Great info. Especially the picture of the 3 side by side.  I wish I could have found something like that a couple of months ago.   Did you have any problem with pore machining on the water pump mounting flange of that 2711??  I bought one from NAPA and it way out of spec and could not be bolted up.  Then I bought one from O'Reilly's  and it to was a little off (better than the Napa one) I still had to use my die grinder to get it to bolt up properly.  They were both obviously made in the same factory and had the same part # printed on the front of the clutch.

Good info, thanks. Which radiator are you using?

Great minds think alike I just went through the same thing with my galaxie.  These are the posts I made on my Galaxie forum

Found more parts (not for a 62 Galaxie) to put in my 62. Clutched fan

Daze wrote:

For those of you that have been here a while you know that I am all about customizing my car and using parts from any make, model, and year to maximize performance and function.  To that end I have found another upgrade.  My car is currently setup with an aluminum radiator, 302 and mechanical fan.  I was able to use foxbody Mustang engine mounts to drop the 302 into my 62 without modification.  The only issue is there is not a lot of space between the front of the engine and the radiator (about 3.5")  In order to mount the fan I am currently running I used a short spacer and then a 17" flex fan.  System works fantastic, moves a ton of air but it is also very loud and the constant spin of the fan eats HP.  Being its a small block in a big car I need all the HP I can get.  

A simple solution to this issue is a thermal clutched fan.  The problem is most of them take up more space than I have.  The key word there is most as I think I found one that will work.  As You know most parts places want year make and model to find parts so it can be a challenge to find the correct part based on specs and not the car it was designed for but I have figured out some good ways around that.  I went to Summit Racing and looked up fan clutches.  A bunch came up, problem is their web site does not offer any measurements so I then took each part # from Summit and input it into Napaonline.com.  The Napa web site is one of the best I have found to have measurement and other fitment specs. After checking a a dozen or more I found the shortest one they make that is still a 4 bolt for both the water pump and fan.  Napa's site listed a  fan mounting height of 1.4" but did not give me the entire height including the clutch piece so I went to Napa and measured one.  Looks like 3" which should just barley fit.  Original car this clutch was used on was an 1980 Cougar among other applications.  I then found an aftermarket 17" fan that will bolt up to this clutch and ordered it.  I will take some before and after pix and report back how it all worked once the parts come in and I get them installed.

Daze wrote:

Finally got the fan in the mail and picked up the clutch from Napa.  Here is a pic of it all put together, next to the fan that I am replacing.  I already did a test fit and the clutch will be about 3/8" from the radiator.  a little closer than I would like but acceptable.


 

Daze wrote:

got it installed.  Its a little bit quieter and should save on power.  Have not had a chance to do much else with the car but I assume it will keep it nice and cool.  seams to draw a lot of air even at "cold" speed.

Bolted to Floor wrote:

I was doing some digging for the same thing on my car and stumbled across another part number that is shorter than  a Hayden 2711 on another site. I made a spread sheet to compare. Its Hayden 2765. Your Derale fan has a dual bolt pattern that will mate up to this clutch.
 Hayden 2765Hayden 2711Hayden 2710Bolt Quantity444Bolt Thread5/16-18 Hole5/16-18 Hole5/16-18 HoleClutch TypeB - Non-Thermal and Std ThermalB - Non-Thermal and Std ThermalB - Non-Thermal and Std ThermalColorRaw Aluminum in ColorRaw Aluminum in ColorRaw Aluminum in ColorDescriptionFan ClutchesFan ClutchesFan ClutchesDrawing TypeBBBDuty RatingStandardStandardStandardElectronic Clutch?Non ElectronicNon ElectronicNon ElectronicFan Bolt Circle IN3.2533Fan Mount Dia. IN2.622.372.37Fan Mount Height IN1.093751.41.75MaterialAluminumAluminumAluminumMeets / Exceeds OEM?YesYesYesMount Dia. IN2.322.332.33Mount Hole Qty444Mount TypeFlangeFlangeFlangeMounting Hardware?Not IncludedNot IncludedNot IncludedNew or RemanNewNewNewO.E. Replacement?YesYesYesOverall Dia. IN7.27.27.2Overall Height IN2.6718752.9843753.296875Performance Rated?YesYesYesPilot Depth IN0.560.750.75Pilot Dia. IN0.75.63 to .75.63 to .75RotationStdStdStdStyleSTANDARD DUTYSTANDARD DUTYSTANDARD DUTYTypeThermalThermalThermalWire GuageUses Original Equipment ConnectorUses Original Equipment ConnectorUses Original Equipment ConnectorWire QuantityUses Original Equipment ConnectorUses Original Equipment ConnectorUses Original Equipment ConnectorSource
http://fepower.net/simplemachinesforum/index.php?topic=1179.msg10220#msg10220

Frankenford did reference a stud and nut for attaching since there was not enough room for a bolt.

I bought the Hayden 2711 for mine about 2 months ago from Rock Auto with the thought of using a fan I had already. Turns out the fan is too large a diameter for the factory shroud, so I will be buying an 18"  version, Derale 17118, of the fan you listed from Summit. Wasn't till today I realized that both have the a dual bolt pattern for the clutch, or I would have went with the Hayden 2765.

That Hayden 2765 looks similar but it has a 3.25 bolt circle for the flange that mounts to the water pump, whereas the ford water pump has a 3" bolt circle.  Be careful about the fan - as far as I can tell the shrouds are made for a 17" fan and my shroud and 17" fan had about 1/2" clearance all around.
 

Yeah you're right - don't know what I was thinking.

Yep,the clutch has seen better days.
I need to buy a new one for my mustang.
It's a T5 transmission.
In it now is a ford motorsports clutch,and it done a good job this year.
What do ya'll suggest?
Pro's and con's please.

jkordzi

Thanks for this very informative thread jkordzi....your info is exactly what I'm looking for....see>>
https://fyi.boardhost.com/viewtopic.php?id=9459

I'll be referring to this as progress moves forward.

MS wrote:

Careful on those derale fans with two bolt patterns. See Bullet Bob’s post on the custom hood scoop hole created by the derale fan that blew apart. If you look carefully at the extra bolt holes, they form a perfect place for the fans to start flexing until they ultimately come apart. It is apparently a defective design with known problems.

Thanks MS...I did speak (communicate, wrote??) w/ Bullet Bob on that. I sure as ..hel_...I mean heck, will stay away from that brand. Prefer a nice heavy steel thingie with lot's of blades...chrome would be neat as I did get that car for it's bling.

MS wrote:

Careful on those derale fans with two bolt patterns. See Bullet Bob’s post on the custom hood scoop hole created by the derale fan that blew apart. If you look carefully at the extra bolt holes, they form a perfect place for the fans to start flexing until they ultimately come apart. It is apparently a defective design with known problems.

As I indicated, the the only standard rotation 17" clutch fans I could find were a Derale 17117 and a Flex-a-lite 6717.  The Flex-a-lite has a limit of 4,000 rpms like a lot of other aluminum bladed fans.  The Derale is steel blades riveted to a steel hub and has a 8,000 rpm limit.  Considering it's mounted to a clutch, I doubt it'll ever come close to that limit.  I searched a number of reviews and forums and only saw the one youtube video claiming a failure.  Other fans have come apart and a clutch fan is obviously is not a racing application .... but if there's a better clutch fan alternative I'd like to know about it.
 

Last edited by jkordzi (4/03/2019 3:56 PM)