I want to upgrade to an electric since the OEM clutch takes out the fan above 1200rpm or so, just when I need it, pulling my 10,000GVW on a 14% rocky mountain switchback grade at 3-5mph and 1500- 2400 rpm.

Jimmy

 

a friend of mine has an electic fan on his short box sible cab with a 160 cummins... a lil modded. he does not tow though... hasnt had overheating probs like that

 

I don't have one on my truck, but I have used them on several (high horsepower) cars in the past. They work very well by themselves or as additional fans. I highly recommend getting one with a built in thermostat then you don't have to mess with it. Otherwise I suggest putting o switch on it so you can shut er off when not needed.

 

I seriously doubt that any fan on the market will be able to move enough air

How about a Horton Fan Clutch? It is a thermostatically controlled electric clutch driven fan. It engages similar to the clutch on your ac compressor.

 

yes there is a fan on the market. and it is worth the money.

i will post the brand and part number later.

i had it on my 94 dodge that i traded in for the 97 i have now. i gained 3-5 MPG with them and also more power and u could feel the difference.

 

Thanks Dr., I will look into that and Joe66 look forward to the link on the other.

 

I'm waiting with sweaty palms and figity fingers... or should I have asked how MUCH later?

 

It's probably a Spal. I don't know their models, but they're consistently the only AFTERMARKET electric fans I see that really cool well. They're also expensive, but worth every penny. I'll give you an example: Those of you who are Car Craft readers may remember a '67 Pontiac Tempest that was featured about 8 or so years ago. The car is blue, and at the time had run mid-low 11's on a 9" slick, with a quadrajet carburetor and no nitrous. Street car, with a/c. Moderately big and heavy car, with a 455 and a/c. Spal cooling fans all the way. No overheating problems. Same on his 9 second Grand National if I remember correctly.

 

It would be nice to ditch the stock fan and put a nice electric on there. Is 3000 CFM enough out of this 16"? They also have a dual 12".
http://etxiow.accpaconline.com/itemd...&item=30102113

 

I don't know whether that's enough or not, to be honest. I would THINK it probably is, since the fan isn't really needed at road speeds where the most heat will be produced. As you know, these diesels don't produce that much heat at idle, which would tend to reduce heat loading when sitting at traffic lights and stuff like that.

 

It sounds like there's something going on with your fan clutch. My fan works fine when it's needed, like going up a 6% grade at 70 MPH @ 2350 RPM. It sounds like a jet engine when it kicks in.

Voice of experience - 50 amps x 12 volts = 600 watts = 0.8 BHP which isn't enough to move the cooling air required for sustained full load operation such as towing a heavy 5th wheel up a steep grade. I paid a lot of money to learn this lesson - I'm sharing my experience for free.

Rusty

 

There are electric fans out there that will cool a bombed Cummins while towing heavy but they will most certainly NOT work with the existing electrical system.....these fans typically require their own alternator and sub-electrical system and are around $1000+. This is not your off the shelf stuff.....Desert race trucks have used them successfully for years. I have a lot of experience with Spal fans (not on a CTD) and can say they are some of the best off-the-shelf electric cooling fans on the market but don't bother with them if you have a bombed CTD that you tow with.......3000 CFM - even 6000 CFM simply isn't anywhere near enough air flow to cool a CTD at peak demand.......think more along the lines of 20,000 - 25,000 CFM. As Rusty pointed out, a simple HP calculation is another good way of illustrating the difference in HP requirements for cooling fans - it isn't even close.

Some guys will be able to get away with electric fans but they will have to be stock or lightly fueled and not tow.....if this does not describe your truck, don't even think about electric fans unless you are ready to make a large financial commitment to installing a set of fans from an offroad race truck.

 

Im looking at running electric cuz i dont have room fora fan and clutch. so for im without o0ne all together and havent had any problem. just have to watch temp closer. im either going duals or 2 big pushers. so that way im safe on trips, plus im not really into pulling stuff so i should be fine there. but i like i said i havent really needed a fan yet.

 

Check this out,http://www.flex-a-lite.com/auto/html...-electric.html
saw it in DIESEL POWER mag.model#284 6000 cfm airflow-36 amp draw but did not see it on web page

 

here it is http://www.flex-a-lite.com/auto/html/whatsnew.html