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Clutch Fan Questions

Posted By Florida_Phil 8 Years Ago
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Florida_Phil
Posted 8 Years Ago
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My 1955 Thunderbird does not overheat, but I am tired of the noise from the solid fan.   Can I replace the 6 blade solid fan with a clutch fan without issues?


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GREENBIRD56
Posted 8 Years Ago
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Hayden makes a fan clutch that fits well on the T-bird - due to the extra space ahead of the engine. Hayden #2797
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Make sure your fan blades clear the shroud correctly. This is an aluminum 7 blade from a GTO - but a six blade will do the job.


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 Steve Metzger       Tucson, Arizona
DANIEL TINDER
Posted 8 Years Ago
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Got mine from CASCO. Works fine.

6 VOLTS/POS. GRD. NW INDIANA
Florida_Phil
Posted 8 Years Ago
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Thanks for the reply.  I currently have a six blade solid hub fan. Sounds like a windmill!  The Hayden #2797 clutch is available from a number of sources.  Do you know what diameter clutch fan blade would fit my '55 Bird?   Larry's sells the stock 17" fan.  Should I buy a 17" or 18" clutch fan blade?  What is the optimal distance for the blades to the radiator or shroud?


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GREENBIRD56
Posted 8 Years Ago
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Mine is an aluminum 7 blade cut down to 18 inches. Halfway out of the shroud is a decent target to shoot for. As far as the Hayden clutches go the Heavy Duty (p/n 2747) and the Severe Duty (p/n 2797) both fit - the 2747 requires a little sleeve / spacer to decrease the pilot fit to 5/8's. The Severe Duty is the best choice in my opinion - it has a much larger clutch area and the pilot is direct fit for the 'Bird.

 

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 Steve Metzger       Tucson, Arizona
Florida_Phil
Posted 8 Years Ago
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Thanks Steve.  My current fan is 18".  I'll buy the 2797 and an 18" clutch fan blade.  My car is a 3 speed manual with O/D.  It will be nice to hear the motor instead of all that noise in first gear.


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GREENBIRD56
Posted 8 Years Ago
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Just be sure to take a good look at the "pitch" of the blades of fan you choose - they differ. The viscous clutch style fan drive loses about 10% of the rpm available due to slippage. If your hot idle is low - and you only get 90% speed - and the water pump speed is low as well - a "flat" fan can cause you a problem.

The one in my photo above is a Pontiac (GM) aluminum, 7 blade with a rather heavy pitch - cut down to size. Just one way of dealing with the problem ...... there are others.

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 Steve Metzger       Tucson, Arizona
miker
Posted 8 Years Ago
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Based on Steve’s comments and my experience in truck/RV installations, you might start by looking at those fans. They’ve got a lot of pitch to move air under heavy loads at moderate rpm and lower road speeds. Anyone who’s driven a large gasoline RV up a hill knowns the roar that happens when clutch locks up to start moving air. I probably wouldn’t buy the most aggressive, but it would be worth a look to compare them to auto applications. Or like Steve’s, a hp big block application with air and power accessories.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ
oldcarmark
Posted 8 Years Ago
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GREENBIRD56 (10/26/2017)
Just be sure to take a good look at the "pitch" of the blades of fan you choose - they differ. The viscous clutch style fan drive loses about 10% of the rpm available due to slippage. If your hot idle is low - and you only get 90% speed - and the water pump speed is low as well - a "flat" fan can cause you a problem.

The one in my photo above is a Pontiac (GM) aluminum, 7 blade with a rather heavy pitch - cut down to size. Just one way of dealing with the problem ...... there are others.

Hey Steve. Do You have a Part # for that Fuel Filter you have on your's? Or an Original Application?

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GREENBIRD56
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Its an AC Delco GF62 - I don't know if this exact style is still around. At one time they were Corvette parts. The Ford branded canisters usually come from Mustang restoration outfits.
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 Steve Metzger       Tucson, Arizona


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