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View Full Version : auxilary fan specs and size for replacement



muddeprived
03-28-2010, 09:02 PM
I want to replace my aux fan with an aftermarket quieter fan but I don't know what the stock fan ratings are. Is it a 10" fan? What's the CFM and power draw?

Anyone know? I posted in 6 forums and no one has answered lol.




Thanks

4.3LXJ
03-29-2010, 12:12 AM
Gotcha on the other forum

BlueXJ
03-29-2010, 01:04 AM
Gotcha on the other forum

4.3LXJ I think it would be helpful to repeat the info here as well. It will add to out tech base.

4.3LXJ
03-29-2010, 01:24 AM
Well there were several posts on how much cfm fans put out and some speculation on what the XJ fans performance level was. My response was that the highest cfm rating I could find for an 11" fan was 2400 cfm from Darale. The question still remains how well the stock fan performs. Somewhere I think I heard 2000 cfm but I don't remember where or if it was for an XJ. A 16" efan will go as high as 3000 cfm

muddeprived
03-29-2010, 08:10 AM
I finally found the answer I think. There's a guy on my local 4wd hardware forum that did an electric fan conversion and he dug up the info during his project.

The stock fan ('97 & up) is;
Bosch GPB 12v 13.5Amps
12" dia x 3.25" depth

Flow;
.25 Cubic Meter Per Sec
900 Cubic Meter Per Hour
530 Cubic Foot Per Minute

So the factory fan is 530 CFM. If this is true I'll aim for a 750-1000 cfm fan.

Mudderoy
03-29-2010, 09:01 AM
I finally found the answer I think. There's a guy on my local 4wd hardware forum that did an electric fan conversion and he dug up the info during his project.

The stock fan ('97 & up) is;
Bosch GPB 12v 13.5Amps
12" dia x 3.25" depth

Flow;
.25 Cubic Meter Per Sec
900 Cubic Meter Per Hour
530 Cubic Foot Per Minute

So the factory fan is 530 CFM. If this is true I'll aim for a 750-1000 cfm fan.

I'm not sure if you want to replace both, but this is a long term project of mine. I was going to replace both fans with two 2500(?) rpm fans. Let them cycle on and off as dictated by their thermostats. With an override switch (of course) so I could just turn them on and leave them on.

I only mention this because replacing them both would save you some money rather than just replacing the electric fan and later replacing them both.

4.3LXJ
03-29-2010, 11:24 AM
I replaced both with 2200 cfm fans and built a shroud. This one is welded, but I have done it with pop rivets before I had my MIG.

Mud, check into Subaru outback fans. They have pretty good fans and are dual electric and pull pretty well.

muddeprived
03-29-2010, 01:04 PM
I'm not sure if you want to replace both, but this is a long term project of mine. I was going to replace both fans with two 2500(?) rpm fans. Let them cycle on and off as dictated by their thermostats. With an override switch (of course) so I could just turn them on and leave them on.

I only mention this because replacing them both would save you some money rather than just replacing the electric fan and later replacing them both.

I do have future plans of getting FFdynamic's triple threat e-fan setup (3 e-fans, no clutch fan) but not till the jeep is paid off next year. This is just a temporary fix to help with the misfire. I'm gonna use the stock fan for a couple days and see how it does.

BlueXJ
03-29-2010, 01:35 PM
I do have future plans of getting FFdynamic's triple threat e-fan setup (3 e-fans, no clutch fan) but not till the jeep is paid off next year. This is just a temporary fix to help with the misfire. I'm gonna use the stock fan for a couple days and see how it does.

Let us know how that works on your Jeep Mud.

TheWeiss
04-07-2010, 12:54 PM
I did the FFdynamic's fans and they are pretty impotent (i.e. they more or less suck). I bought the original 3 fans but have since had to purchase two more due when the originals just stopped working. I also currently have one that doesn't work. Since I moved up to a 3 core all metal radiator two do the trick but with my single core and three functioning fans I always watched my temp gauge climb dangerously high in any stop and go traffic, even when it was only 50 degrees outside. I highly recommend going a different route.

