HAVE A 289 2 BARREL, AM REPLACING 2 CORE WITH 3 CORE RADIATOR, IF I GO TO ELECTRIC FAN HOW MANY CFM DO I NEED? IF I NEED A BIGGER ALT. WHAT ELSE TO CHANGE? HOW MUCH HP WILL I INCREASE?

 

I think almost any electric fan will cool well with a 3core radiator. You may need a higher output alternator, probably so. HP increase will be almost non-existant, the power used to drive the stock fan will be redirected to turn the higher output (and drag) alternator.

 

IMO get a fan that pushes as much air as you can afford.

I purchased this unit because it moves 3600 cubic feet of air a min, + it is only 3 1/2" thick, even so it barley fit, I had to offset it a little.

http://store.summitracing.com/partde...p;autoview=sku

I also got a fan controller that starts at half power and gradually increases the speed of the fan as things heat up, this should save on electrical system stress.

If interested the controller is a Spal unit, I do not see it available on any on line parts vendors though, might check with your local speed shop.

 

I would think that somewhere around a 3k fan would do. It will need around 20 to 30 amps under load to spin it. Sometimes the savings in horsepower over a mechanical unit is consumed by the additional load of the alternator, so its pretty much a trade off. One thing I would do is use a 70-80 amp relay in the power circuit as sometimes the 30-40 amp relays will toast their contacts. A diode will be necessary in the control circuit if you are going to run an A/C.

 

anything near 3000 cfm will be great.

It will draw about 14 more amps when its running a 60 amp alternator will be fine.

you WILL gain HP using the electric fan just NOT when the fan is running. Apparently everyone has overlooked the fact that the electric fans actually shut themselves off when not needed.

sometimes ill drive my mustang to my other residence which is 80 minutes away. The electric fan is on for a total of zero (0) minutes during the trip (it never comes on). So Yeah I save some HP (and fuel) especially at 3000 rpm for most of the trip.

Gun

 

Good point gun jam.

 

So will a clutch fan. And you don't have the wiring issues. Not to overlook them.

 

I have one of these on mine:
http://cgi.ebay.com/ebaymotors/SPAL-...spagenameZWDVW

with an AFCO aluminum radiator. I got stuck on the Interstate last Saturday in a traffic jam....took 1 hour to go 1/2 mile. Never over heated. Temp just modulated between 185 to 195....

 

James do you find the E-fan to be that much of a benefit?? I have a MkVIII, and a 3.8V-6 electric fans to choose from, but the more I study up on the installs, the benefits really seem to be with a good "low tech" clutch fan.


andthisispost200,hopeipassedtheaudition

 

I've been really pleased with mine over the last 3 or so years. Never had a lick of problem with it keeping the car cool. With the radiator I have, putting a regular fan in was going to be difficult.