elec fan and stock alternator

[rockyracoon]

can I run an electric fan with the stock alt.I also have pulleys.

 

[Roland69]

might be able to but some will say to go with a 3G alt upgrade

 

[Vinnietbird]

Do the 3G.It's simple,cheap,and you'll never have to worry about having enough power for your fan,stereo,heater,A/C,defroster,and lights.

 

[HISSIN50]

Which elec fan? As said, some have done it, with careful minding of the accessory load, but it's far from ideal.

 

[shorty1993]

Do the 3G.It's simple,cheap,and you'll never have to worry about having enough power for your fan,stereo,heater,A/C,defroster,and lights.

where can i find the details on this.

 

[big blue]

http://www.fordmuscle.com/archives/2003/02/electricfan/index.php

 

[HISSIN50]

Another source of 3G info is Jrichker's 3G post (he recursively posts it as it is requested. Search his posts). I think Srothfuss recently did a fairly involved thread about his install too.

Good luck.

 

[srothfuss]

You can find all of the information right here on Stangnet: DUW - 3G/efan swap thread I just did the swap and now have 14.4volts at idle with my Mark VIII fan on full blast. It's simply amazing!

You can swap to an electric fan with the stock alternator, but I don't think you or the car's electrical system will be happy about it.

Edit: Thanks JT for the introduction... I posted my write up along with all of JR's information in that thread.

 

[rickd93_lx]

hissin mentioned about the other acc. i own a mustang with no options, no power windows, mirrors hatch ect. i do have an ac and radio running off of the factory amp would i be able to go with stock alt.?

 

[srothfuss]

The problem with the stock alternators is that they are only rated at 65 or 75 Amps. Now, those amps are when the alternator is spinning above ~1,200RPM's (so at idle, it's even less) JRichker added up all of the factory electronics, computer, fuel pump, ignition, heater, etc. and that adds up to something like 70 or 75 amps.

Now throw on a electric fan that will run when the car is stuck in traffic or when you aren't going fast enough to get enough air across the radiator and you can really see the negative to running the stocker. Most fans draw a minimum of 10 Amps so also plan on that...

 

[WLDHRSE]

I have a junk yard elec fan on the stock alt with no problems but it's controlled by DCC. Either way you have to spend extra money. DCC cost less than 140 amp alt. I would rather do both, and probably will.

Cliff

 

[shorty1993]

thanks for the info.

 

[rockyracoon]

The fan I have is an sn 95.and by the way what is a dcc?

 

[srothfuss]

www.dccontrol.com

In my mind this is the only way to run an electric fan on your car.

 

[rockyracoon]

hmm interesting.so it seems like these controllers will do a pretty good job working on a 75 amp system.

 

[baskin]

It depends on where you live. Figure at 120 degrees out with the AC on, an m8 with a decent radiator will allow a 40 degree rise from a 140 degree air inlet temperature to 180. Now, at an 80 degree ambient temperature, your air inlet will be 100 degrees. You’ll only need 4.4 of the 35A total current draw in order to provide half the airflow.

Given that it’s typically below 80 degrees at night or when it’s raining, the fan will only draw about 4A while your lights or wipers are on. During a hot afternoon, neither will be on, so at a worst case of 120 degree ambient, you’ll have a 10A deficit. If the worst case outside is 110, the highest current the fan will draw is about 18A. The mark viii will cool better than most aftermarket fans at less than half the current, and is the best fan to go with if you want to keep the original alternator.