I'm looking to check out the dual fan pull shroud from a '96 - 2000 Ford Contour. Apparently with a little trimming to the shroud they fit reasonably well with a few zip ties. And word has it that they pull plenty of air.

muddeprived
04-07-2010, 01:01 PM
I did the FFdynamic's fans and they are pretty impotent (i.e. they more or less suck). I bought the original 3 fans but have since had to purchase two more due when the originals just stopped working. I also currently have one that doesn't work. Since I moved up to a 3 core all metal radiator two do the trick but with my single core and three functioning fans I always watched my temp gauge climb dangerously high in any stop and go traffic, even when it was only 50 degrees outside. I highly recommend going a different route.

I'm looking to check out the dual fan pull shroud from a '96 - 2000 Ford Contour. Apparently with a little trimming to the shroud they fit reasonably well with a few zip ties. And word has it that they pull plenty of air.

That's strange cuz all the reviews I read on the kit were all positive. One guys been running their fans for years without an issue and it keeps his jeep around 200 degrees, with a stock radiator. Maybe you just got bad batch of fans? That sucks though....

96xj
04-07-2010, 01:21 PM
why don't y'all check out http://www.slickcar.com/spal-fan.asp and tell me if there is something you like

4.3LXJ
04-07-2010, 03:35 PM
why don't y'all check out http://www.slickcar.com/spal-fan.asp and tell me if there is something you like

The thing I don't see that I want to is the CFM. I choose fans by overall size and CFM. That way you don't get a wimpy fan

96xj
04-07-2010, 04:43 PM
if you go to the link i gave find the size fan you want 10-16" push/pull etc.
click it and you will see options "Description Specs & Features Compatibility" click specs you will find the cfm's

TheWeiss
04-08-2010, 01:19 PM
What kind of CFM does one need to crawl and never overheat in an XJ?

4.3LXJ
04-08-2010, 01:27 PM
What kind of CFM does one need to crawl and never overheat in an XJ?

About 3000 CFM. I am currently running 4000

TheWeiss
04-08-2010, 01:46 PM
Then these Spal fans from 96Xj's link won't do the trick. The 10 inch fans only pull 650 CFM a piece and I don't think they would even fit. I think the biggest fans that you can fit directly on the radiator are 9 inch fans and those only pull 590 CFM.

Mudderoy
04-08-2010, 03:38 PM
According to the write up I saw on GOJEEP, you get a 15 or 16" fan from Summit Racing with a 2950 RPM rating. It fits in/on the OEM fan shroud, with some cutting. The fan is about $100. I was about to order it the other day when I thought I better get the heat out from under the hood prior to replacing something that is probably working fine already namely the heavy duty grand cherokee fan clutch I have in there now.

I would be putting the electric fan on really for maybe a 5% fuel savings and a much quieter operation.

4.3LXJ
04-08-2010, 04:13 PM
Then these Spal fans from 96Xj's link won't do the trick. The 10 inch fans only pull 650 CFM a piece and I don't think they would even fit. I think the biggest fans that you can fit directly on the radiator are 9 inch fans and those only pull 590 CFM.

My fans are 11". That is the biggest you can go

TheWeiss
04-12-2010, 06:31 PM
Do they zip tie straight through the radiator? Or do you have them bolted in? If so, do you have a pic?

4.3LXJ
04-12-2010, 08:14 PM
I made a shroud out of aluminum. this one is welded. The first one I made was pop riveted together.

http://i649.photobucket.com/albums/uu215/warriorsuspension/IMG_0174-1.jpg

Some kits give you the option of zip ties through the radiator. However after a few years they can wear holes in the tubes.

W.O.R.P.Offroad
04-12-2010, 08:22 PM
i have a question. do they need the same cfm with out the ac condenser in there? with out the condenser they have less to pull air though. so a fan wont be loosin as much cfm and wont work as less.

96xj
04-12-2010, 08:53 PM
Then these Spal fans from 96Xj's link won't do the trick. The 10 inch fans only pull 650 CFM a piece and I don't think they would even fit. I think the biggest fans that you can fit directly on the radiator are 9 inch fans and those only pull 590 CFM.

10 Inch SPAL Fan High Performance - (Pull)
Fan Specifications:
--------------------
Height (in Inches) 10.9
Width (in Inches) 10.6
Depth (in Inches) 3.7
Airflow (in CFM ) 1070 *******

http://www.slickcar.com/productdetails.asp?ProductID=103

W.O.R.P.Offroad
04-12-2010, 08:57 PM
check out the mr gasket one.

