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  #1  
Old 05-02-2010, 04:16 PM
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mikeynags mikeynags is offline
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Default Flex Fans

What do you guys think of them? Are they good or should I stay away?
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  #2  
Old 05-02-2010, 11:08 PM
aarracer aarracer is offline
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I'll vote for the "stay away" side.
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  #3  
Old 05-03-2010, 12:55 AM
cudabob496 cudabob496 is offline
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Well, they're lightweight, and they flatten out at high rpm to reduce power losses. I here they are noisy.
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Old 05-03-2010, 09:49 AM
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JVMopar JVMopar is offline
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I've read that a clutched 7 blade takes less HP than a flex fan.

And when they flatten out they actually block airflow.

Just what I've read, I've never used one. But Cuda's right they are NOISY
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  #5  
Old 05-03-2010, 06:41 PM
cudabob496 cudabob496 is offline
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I agree, the viscous fan assembly from MOPAR for about $150 is the way to go. However, if you have an aluminum radiator, and a vented engine compartment, then you can get by on a cheapy electric fan from Summit, as I have been doing for the last 5 years. As long as my 496 Cuda is moving, I rarely have to turn the fan on! Make sure you have a fan shroud, but not one that blocks off all the air coming through the radiator!
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Old 05-03-2010, 06:42 PM
cudabob496 cudabob496 is offline
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Quote:
Originally Posted by JVMopar View Post
I've read that a clutched 7 blade takes less HP than a flex fan.

And when they flatten out they actually block airflow.

Just what I've read, I've never used one. But Cuda's right they are NOISY
I would imagine the light weight is a horsepower saver?
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Old 05-03-2010, 07:14 PM
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I seen a '79 Camaro that had a flex fan that came apart at about 5000 rpm. It did some pretty good damage.
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  #8  
Old 05-03-2010, 07:57 PM
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Gripe I saw one that came apart at the drag strip...

The owner was really pissed. Did you know that a fan shroud serves well a a funnel toward the radiator?

Just thinking out loud.
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Old 05-03-2010, 08:05 PM
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Default I had one

set about 1" into the shroud on a '76 Dodge pickup with a 440 that flexed a bit too far and ended up going through the radiator. Cost me about nearly 500 to fix all the damage it caused. I have never ran another one because of it.
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  #10  
Old 05-04-2010, 12:30 AM
Dart 360 Dart 360 is offline
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I have a 318 with a flex fan, the only reason its on as the car came with it, I have seen the damage they cause. I have bought the factory viscos fan, consumes less power and much safer, doesn't restrict air flow when disconnected.
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Old 05-04-2010, 12:39 AM
Rich Kinsley Rich Kinsley is offline
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The clutch fans always get the vote it seems. But to me they seem so heavy and I had one on that I do believe was out of balance and ate up my water pump bushing. A good shroud and clutch fan probably are a good deal but I've run the flex fans most of the time with no problems. Mine now is a $47 Summit aluminum fan. Very light.
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  #12  
Old 05-04-2010, 02:29 AM
cudabob496 cudabob496 is offline
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Ya, my engine can rev to 6500, and a flex fan at that engine rpm could easily
become a grenade it seems!
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