Hey do they have the low temp stat out yet for the 04 Hemi? Also what really does the electric fan do for the Hemi big power saver? How much am I looking at? Thanks

04 Hemi QC
Airaid C.A.I
Throttle body spacer
Jet chip 1
Magna flow exhaust

 

The electric fan is great as a replacement item. It does give you the opportunity to set the temp as to when the fan comes on and it will keep the fan running for a time after the the engine is turned off. They usually allow you to turn it on manually also, and it can be completely turned off in the case of drag racing. The factory fan is adequate for the truck engines. Be careful about changing the t-stat temps as the engine is designed to be run at specific temps for the lean burn engines, if it is lowered too much it is possible to set a check engine light due to incorrect temps. Personally, I would leave the original temp stat in it. If you are having problems with cooling, there is most likely something else wrong in the cooling circuit, or the stat you have is bad.
The biggest reason I can see for going electric is to clean up the engine bay area. If i did anything, I believe I would install a stainless steel flex fan on the factory clutch, to move a little more air at low speed or idling along in traffic.

 

Thanks for the info. Does the electric fan save on power? How much work is it to replace?

 

An electric fan doesn't really save much in the way of power. The only time the factory fan is used is normally during very low speeds due to the lack of air flow through the radiator, or perhaps if you were doing some heavy duty towing.
Installs for an electric are relatively easy. The original fan and clutch must be removed and bolts reinstalled to the water pump pulley, make sure they are not too long as to hit any part of the water pump housing The induction cowl around the radiator is usually removed. Then the electric is installed according to instructions.
This requires wiring into main battery supply at the power distribution center, and appropriate wiring to the thermostatic control switch usually located somewhere near the radiator if not mounted directly on one of the attachment brackets. One word of advice, if you do opt to go with an electric setup, make sure all wiring is run in flexible conduits and properly secured to the fenderwell, firewall or where appropriate. This will be pulling directly off the battery and will have a heavy #8 or ten guage wire to feed the fan motor. If the wires would short out for any reason, say goodbye to your battery, if the short is before the fuse.
The only other caution is locating the thermostatic sensor. I like to place them inside the cooling fins somewhere near the top of the core, which requires spreading some of the fins apart to insert the probe. Be extemely carefull here as its easy to nick one of the tubes, and then you'll have a leak---not good! If you take your time and pay attention to detail, the electric will give years of good service!!

 

I disagree with you when you say that they dont free up that much power... .. I had my first electric fan on my truck and took it to the DYNO... with the clutch fan INSTALLED I made 187RWHP average of 3 runs.... I then removed the clutch fan and made an average of 199RWHP average of 3 runs... So removing yoru clutch fan IS worth HP and is a MUST DO mod! Also there is only one large nut hoding your clutch fan on... On the 3rd gen Rams A good few WACKS to the passengers side will break her free... just spin your clutch fan off and your DUN.


Here is my fan set up for my 2002 4.7L Ram....









Can you say 18" MONSTER FAN? All I have left to do is get her wired up and Im done...

SPEED SAFE, AIR RAM

 

As with anything, all the little HP gains add up. The electric fans produce more HP by reducing rotating mass of the motor. This is similar to a lightweight flywheel or lightweight pistons. The benefit is more HP. The trade off is simplicity in design, there is no electrical stuff draining your battery and putting strain on the alternator if you had a high electrical load already in your truck. Everything is a give and take when it comes to an engine. It all depends on what you're using it for.

 

SPEED! [sm=gears.gif]

SPEED SAFE, AIR RAM

 

Well, Ok, I guess I have a slightly different picture of the use of a truck. If your looking for more power by streamlining the operation of that assembly, you could also eliminate the pulley driven water pump and go to an electric. But then I wonder where you really stop---duh, when the money runs out. While I agree the lowering the mass helps free up some of the parasitic losses, is the object of the truck to build a street machine? If so, it would be good to eliminate the air too--naw, just kidding. When the engine is up to temp and running down the road, the fan is free wheeling, rather than acting like an air brake.
The only time the fan is actually engaged is when the temp through the radiator is hot enough to engage the clutch. I think that a good set of long tube stainless steel headers that are ceramic coated to feed the magnaflow exhaust would be money better spent, then an upgrade for the ecu and larger injectors to feed the beast, and perhaps send the tranny off to B&M to have the torque management eliminated and the overall strength of the tranny improved. Sorry, I'm rambling

Enjoy the new fan setup!!!

 

Amen, brother!!

 

Hey thanks for the advise. 3 questions though. What make and model of fan is that? I,m having trouble trying to find 1. Does it keep the truck cool enough? Do you do any pulling with your truck?