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Flex fan
#1
Anyone running a flex fan? If so which one. Direction of rotation? Spacer size? I wanted to run electric fans and will one day but for now going with a flex.


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#2
I just have the stock flex fan that came with the car. '73 with a 351c. No fan clutch, just a spacer. (I don't know if they ever came with a fan clutch or not).

Electric is nice at slow speeds, I prefer mechanical at higher speeds.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#3
will e;28193 Wrote:I prefer mechanical at higher speeds.

I prefer mechanical for safety reasons. Electric devices are prone to failure, a mechanical one will rotate when the engine is running. (Same reason I got a mechanical fuel pump).
I do have an electrical fan for support that kicks in when the temperature rises in situations like stop and go traffic.
This being said, I am planning on replacing the stock fan with a flex one too in the near future, so I´ll keep an eye on this thread.

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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#4
Why would you need a mechanical fan at higher speeds? The giant grille should let plenty of air pass through the radiator without any fan when you're moving. The only reason you need a fan is to move air across the radiator when the car isn't in motion.
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#5
Mine has the stock 5 blade flex fan. The spacer is 2 5/8" long. I remember it having been replaced because of a recall from Ford. The replacement looked the same as the original. There was an issue with some of them coming apart.
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#6
Should we take our cars in if we don't have the new spacer from the recall? Lol

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
73 F-code Convertible, Planned: color TBD/Black top/White Int., 351C, 5-spd, 3L50.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#7
Actually it was the fan that was recalled.
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#8
Roy, are you aware of this option: http://www.fordmuscle.com/archives/2006/10/Mark8Fan/ ?
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#9
dohebert;28195 Wrote:Why would you need a mechanical fan at higher speeds? The giant grille should let plenty of air pass through the radiator without any fan when you're moving. The only reason you need a fan is to move air across the radiator when the car isn't in motion.

Right! At at speed the flex fan 'flattens out' to help reduce drag.

In my Jeep club we always go back and forth on electric fans. (My jeeps club is older jeeps, we all have mechanical fans) For Jeep'n electric fans work really well at low speeds (4 wheel'n) and have the added advantage that they can be turned off at water crossings.
But many folks complain that their jeeps run hotter at highway speeds. A lot of that, I believe, is the fan is actually blocking air flow. My mechanical fans have a shroud that doesn't cover any of the radiator nor does it force the air to pass by the fan. Electric fans (espeically ill fit aftermarket ones) cover part of the radiator and force all of the air to pass through the fan.

Much of the shroud is just an 1/2 inch or so from the radiator. This, IMHO, basically 'blocks' the air when you are traveling down the highway. And the electric blades also act as a block since the air can't move to the outside of them. (Unlike our fans where there is some clearance between the outside of the blade and the shroud).

again, just my 2 cents worth and something to think about.

Electric fan = good for drag strip. Keep it cool while staged. Turn off during run.

Electric fan = good if designed into the overall cooling system of a daily driver.

I think they are iffy for aftermarket replacement of a mechanical setup.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#10
I am running a stock H code cleveland fan which I drilled to accept the 3/4" water pump shaft on my 460 with an Advance Auto parts 3 row stock replacement radiator. I use an Edelbrock aluminum water pump. I have had a 160, 180 and 195 degree tstat in it. It will hold all of those temps. I settled on the 180. My point is the stock fan seems to move plenty of air if the tune and the rest of the cooling system is up to snuff.

Heard some horror stories on the flex fans coming apart.

I am also of the mind that electric fans (and electric fuel pumps) are just another thing to break.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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