Electric fan questions...

[marvin2]

I am wanting to install an electric fan on my bump to replace the manual fan that is just begging to eat some fingers. I picked up an elec fan from autozone a while back, but I don't quite remember the specs for it (size, amperage, and cfm it moves). First...What are the specs that I need to meet for this fan, so I know whether the one I have will work?

Also, I am looking at the thermostat sending units / relays for installing it and would like for you guys to approve / correct my logic for installation. I have an additional wire coming from the positive battery cable near the terminal. I was going to connect my power to this wire, run a 10 amp fuse (or whatever amperage the fan actually needs) in line, and then tie into the thermostat unit. I don't do much electrical work, so does this plan seem correct?

Lastly, will there be any problems running a single fan with the stock alternator? Thanks!

[Bullitt390]

I think you'll find the electric fan you buight will be inadequate unless it's the biggest robust fan out there.

Most guys snag an electric fan from a Lincoln Mark VIII which is a 2 speed fan. It pulls nearly 100 amps on the highest fan speed when starting so a fan like that needs a megafuse and high amp relay. The fan also pulls 5000 CFM which will cool just about anything.

So, it in order to use an adequate fan like that you'll need to upgrade the alternator, most likely to a 3G from a Taurus.

Josh

[marvin2]

I am not going to go through the Mark VIII fan swap at the moment. I would like to use the elec fan I have, if it won't work, I will try exchanging it for another one, or I'll just pull the plug on the idea for the time being.

When I do a search on summit's website, this is the fan that comes up for a 70 V8 F100:

http://store.summitracing.com/partdetai ... toview=sku

Its a 14 inch elec fan that draws 11.5 amps and moves 1250 cfm. Will this fan be underpowered for my application?

[fitzwell]

14 inch fan that pulls 1250 ain't gonna cut it anywhere south of the Mason Dixon line. You need 1850-2500, imho, to keep things manageable. Use a Painless 30102 kit to run the fan. 200 deg on, 185 off.

[Old Bird]

I am wanting to install an electric fan on my bump to replace the manual fan that is just begging to eat some fingers.

If losing a finger is your biggest concern, get a new fan shroud. Most of the parts houses have replacements for $100, or you can sometimes find them in the junkyards for $10-$20. Helps to keep fingers out and aids in cooling at the same time.

[marvin2]

I don't know that a fan shroud would work in this application...unless it was a deep one. I am not sure whether this is the original motor and fan. I know for sure that it is not the original radiator. The fan sits so far away from the radiator that the shroud would have to be a good depth to reach and cover the fan. I am going electric for sure, just might hold off now depending on how much the correct elec fan setup will run me.

Here's a pic...it just looks hungry ...

[scott123]

I have 2 Hayden 10" fans on the back of my super cool and a Hayden 2 fan adjustable controller. They work better than the stock set up.

[wickedinhere]

I got a 16 inch from summit and it is 2350 cfm perma-cool 19126 its 99.00 .

[Bullitt390]

1250 CFM won't cool a lawnmower.

Why waste the time buying one fan, finding out it doesn't work, getting another fan, figuring out that one doesn't work and so on...

Either:

A) get a fan shroud and be done with it or...
B) Pick up a Mark VIII fan for $14 at the junkyard and be done with it. That fan could practically cool a Semi it pulls so much air, it fits our stock radiators perfect you just need to wire it in with a couple relays.

Josh

[Wes]

I don't know that a fan shroud would work in this application...unless it was a deep one. I am not sure whether this is the original motor and fan. I know for sure that it is not the original radiator. The fan sits so far away from the radiator that the shroud would have to be a good depth to reach and cover the fan. I am going electric for sure, just might hold off now depending on how much the correct elec fan setup will run me.

Here's a pic...it just looks hungry ...

That fan on your engine is a fan clutch type fan. someone has eliminated the fan clutch. You could use your 14" fan in front of the rad as a pusher set 200 on 185 off, put the fan clutch back and add the correct shroud ( yes they are deep) you'll run cool as can be.
You could use the pig tail from the + bat cable, or the starter solenoid bat stud. I would use a 20 amp slow blow piece of fusible link at the starter solenoid to 1 side of a 30 amp ISO relay, the other to the fan. Use keyed battery power to the control side of the relay, the sensor should ground to close the control circuit of the relay. I like to use a 81-82 dodge Horizon fan temp switch. The switch grounds @ 175 degrees. This switch is 3/8 pipe (memory may be off) is easy to adapt.

[fitzwell]

1250 CFM won't cool a lawnmower.

preach on brother!!

B) Pick up a Mark VIII fan for $14 at the junkyard and be done with it. That fan could practically cool a Semi it pulls so much air, it fits our stock radiators perfect you just need to wire it in with a couple relays.

Josh

14 bucks...i'll take about 10 at that price, let me know what shipping is to Texas

[Bullitt390]

Junkyards around here charge $12-14 per fan, no core. I just wish the Taurus or Windstar fan fit better, you can count on loads of those being at the yards. Mark VIIIs (or Thunderbird) are harder to come by sometimes, but usually there are about 2 in each yard per week.

Josh