No fan clutch, does it matter?

Moderator: Mod Squad

240 resto-mod
Registered User
Posts: 37
Joined: Mon Aug 21, 2017 8:59 pm

No fan clutch, does it matter?

Post #1 by 240 resto-mod » Thu Nov 02, 2017 12:42 am

In 1970, did ford use a fan clutch on the 240? Mine does not have one. I know the later 300's had them. Would it save any mpg/hp installing one. What years will interchange.? Also, how will the clutch activate? Electric or Tstat? Thanks

User avatar
Haywood
Registered User
Posts: 86
Joined: Tue May 09, 2017 10:35 pm
Location: Texas

Re: No fan clutch, does it matter?

Post #2 by Haywood » Thu Nov 02, 2017 6:48 am

The stock one is thermal, and you are giving away a lot of HP. I'm going to just go electric, when I have some time to tinker. Does open another can of worms though, as most of the stock alternators are barely adequate. The 3G upgrade solves this. Here is a video of testing fans on a dyno:
https://youtu.be/ZXdLgaFXZzs

User avatar
bubba22349
Global Moderator
Posts: 7328
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: No fan clutch, does it matter?

Post #3 by bubba22349 » Thu Nov 02, 2017 8:19 am

No clutch fans were ever used on a stock on a 240, that I know of. In a straight comparison of a standard fixed fan versus a clutch fan yes it dose matter. A clutch fan uses less power to turn it and getting one off a later model 300 or some other Ford engine (pre surpenetine belt drive) can be a bolt on. Good luck :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5045
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: No fan clutch, does it matter?

Post #4 by THE FRENCHTOWN FLYER » Thu Nov 02, 2017 8:31 am

From a best-bang-for-the-buck a clutch fan and a low restriction exhaust system are the two things at the top of my list. Not as romantic as a cam or pistons or shiny valve cover but that's where I would start.

I once ran a back-to-back dyno test on a Modular V8 with no fan vs a clutch fan vs locking it to the pump so nothing was changed except the clutching action of clutch. With the clutch: 1.5 hp loss; with the clutch locked on: 14 hp loss. Admittedly, the Modular V8 has a fan just a little smaller than an Osprey propeller but when you consider the road load hp needed to send the average pickup sailing down the highway is around 20 hp the improvement is significant.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

takehikes
Registered User
Posts: 51
Joined: Tue Nov 10, 2015 4:33 pm

Re: No fan clutch, does it matter?

Post #5 by takehikes » Mon Nov 06, 2017 1:18 pm

If you go electric fan what CFM would we typically look for....(stock 240)?

I have put a much larger radiator in and its working great but would love to dump the parasitic loss from the fan.

User avatar
Haywood
Registered User
Posts: 86
Joined: Tue May 09, 2017 10:35 pm
Location: Texas

Re: No fan clutch, does it matter?

Post #6 by Haywood » Mon Nov 06, 2017 4:18 pm

takehikes wrote:If you go electric fan what CFM would we typically look for....(stock 240)?

I have put a much larger radiator in and its working great but would love to dump the parasitic loss from the fan.


Not sure of the CFM, but the Taurus twin fans seem to be a popular choice. I'm going for an 07 Mustang GT fan because it was free. :D

240 resto-mod
Registered User
Posts: 37
Joined: Mon Aug 21, 2017 8:59 pm

Re: No fan clutch, does it matter?

Post #7 by 240 resto-mod » Mon Nov 06, 2017 6:45 pm

I purchased a fan clutch today, I went with a thermal unit. They also sell a non-thermal clutch, im assuming that is a centrifugal. I thought about going with the electric fan, but that’s to many modifications for me. I’ve also read that the difference between an electric fan and a clutched fan is only 1hp. But, that may depend on the climate where you live. Colder runs less, hotter runs more.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5045
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: No fan clutch, does it matter?

Post #8 by THE FRENCHTOWN FLYER » Tue Nov 07, 2017 7:29 am

You'll also notice a significant reduction in engine bay noise.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

takehikes
Registered User
Posts: 51
Joined: Tue Nov 10, 2015 4:33 pm

Re: No fan clutch, does it matter?

Post #9 by takehikes » Tue Nov 07, 2017 1:30 pm

I bought a fan clutch (thermal) from Napa but it wouldn't work with the stock 1968 fan. Returned it.
I'm trying to quiet the truck, keep it cool (though no problems with that) and gain a bit more power so electric just seems to make sense.
I put in a Champion radiator that is for the V-8 and its working great (new water pump and thermostat, hoses, belts too). They sell a dual 12" electric fan setup with thermostat control and relays for $120 which I think is pretty reasonable. Probably go that route.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5045
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: No fan clutch, does it matter?

Post #10 by THE FRENCHTOWN FLYER » Tue Nov 07, 2017 5:02 pm

Wouldn't a new aftermarket fan that fits the clutch be cheaper?
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

takehikes
Registered User
Posts: 51
Joined: Tue Nov 10, 2015 4:33 pm

Re: No fan clutch, does it matter?

