Message Board

 
 

2018 Western Meet
[clock1]

2018 Eastern Meet
[clock2]
 
 
Home  | Join  | Merchandise  | West Meet | East Meet | Monte photos
Meet Photos | Tech  | Museum  | Parts  | Registry  | Links  | Officers
 
 

Jump to content


Photo

Flex fan


  • Please log in to reply
10 replies to this topic

#1 pocobill7t1

pocobill7t1

    Bronze Member

  • Members

  • 698 posts
  • LocationPort Coquitlam BC Canada
  • Legal Name:Bill
  • Occupation:Outside sales

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

Leghome

    Maytag "Danged Agitator"

  • Members

  • 4,845 posts
  • Location35 mi NE of INDY
  • Legal Name:Larry E Gilbert
  • Occupation:Retired maybe

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.


http://www.firstgenm...-monte-trailer/
Larry E Gilbert
Markleville IN
"IF'n I had know retirement was this good I'd have done it a lot sooner"

#3 stangeba

stangeba

    Original Owner

  • Members

  • 4,616 posts
  • LocationShelby Township, Michigan
  • Legal Name:Bruce Stange
  • Occupation:Retired from E. I. DuPont Automotive Finishes still working at Langdon's Stovebolt Engine Parts Company.

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


Posted Image
Original Owner since May 14 1971

#4 bdk70monte

bdk70monte

    Member

  • Members

  • 164 posts
  • LocationBirch Run, Michigan
  • Legal Name:Ben Katt
  • Occupation:Application Developer III - FMI

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

zmanabba

    Member

  • Members

  • 241 posts
  • LocationSpokane, WA
  • Legal Name:David Grant Ziemer
  • Occupation:Truck driver

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

RealRed70

    Junior Member

  • Members

  • 428 posts
  • LocationWisconsin
  • Legal Name:Dan Starr

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

John S

    Junior Member

  • Members

  • 295 posts
  • LocationMcdonough GA
  • Legal Name:John Szymanski
  • Occupation:Nat. gas compressor engine tech

Posted 19 July 2017 - 12:23 PM

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

John S


1970 Monte
 
 

 


#8 bdk70monte

bdk70monte

    Member

  • Members

  • 164 posts
  • LocationBirch Run, Michigan
  • Legal Name:Ben Katt
  • Occupation:Application Developer III - FMI

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

stangeba

    Original Owner

  • Members

  • 4,616 posts
  • LocationShelby Township, Michigan
  • Legal Name:Bruce Stange
  • Occupation:Retired from E. I. DuPont Automotive Finishes still working at Langdon's Stovebolt Engine Parts Company.

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 


  • zmanabba likes this
Posted Image
Original Owner since May 14 1971

#10 John S

John S

    Junior Member

  • Members

  • 295 posts
  • LocationMcdonough GA
  • Legal Name:John Szymanski
  • Occupation:Nat. gas compressor engine tech

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
1970 Monte
 
 

 


#11 stangeba

stangeba

    Original Owner

  • Members

  • 4,616 posts
  • LocationShelby Township, Michigan
  • Legal Name:Bruce Stange
  • Occupation:Retired from E. I. DuPont Automotive Finishes still working at Langdon's Stovebolt Engine Parts Company.

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


Posted Image
Original Owner since May 14 1971




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

Home Page
Mission|Benefits|Join|Renew|Merchandise
Message Forum
Members' Montes|Meet Photos
Tech Info|Museum|Parts|Registry|Links|Contact Us