71 mustang 351c adding clutch fan

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71Grande

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Nov 15, 2019
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Location
Madison, VA
My Car
1971 mustang grande grandfather bought new.
New to the site. I’m sure it’s been talked about before but I’m wanting to put a clutch fan on my 1971 mustang. 351c. Ac car. What fan and clutch is everyone using? Thanks

 
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Hi and welcome from Michigan. I did this last year. The originals are dangerous and they can break. If you go to the search tab and type in clutch fan, you will find a lot of different threads about it. But the best one is check your fan blades. There are a few different links from Hemikiller for the deralie fan blades and the Hayden fan clutch.

 
Hello and welcome from SW Ontario.

On the 71, it would have had a 4 blade fan. I'm not totally sure when Ford switched to 5 blade flex fans, but I think these are what jpaz is referring to. These are definitely dangerous and need to be chucked in the nearest scrap bin. I worked at the factory where they were made and have seen the damage they do WHEN they blow up on test rigs.

Definitely research for the absolute best clutch fan set up out there if you want to go that route and are not concerned about originality.

Geoff.

Ooops, you said A/C, missed that, so your car may have had a different fan.

 
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Here's the parts needed for a clutched fan conversion.

The clutch you need is the Hayden 2710. The fan blade is Derale 18" 17118. You'll also need a stud kit, as using bolts in this application is a serious lesson in frustration.

https://www.rockauto.com/en/moreinfo.php?pk=1793512&jsn=2293

https://www.amazon.com/Derale-17118-Clutch-Standard-Rotation/dp/B004XONYK2

https://www.amazon.com/Dorman-Help-23733-Water-Pump/dp/B000CO779G
Are these the same parts for other engines as well? I am thinking 429/460 in our cars.

 
Here's the parts needed for a clutched fan conversion.

The clutch you need is the Hayden 2710. The fan blade is Derale 18" 17118. You'll also need a stud kit, as using bolts in this application is a serious lesson in frustration.

https://www.rockauto.com/en/moreinfo.php?pk=1793512&jsn=2293

https://www.amazon.com/Derale-17118-Clutch-Standard-Rotation/dp/B004XONYK2

https://www.amazon.com/Dorman-Help-23733-Water-Pump/dp/B000CO779G
Are these the same parts for other engines as well? I am thinking 429/460 in our cars.
429 cars used a 19" fan. Clutch and studs should be the same, unless there is a clearance issue and you'd need to peruse the Hayden catalog for a shorter clutch. 19" fan assuming you're using a factory 429 shroud, otherwise use the 18" I linked to.  

https://www.summitracing.com/parts/der-17119?cm_mmc=ppc-google-_-search-_-brands-_-keyword&gclid=Cj0KCQiA2b7uBRDsARIsAEE9XpGtNfSM27WKNtTa-X1NYXbUcTscqixrl_M2BZvi-fzlT_tKrCaqHNsaApupEALw_wcB

 
I had to use the Hayden 2947 on my 460 due to clearance issues at the radiator. It is so low profile that it is very difficult getting the nuts on the studs but with patience it can be done.

 
Wow - I guess I got lucky or something.  I'm using a monster 7-blade unit my buddy Jim gave me - I have no idea what it came from, except maybe his 1963 1/2 Galaxie 500 with a 390FE.  Bolted right up - no issues.  I think there is barely 1/4" clearance on the factory fan shroud - could be a big reason why mine stays so cool. I know when I didn't have the windshield or hood gasket installed, and I was moving the car in and out of the garage, the air moving from under the hood would blow my hair back sitting in the driver seat.

attachment.php


newfan1.jpg

 
Here's the parts needed for a clutched fan conversion.

The clutch you need is the Hayden 2710. The fan blade is Derale 18" 17118. You'll also need a stud kit, as using bolts in this application is a serious lesson in frustration.

https://www.rockauto.com/en/moreinfo.php?pk=1793512&jsn=2293

https://www.amazon.com/Derale-17118-Clutch-Standard-Rotation/dp/B004XONYK2

https://www.amazon.com/Dorman-Help-23733-Water-Pump/dp/B000CO779G
Thanks!! Parts are on the way!! Appreciate the info and fast response

 
If you haven’t ordered anything yet, I have a set for you to consider. I ran an 83 F350 fan clutch on a 9 bladed 2000 Ford Ranger 3.0 fan. I have since moved on to dual electric SPAL with a variable speed controller. I ran this combo on the 2018 Hot Rod Power Tour.

Not sure how to get it to Madison VA but if you have someone coming through Fairmont WV, I’d be willing to meet.

Aaron





 
Is there an optimum clearance between fan an shroud? Also, should the fan be all the way into the shroud or partly? I am wondering if someone knows these variables to optimize cooling.

Sent from my SAMSUNG-SM-G930A using Tapatalk

 
Typical wisdom is half a fan blade exposed out of the shroud and 1" clearance to the shroud itself.

71-73s used three diameter fans, 17 1/2", 18 1/2" and 19".

19" was 429 only

Aftermarket doesn't sell the fan in 1/2" sizes, so use the one that best fits your shroud.

 
Typical wisdom is half a fan blade exposed out of the shroud and 1" clearance to the shroud itself.
Interesting about half blade exposed. Mine has almost the whole blade into the shroud. I wonder if i should go with a smaller spacer betweeen pulley and clutch.

Sent from my SAMSUNG-SM-G930A using Tapatalk

 
The values we specify to our customers buying our industrial engines but designing their own cooling systems using a puller fan are 1/2 to 2/3 (2/3 is the target) of the blade width inside the shroud and radial clearance set to the minimum required to prevent interference. We ask for 10-20mm depending on whether the engine is mounted solidly or on isolators.

Just an FYI for what we do for cooling system design.

-Matt

 
The values we specify to our customers buying our industrial engines but designing their own cooling systems using a puller fan are 1/2 to 2/3 (2/3 is the target) of the blade width inside the shroud and radial clearance set to the minimum required to prevent interference. We ask for 10-20mm depending on whether the engine is mounted solidly or on isolators.

Just an FYI for what we do for cooling system design.

-Matt
Great information. That said i would have to find a way to move the fan closer to the engine. Unfortunately I just bought a new clutch when i did my engine. That included adding a new radiator which was thicker thus moving the shroud backwards.Any ideas which clutch fan would work?

Sent from my SAMSUNG-SM-G930A using Tapatalk

 
Last edited by a moderator:
The values we specify to our customers buying our industrial engines but designing their own cooling systems using a puller fan are 1/2 to 2/3 (2/3 is the target) of the blade width inside the shroud and radial clearance set to the minimum required to prevent interference. We ask for 10-20mm depending on whether the engine is mounted solidly or on isolators.

Just an FYI for what we do for cooling system design.

-Matt
Great information. That said i would have to find a way to move the fan closer to the engine. Unfortunately I just bought a new clutch when i did my engine. That included adding a new radiator which was thicker thus moving the shroud backwards.

Any ideas which clutch fan would work?

Sent from my SAMSUNG-SM-G930A using Tapatalk

Generally, there is no spacer between the water pump pulley and the flange on the clutch. If you have one, consider removing it and see where that puts your fan. Hayden does make a shorter clutch that is a direct swap for the 2710, the 2711. It's 3/8" shorter. There are others that look like they'll work, but you'd have to do some measuring to see if they'll work.

HAYDENFANS.JPG

 
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