Cant stay cool

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Mar 21, 2014 | 09:16 AM

#46

djb383

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Joined: Nov 2009

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From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Quote:

Originally Posted by Petervaz1

I'm pulling 3400 cfm. What does the stock electric fan pull? Maybe I should just run 2 of those

OE stock efan moves about 2300 CFM. The OE belt fan, with a good fan clutch, will move way air than the OE efan. I would think at 3300 CFM u r falling way short of the OE stock CFM numbers. Your 3 row rad may be falling short when compared to the OE stock rad.

http://www.jeepforum.com/forum/f11/e...sults-1182706/

Mar 21, 2014 | 01:45 PM

#47

Petervaz1

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Model: Cherokee

Quote:

Originally Posted by salad

Like 1000. The factory electric fan is an auxilliary unit only. The factory clutch fan can do around 4000 CFM when the clutch is fully engaged and you're on the gas. Are you on stock gearing? Aux transmission cooler? BTW this pretty far from OEM tech lol

456 gearing and I do have stock trans aux cooler.

Mar 21, 2014 | 01:47 PM

#48

Petervaz1

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Model: Cherokee

So since everybody says my fans I'm gonna get rid of one E fan and reinstall my stock clutch fan. Sound like a good plan?

Mar 21, 2014 | 03:36 PM

#49

Firestorm500

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Year: 2015, 2012

Model: Grand Cherokee (WK2)

Engine: 3.6L

3 row aluminum radiator is too thick. Not enough airflow. Your 3 electric cooling fans are also blocking airflow at freeway speeds.

Recommend factory setup with 1-2 row aluminum radiator.

Mar 21, 2014 | 04:01 PM

#50

djb383

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Joined: Nov 2009

Posts: 8,172

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From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

I'd almost bet the 3 row core is no thicker than the factory 1.25" thick 1 row core. When u subtract the total of the 2 spaces between the 3 rows, say 1/2" maybe more, the actual total width of tubing that carries coolant may be less than the 1.25" wide OE tube. Air flow thru the 3 row should be the same as the 1 row OE since both cores are virtually the same thickness.

Last edited by djb383; Mar 21, 2014 at 04:09 PM.

Mar 21, 2014 | 08:39 PM

#51

Firestorm500

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Joined: Apr 2009

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Year: 2015, 2012

Model: Grand Cherokee (WK2)

Engine: 3.6L

Quote:

Originally Posted by djb383

No, aluminum radiators, due to their superior heat dissipation properties, need to be the thinnest they can be and still cool the coolant. Too thick and airflow is reduced.

In this case, less is better.

Since the OP cannot run the factory fan, his radiator is too thick.

Mar 21, 2014 | 10:28 PM

#52

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

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From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Quote:

Originally Posted by Petervaz1

.......But the only problem with the three row radiator is the mechanical fan being to close......

Does Champion say "WARNING - don't use 3 row rad with belt fan"?????

Quote:

Originally Posted by Firestorm500

No, aluminum radiators, due to their superior heat dissipation properties, need to be the thinnest they can be and still cool the coolant. Too thick and airflow is reduced.In this case, less is better. Since the OP cannot run the factory fan, his radiator is too thick.

No to what? The reason why OE aluminum rads are more efficient is due to their very wide tube(s) design. An aluminum rad with a poor design (narrow tubes) will not dissipate heat as well as an aluminum rad with good design (wide tube(s). In this case, more (wider) is better. That's what all the OE designs have gone to.....less rows but wider rows with the total core thickness remaining about the same.

One 1.5" wide tube will dissipate heat better than 3 tubes 1/2" wide each. There will be virtually no difference in air flow thru a 1 row 1.5" thick core than a 3 row 2" thick core.

Mar 22, 2014 | 01:24 PM

#53

Petervaz1

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Model: Cherokee

A little leakage

Mar 22, 2014 | 02:38 PM

#54

Petervaz1

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Model: Cherokee

New brass plugs installed

Mar 22, 2014 | 04:31 PM

#55

Petervaz1

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Model: Cherokee

Quote:

Originally Posted by djb383

Does Champion say "WARNING - don't use 3 row rad with belt fan"?????

No to what? The reason why OE aluminum rads are more efficient is due to their very wide tube(s) design. An aluminum rad with a poor design (narrow tubes) will not dissipate heat as well as an aluminum rad with good design (wide tube(s). In this case, more (wider) is better. That's what all the OE designs have gone to.....less rows but wider rows with the total core thickness remaining about the same.

One 1.5" wide tube will dissipate heat better than 3 tubes 1/2" wide each. There will be virtually no difference in air flow thru a 1 row 1.5" thick core than a 3 row 2" thick core.

It does not say warning but it's pretty scary close to the radiator

Apr 1, 2014 | 12:00 AM

#56

Petervaz1

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Model: Cherokee

So I took my manifold off and my PCV was dumping oil into it so that could of been one of my problems, Oil separator solved that problem. i also went back to a mechanical fan with zj clutch and took my ac condenser off. I drove it for 10 min and she's staying cool so far. I need to test her this weekend going up the mountain.