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Old May 9, 2011 | 11:45 AM
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E-Fan

On the gasser fourms all you hear is "do an efan do an efan!" but I havnt heard that here. I'm a new 7.3 owner and was wondering if adding an Efan is a good idea or if it will make a difference since no one seems to talk about it.
 
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Old May 9, 2011 | 01:25 PM
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Generally speaking the benefits don't outweight the cost
One of the main disadvantages is the lower cfm output, making them lack luster while towing medium to heavy through a grade
 
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Old May 9, 2011 | 03:34 PM
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Our cooling systems ('cept for the OEM trans cooler) are huge, and do the job more than well-enough.

Why mess with THAT?

Pop
 
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Old May 9, 2011 | 03:38 PM
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Well, I had an F150 with the 5.4 and its fan was huge too. But adding the E Fan made a nice MPG increase of about 1-2 mpg.
 
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Old May 9, 2011 | 03:47 PM
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Originally Posted by TreySpooner65
On the gasser fourms all you hear is "do an efan do an efan!" but I havnt heard that here. I'm a new 7.3 owner and was wondering if adding an Efan is a good idea or if it will make a difference since no one seems to talk about it.
The factory fan moves a LOT of air...even more so when the clutch locks up. Have you experienced that yet? Usually only happens with a heavy load. You know those vent fans in the hoods over your kitchen stove? Imagine turning on 100 of those at the same time. That's what it sounds like when the clutch fan locks up.

We have a boom truck in our work fleet that has a GVWR of over 40,000 lbs. It looks like the same cooling system as the Super Duty trucks. If you are having overheating issues then your degas bottle cap might not be holding pressure. I've seen that a few times already...
 
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Old May 9, 2011 | 03:50 PM
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Im not having overheating issues. Nor am I doubting the ability of these fans. I was just wondering if anyone has but an efan on their 7.3 (safely) and had it work. More for fuel economy.
 
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Old May 9, 2011 | 03:52 PM
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When it's needed the e-fan could NEVER keep up with what the OEM fan can move at lock-up.

Remember, these trucks were designed to be able to tow heavy, uphill for long distances, and just keep going.

Think Grapevine with 16,000 pounds behind you. Now think deleted OEM fan and added e-fan.

Whatcha' thinkin' now........?

Pop
 
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Old May 9, 2011 | 03:54 PM
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Thats what I figured. Which is why I asked before I went a head and did it
 
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Old May 9, 2011 | 04:01 PM
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Originally Posted by TreySpooner65
Im not having overheating issues. Nor am I doubting the ability of these fans. I was just wondering if anyone has but an efan on their 7.3 (safely) and had it work. More for fuel economy.
Oh, I see. You are thinking of removing the stock fan and replacing with an electric? I doubt you will see any measurable mpg increase because these engines have torque to spare. Same with the A/C. No mileage difference when on or off.

You can get away without having a fan at all during the cool months. There was someone here that had their fan fall off and they didn't notice for a while. However, I doubt an electric fan will move enough air to cool the systems while towing in the hot weather. Any electric fan that can move that much air will also draw a bunch of current and you'll have to beef up your charging system to accommodate. Seems like the advantages are outweighed by disadvantages IMO. These are just my thoughts though....there could be someone who has tried this already and maybe they will post their successes or setbacks.
 
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Old May 9, 2011 | 04:08 PM
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Remember that electrical energy isn't "free" at all. It still takes more fuel to run an alternator that's making current than one that's not.

Also remember that you're converting mechanical energy to electrical (running the alternator) back to mechanical (turning the e-fan's motor) to do the same job that could have been done without conversion. Any time you "convert", there's heat produced, and that just goes into the air as a loss, i.e. fuel wasted.

If you never towed, and wanted to fine-tune your cooling system to the very edge of adequate, yea, you might gain something.

But you also might get onto the backside of that curve and burn up that expensive motor, too. That's something we virtually NEVER hear of here.

Pop
 
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Old May 10, 2011 | 07:25 AM
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Since my 7.3 has been down I've been doing some towing with my dad's 6.0 and have noticed that the fan clutch engages a lot more on those motors. I rarely ever hear mine kick in but the 6.0 does all the time.

Like it was said before you rarely hear of 7.3s overheating but I wouldn't risk running an electric fan because when it does get warm I don't think there is any electric fan that can pull th cfm that the stock fan does.
 
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