercedes fan upgrade
[Re: hooziewhatsit]
#838430
05/18/11 04:54 PM
05/18/11 04:54 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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What's life without a little adventure?  Did you stuff your water hose in a block passage and blow out any nasties that may be lurking about? It's a good idea to pull the block drains and make sure the system is clean. Those are easy to reach on a truck.
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: Mercedes fan upgrade
[Re: John_Kunkel]
#838432
05/18/11 08:25 PM
05/18/11 08:25 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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That's why the pointy nose cars have spoilers under the radiator support. It blocks air flow from the outside and creates a low pressure area behind the radiator that helps draw air.
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: Mercedes fan upgrade
[Re: feets]
#838433
05/19/11 04:32 PM
05/19/11 04:32 PM
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Joined: Jan 2003
Posts: 25,871
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,871
Rio Linda, CA
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So, your contention is that ALL cars will have ram cooling at speed and don't need a fan?
The INTERNET, the MISinformation superhighway
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Re: Mercedes fan upgrade
[Re: John_Kunkel]
#838434
05/20/11 12:08 AM
05/20/11 12:08 AM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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All is a really broad term but I honestly feel that the vast majority of production vehicles fall into that category.
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: Mercedes fan upgrade
[Re: feets]
#838435
05/20/11 05:11 PM
05/20/11 05:11 PM
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Joined: Jan 2003
Posts: 25,871
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,871
Rio Linda, CA
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I honestly feel that "the vast majority" is a really broad term.
The INTERNET, the MISinformation superhighway
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Re: Mercedes fan upgrade
[Re: John_Kunkel]
#838436
05/20/11 08:22 PM
05/20/11 08:22 PM
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Joined: Oct 2007
Posts: 3,897
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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Ok, wth, lol Got the new pump in. Idling in the driveway, fan is at full speed, and the temps are going up  Bring the RPMs up, and the temps edge down a couple degrees and hang there, and it definitely won't go back below the thermostat. Anywho, yesterday I got the new circuit board ready to test, so I'll put that in today and run it for a couple days to make sure it doesn't fry itself, then I'll send one to Andy to test in a car that actually works  I may throw the old pump back in and just limp it along until I get the mag 408 built 
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: hooziewhatsit]
#838437
05/20/11 11:27 PM
05/20/11 11:27 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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If you're still overheating then you have a problem. Have you checked for a temperature drop across the radiator? A clogged radiator will be much cooler in the center than the inlet and outlet. You should see about 30 degrees difference between the upper and lower hoses with a progressive change across the core. You aren't getting much circulation. Did you test the thermostat to verify it was opening? One of those fans cooled Andy's 5.9 Magnum while laying on top of the engine. You're not having an air flow issue. Oh, just to close out the thing with Johnny-boy I present this: Quote:
Engine Fan Test
The radiator cooling fan is an important part of the cooling system operation. While a fan is not really needed while a vehicle is traveling down the highway, it is extremely important when driving slowly or stopped with the engine running.
When the car was in motion, the speed of the air entering the grill was sufficient to keep the coolant at the proper temperature, so the fans were shut off. When the vehicle came to a stop, there was no natural air flow, so the fan would come on as soon as the engine reached a certain temperature.
Taken from: http://www.familycar.com/classroom/coolingsystem.htm
Quote:
The fan is usually not needed when the vehicle is traveling fast enough for ram airflow through the grill to provide cooling (typically at speeds above 30 mph).
Taken from: http://www.aa1car.com/library/electric_cooling_fan.htm
Quote:
When moving at highway speeds, the cooling fan is not required to maintain the water-cooled engine at a safe operating temperature.
Taken from: http://www.wisegeek.com/what-is-a-water-cooled-engine.htm
Quote:
At highway speeds, the air flow through the radiator is sufficient to provide proper cooling without the aid of the fan.
Taken from: http://www.flowkoolerwaterpumps.com/info/cooling_system_overview.html
With that, I'm done with the highway speed debate.
For some people the world is, and always will be, flat.
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: Mercedes fan upgrade
[Re: feets]
#838438
05/20/11 11:32 PM
05/20/11 11:32 PM
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Joined: Oct 2007
Posts: 3,897
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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If you don't mind, lets move my cooling issues to the other thread, here: https://board.moparts.org/ubbthreads/show...e=0#Post6639737But yes, the top hose is very hot, and the bottom hose I can hang onto just fine, so the rad is dropping temperature. New thermostat, but I should probably throw the old one on the stove to see if it was opening or not.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: John_Kunkel]
#838440
05/22/11 12:53 AM
05/22/11 12:53 AM
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Joined: Oct 2007
Posts: 3,897
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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Finally, an update worth noting. With a new thermostat that actually opens, I've been getting much better results. I haven't seen anything over 40% from the fan driving through town now. With the hood open and the fan at that speed, it's barely audible  At idle it hasn't needed much more than 25% from the fan. And it looks like I'll have to add logic to turn the fan off completely if the temps drop too far below the target temperature. At highway speeds, even with the fan at 25%, I'm not seeing the temp go up drastically at all from interference from the fan.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: Andrewh]
#838445
05/24/11 12:58 AM
05/24/11 12:58 AM
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Joined: Oct 2007
Posts: 3,897
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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Yep, the output is limited to between 25% and 90%. I've put a dozen or so trips on it in the last couple weeks and it's still working great.
Andy: I'm debating sending you an (ugly) box that has a display to show you exactly what it's doing at any given point (it shows the target temp, actual temp, and the fan output percentage). You'd have to extend the temp sensor wires and the fan control wires to the cabin to where you can watch the screen. Otherwise we'll be guessing as to what it's actually doing.
I can also send a programmer so you can update the code if we need to make any changes. Sound like a plan? I can probably send it off to you later this week.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: feets]
#838448
05/26/11 07:04 PM
05/26/11 07:04 PM
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Joined: Oct 2007
Posts: 3,897
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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Drove around the last couple days with the actual circuit board installed. It hasn't burned itself up yet  I'll build another couple of them and send one to andy for testing in warm weather (it snowed here yesterday  ) Andy: do you have a digital temp gauge you can monitor? Also, you need to use the stock mopar temp sensor, right?
If you ever find yourself in a fair fight, your tactics suck.
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