Mr. Gasket / 10 in. dia., 8.3 Amps draw, 950 CFM and 2600 RPM high performance electric cooling fan
Part Number: 1985

at 100 from autozone and other places


better yet the ones rene showed me.

http://www.jegs.com/p/JEGS/JEGS-Straight-Blade-Universal-Electric-Cooling-Fans/1042833/10002/-1

# 10" Universal Electric Cooling FanAmps: 7.0
# CFM: 1000
$52.99

muddeprived
04-16-2010, 07:23 AM
check out the mr gasket one.

Mr. Gasket / 10 in. dia., 8.3 Amps draw, 950 CFM and 2600 RPM high performance electric cooling fan
Part Number: 1985

at 100 from autozone and other places


better yet the ones rene showed me.

http://www.jegs.com/p/JEGS/JEGS-Straight-Blade-Universal-Electric-Cooling-Fans/1042833/10002/-1

# 10" Universal Electric Cooling FanAmps: 7.0
# CFM: 1000
$52.99

I was thinking about that 2nd Jeg's fan. Good price for 1000 cfm's.

I'm wondering about something. I'm not sure what's the best route to take.

1. Replace the entire oem fan/shroud with a 12" aftermarket e-fan

2. Remove stock e-fan from shroud and fab-fit aftermarket 10" fan inside shroud

Would I still get the same or better air flow if I choose #1?

TheWeiss
05-09-2010, 09:55 PM
Hey 4.3LXJ, Can you post the dimensions of your shroud? I think I'm going to try to build my own, but a place to start would be great!

4.3LXJ
05-09-2010, 10:32 PM
Hey 4.3LXJ, Can you post the dimensions of your shroud? I think I'm going to try to build my own, but a place to start would be great!

31X13"

It rests on the frame rails and has two bolts that go into the radiator crossmember on top. It is notched for the steering box. The first one I ever made was pop riveted together. Worked well and still have it. This one was welded.

urbantank
05-11-2010, 09:34 PM
ok another ? does our xj require push or pull fans

4.3LXJ
05-11-2010, 10:39 PM
Pull fans are what the factory uses. They are convenient if you have things like AC condenser cores in front and oil coolers. But, you can mount a pusher in front if all you have is a radiator. If you do, then you do not use a shroud and it is not quite as efficient.

TheWeiss
05-12-2010, 12:55 AM
4.3LXJ, is the shroud just a box that is 31X13? Do you have any relief factored in? I just replaced my rad and I found that there are two points at the bottom that could be used to hold something in place from that area and the top end has a number of options. What concerns me is having a flat backed surface that serves to suck in cool air while the Jeep is not moving (or moving slowly) but restricts air flow at highway speeds. How far back do your fans sit from the rad?

4.3LXJ
05-12-2010, 09:27 AM
Yes it is just a box. The thing is that the fans need to be about 1.5 - 2" from the core. So what you are using for fans will determine some of what you make. You can use the mounts at the bottom of the radiator. In my case, the smallest fans I could get that flowed a decent amount of air were 11", the same height as the core. So I went a little lower and a little higher so I could have a little room around the fans.

TheWeiss
05-31-2010, 04:48 PM
4.3 XJ, earlier in this thread you said you were running around 4000 CFM. What kind of fans are you using to do that?

4.3LXJ
05-31-2010, 09:01 PM
There are several part numbers you can use.

Derale fan part number 17918, 19, 26. All will pull over 2000 cfm.

Mudderoy
08-26-2010, 11:09 PM
I finally found the answer I think. There's a guy on my local 4wd hardware forum that did an electric fan conversion and he dug up the info during his project.

The stock fan ('97 & up) is;
Bosch GPB 12v 13.5Amps
12" dia x 3.25" depth

Flow;
.25 Cubic Meter Per Sec
900 Cubic Meter Per Hour
530 Cubic Foot Per Minute

So the factory fan is 530 CFM. If this is true I'll aim for a 750-1000 cfm fan.

Thanks for the information. I got the Flex-a-lite 112 electric fan. Which is either a 1050 CFM or 1107 CFM depending on what you read. Now I just have to figure out how to mount it. I'm not attaching it directly to the radiator.