Post #11 by takehikes » Tue Nov 07, 2017 6:21 pm

Yup it would.....quit telling me things like that! LOL

User avatar
Haywood
Registered User
Posts: 86
Joined: Tue May 09, 2017 10:35 pm
Location: Texas

Re: No fan clutch, does it matter?

Post #12 by Haywood » Tue Nov 07, 2017 6:34 pm

takehikes wrote:I bought a fan clutch (thermal) from Napa but it wouldn't work with the stock 1968 fan. Returned it.
I'm trying to quiet the truck, keep it cool (though no problems with that) and gain a bit more power so electric just seems to make sense.
I put in a Champion radiator that is for the V-8 and its working great (new water pump and thermostat, hoses, belts too). They sell a dual 12" electric fan setup with thermostat control and relays for $120 which I think is pretty reasonable. Probably go that route.

I think the reason the junkyard Taurus & Mustang fans are usually used is durability. They were designed for trouble free driving for 100's of 1000's of miles. The aftermarket is more of a crap shoot, though I'm sure there are some bullet proof aftermarket setups, it is hard to beat the OEMs on fans.

Harte3
VIP Member
Posts: 2547
Joined: Sat Oct 21, 2006 9:17 pm
Location: Spokane, WA

Re: No fan clutch, does it matter?

Post #13 by Harte3 » Tue Nov 07, 2017 9:03 pm

F-250 Restorer has done quite a bit of work with electric fans. Do a search here and on the FTE Forum for his excellent write-ups and photos.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

240 resto-mod
Registered User
Posts: 37
Joined: Mon Aug 21, 2017 8:59 pm

Re: No fan clutch, does it matter?

Post #14 by 240 resto-mod » Wed Nov 08, 2017 4:53 pm

Ok, so this is what I came up with. No one laught! Haha. So I took the 18in 4 blade fan that was oem to the truck and I retrofitted it to fit the new clutch. I used a hole saw to cut the center to 2 1/2, then drilled 4 holes to mount the fan. How close should the clutch be to the radiator? I may need a spacer.
You do not have the required permissions to view the files attached to this post.

240 resto-mod
Registered User
Posts: 37
Joined: Mon Aug 21, 2017 8:59 pm

Re: No fan clutch, does it matter?

Post #15 by 240 resto-mod » Wed Nov 08, 2017 8:48 pm

F7354922-A3DF-489F-A80A-7F799C4C207B.jpeg
You do not have the required permissions to view the files attached to this post.

takehikes
Registered User
Posts: 51
Joined: Tue Nov 10, 2015 4:33 pm

Re: No fan clutch, does it matter?

Post #16 by takehikes » Mon Nov 13, 2017 9:56 am

Perfect! Solves it completely....good job.

User avatar
bubba22349
Global Moderator
Posts: 7328
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: No fan clutch, does it matter?

Post #17 by bubba22349 » Mon Nov 13, 2017 7:47 pm

240 resto-mod wrote:Ok, so this is what I came up with. No one laught! Haha. So I took the 18in 4 blade fan that was oem to the truck and I retrofitted it to fit the new clutch. I used a hole saw to cut the center to 2 1/2, then drilled 4 holes to mount the fan. How close should the clutch be to the radiator? I may need a spacer.


:beer: Nice job dose the fan run nice and true? A Fan can be 1 inch from the radiator core or better still if you can find a factory radiator shroud or make one then the fan blades should be about centered half way into the stroud for best cooling. Good luck :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

240 resto-mod
Registered User
Posts: 37
Joined: Mon Aug 21, 2017 8:59 pm

Re: No fan clutch, does it matter?

Post #18 by 240 resto-mod » Mon Nov 13, 2017 10:29 pm

Yes the blades run very true. The hardest part of doing this, is centering the hole saw. I drilled a 1/4 in hole in a scrap piece of metal, then clamped the fan in the ceter of the scrap piece. A 2 and 7/16 hole would work better than the 2 1/2 that i used. The engine is noticeably quieter, can feel a slight hp gain. The engine temp remains normal. I havent felt the fan ingage yet, but in MT 0°to 40° recently. Now i need to make a shroud, or find one in a junk yard.

Harte3
VIP Member
Posts: 2547
Joined: Sat Oct 21, 2006 9:17 pm
Location: Spokane, WA

Re: No fan clutch, does it matter?

Post #19 by Harte3 » Tue Nov 14, 2017 2:50 pm

I wouldn't worry about a shroud. The one that came on my truck has been long gone for years and it has never had a heating problem. It wasn't really a shroud so much as it was a curved guard across the top of the radiator.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

takehikes
Registered User
Posts: 51
Joined: Tue Nov 10, 2015 4:33 pm

Re: No fan clutch, does it matter?

Post #20 by takehikes » Tue Nov 14, 2017 2:58 pm

Less noise? More HP? Exactly what I'm looking for!

User avatar
Haywood
Registered User
Posts: 86
Joined: Tue May 09, 2017 10:35 pm
Location: Texas

Re: No fan clutch, does it matter?

Post #21 by Haywood » Tue Nov 14, 2017 6:43 pm

Perfect, hotrodding at its finest; make what you've got, do what you need it to do. :thumbup:

Who is online

Users browsing this forum: No registered users and 18 guests