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Old 02-13-2011, 08:28 AM
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Electric cooling fan

I'm considering removing my belt driven fan on my 327 and replacing it with an electric fan mounted to my aluminum radiator. Anyone have any suggestions on how many CFMs do I need & what brand is the best. Also, will I have to leave my factory shroud or can I just do away with it.

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Old 02-13-2011, 11:00 AM
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There are a lot of aftermarket electric fans, but CFM ratings are not very reliable and its hard to pick the right one. One very common alternative is to use the two speed OEM fan and shroud from a mid 90's Taurus, or the Lincoln Mark VIII. I have never heard anyone complain that this setup would not cool an SBC.

This is one article on installing the Lincoln fan
http://www.fordmuscle.com/archives/2006/10/Mark8Fan/ .

The guy in the article used a SPAL controller, but if you use the Ford fans, I would try to get the factory controller and relays along with it. The fan draws a lot of amps at startup and on high speed, and the factory relays are designed to take the load.

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Old 02-13-2011, 11:52 AM
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I used a Flex-a-Lite dual 12" fan with a thermal switch in my K5 Blazer and a 4 core radiator that was used in 3/4 ton and up trucks and I didn't have any cooling issues. The engine was a 350 with a 142ci supercharger.
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Old 02-13-2011, 11:55 AM
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I'm using a dual fan setup from a V8 camaro with my 406. It fit nice with some minor bracketry work and haven't had any problems yet. I think it was out of a 97 camaro.
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Old 02-13-2011, 01:38 PM
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I am using a dual electric from a late 90's Ford Winstar. Keeps my blown BBC cool with no problems. Nothing fancy, just a few relays, solenoids, and a diode. Right now I just have a toggle switch to turn them off/on. I will eventually go to a temp switch.

I read somewhere that they pull close to 4500 cfm, but I am not positive. They draw alot of juice, so a upgrade to the alternator is a good idea.
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Old 02-15-2011, 05:46 PM
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I use only one good electric fan, a Cyclone I think. Combined with a good aluminum rad it keeps the 283 cooled with A/C on in stop and go traffic at 100F. But just barely. Which is the way it should be. Anything more would be design overkill. I'm not sure which dia. it is, but here they are: http://www.ffdynamics.com/products_ultracoolingfans.htm
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Old 02-15-2011, 06:47 PM
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I've got a warmed up 351 Windsor in a 4000 lb 89 Lincoln Mark VII LSC
and have one of the 2 speed Taurus/Sable fans. On those fans, you'd
need the 2 speed fam from the V6 engine. The single speed with the small
engine wouldn't flow enuf.

I've got a 5.9 SUV with a Mark VIII fan. The Mk 8 fan flows more air by
maybe 20% but draws no more amps due to a more efficient blade design.

I have read that the current popular setup is the Chevy HHR fan (for the
larger engine option) and that it does well even on warmed up big block setups
offroad, and are available brand new (i.e. Rock Auto online) for about
same price as the used Taurus or Mark 8 fans.

Also popular are later model Mustang V8 dual fans.

The starting amp draw is of concern because it momentarily draws quite a
load on your system, which can be especially bad if you've recently driven

the vehicle and are restarting it and the fan tries to start at the same time
as you're turning the starter.

I use a Flex A Lite variable speed soft start adjustable on/off controller
on both of mine and they work flawlessly. I've had both of them for
several years. Like the name implies, they "soft" start the fan to avoid
the big amp spike draw, and they run the fan at 60% of full rpm when
they first start. If the engine continues to get hotter, the controller
automatically speeds the fan up till it reaches 100% of speed on high.
You can easily adjust the on & off temp, and the control runs the fan for
a few seconds after you shut the engine off to help prevent radiator
boil-over when the engine is hot.


I've driven both vehicles in 109 degree heat, high humidity, with loaded
vehicle and pulling a trailer, at 80 mph on the freeway and in town driving,
and never overheated.

Here's my write-up for my SUV install, along with wiring diagrams for
the control.


Here it is for my Taurus / Lincoln install


From what I read, the Chevy HHR fan would probly be sufficient for
your application, with the later model Mustang dual fans a good option.

Buying a used older fan like the Taurus or the Mark 8 (which aren't that
commonly available any more) is a bit of a crap shoot cuz you never know
how many miles are on them and how long they're going to last. You can
buy an oem brand replacement motor for those at any parts store for a little
over $50, and you can usually get a running fan for $50 to $70.

Here's the HHR fan


If you want to look for a used fan like a later model Mustang V8 dual setup
here's a very good place

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