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Flex fan


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11 replies to this topic

#1 pocobill7t1

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Posted 06 June 2017 - 10:30 PM

Hi guys, with temps getting Warner I was curious to get your thoughts on using a flex fan? Yes or no or do they work being so far away from the rad, SB 350 fairly stock with AC....thx
Bill. AKA pocobill

#2 Leghome

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Posted 07 June 2017 - 03:30 AM

On my SB 350 I removed the flex fan and my 72 now runs cooler with the stock style fan with the fan clutch plus my gas mileage improved although only slightly.


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Larry E Gilbert
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#3 stangeba

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Posted 07 June 2017 - 03:12 PM

I added a flex fan to my 71 350 no a/c in 1972 from a Z-28.

The original 4 blade was noisier, no over heating issues.

I bet the de-clutching fan pulls way more air at idle with those 7 blades! Cost more also.

Bruce


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#4 bdk70monte

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Posted 11 July 2017 - 10:45 AM

My big block 402 was getting warm and the solution I found was to put a new clutch on the clutch fan.  I believe it was a heavy duty one, rather than standard.  There is also a supreme duty (if I remember the terms correctly), but read that it didn't cool all that much more than the heavy duty yet produced a lot more fan noise.  After replacing the clutch with the heavy duty one, I rarely ever get above 180 even on warm days.  So that could be an option if you're running a clutch style fan.

 

Ben



#5 zmanabba

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Posted 15 July 2017 - 11:45 AM

Not a fan of flex fans (no pun intended). I had one on my 70 due to financial constraints at the time. It was an aluminum one and one day a blade broke off and luckily didn't take anything with it. If you think about it anything that flexes will be subject to fatigue. I have heard of the fiberglass ones doing it also. The only plus there is the blades are light enough to not usually do damage. Also testing has shown ( I think Engine Masters was the most recent ) that the clutch fan is the least amount of power loss over no fan at all. I have a clutch fan on mine right now that I am very happy with. David   



#6 RealRed70

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Posted 18 July 2017 - 06:01 PM

Attached is a link to the style of fan I would use. I am not saying buy this fan, just saying this is what I would use.

http://www.ebay.com/...MZZA1Tc&vxp=mtr



#7 John S

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Posted 19 July 2017 - 12:23 PM

Also wondering can you use that clutch fan without A/C?

John S


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#8 bdk70monte

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Posted 19 July 2017 - 12:53 PM

Yes, I have a clutch fan like that on my 70 and it doesn't have the A/C parts on it anymore.  I'd like to get the A/C put back on and working again at some point, but the clutch fan works just fine without it.  Like I said, I did need to upgrade to the heavy duty clutch when I went to the big block though.  Keeps it nice and cool so far ever since then.

 

Ben



#9 stangeba

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Posted 19 July 2017 - 01:21 PM

Funny comment.. (I hope) about clutch or de-clutching fans.

 

What do they call the sound, made by this type of fan, when first starting the engine?

 

 

 

 

 

 

 

 

Morning sickness!

(as told to me by a Chevrolet engineer back int he 70's)

Bruce 


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#10 John S

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Posted 19 July 2017 - 07:41 PM

Thanks I have a flex fan on and it functions fine, but as in a previous post I also worry about the durability and the possibility of a blade breaking off. Something like that never happens in your driveway at idle.
John S
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#11 stangeba

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Posted 20 July 2017 - 06:42 AM

Ford had a recall on their flex fans in the 70's.

Rumor has it a mechanic was revving the engine after a tune up and the blade broke, cutting his neck and killing him.

One of my mechanic's at the Ford service dept. couldn't get a smooth idle on a customers car, I looked at it, shut off the engine and we found a missing blade or two causing an imbalance that felt like a rough idle.

I check mine, from a 72 Camaro, (not aftermarket junk) all the time.

Bruce


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#12 JUBAL

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Posted 01 August 2017 - 04:51 PM

My M.C. was overheating at stop lights. Called radiator shop and he gave me good advice. He said if it gets hot at the light, but cools off going down the road, you have a bad clutch on the fan. The usual test is to spin it and if it stops you think it is OK. It is not. He told me to pull it and if there is oil on the front of the clutch it is bad. It was. A new one made all the difference, and you could tell it with the hood open. I like the fan clutch over a flex fan, as I had to make a decision and chose to go with GM's design and it works.

Plus a chance to clean up the fan and paint it, which I had not done.




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