Viscous fan package?

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Larry Shepard and his bunch discovered the five blade fan moved more air because it breaks the air up more since the blades are offset. Similar to the external fans on a GM alternator. Each blade is a different size. If you've ever looked at one, you know what I am talking about. The Mopar fan achieves the same effect since it's blades are offset. I'm no physicist, but it makes sense. I have actually proven it. I replaced a seven blade symmetrical fan with a five blade non symmetrical MP fan and the car ran cooler. Some people argue that a clutch fan cannot move more than a fixed blade, but that's false. The MP viscous fan is thermostatically controlled. It has a bimetal spring on the front that expands as it heats up. The fan can and will achieve 100% lockup under a heavy load as temperatures increase. The advantage they have is, they don't ALWAYS move the most air they can as the clutch allows slippage which saves horse power and increases mileage. It also reduces wear and tear on the water pump. Those old guys weren't stupid.

AGREE ON THAT ABOUT THE OLD GUYS, BUT , THIS OLD GUY HAS ABOUT 8-10 DEGREES HOTTER RUNNING ENGINES W/ A CLUTCH FAN . d r caps
 
Thanks Jimacuda....someone saw this and hooked me up already.
Special thanks to fshd4it. An awesome member indeed.

Excellent. :thumbsup:

I've had a couple of those hanging around for years. :D
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I guess you are prepared for the zombie fan apocalypse. But at least you save something useful, not so much in my garage....

only if theyre viscous zombies:D

flex zombies are down another aisle:steering:


if you could zoom out in that picture youd see lots of "WTF am I saving this for?" toe stubbing, leg gouging masses of "crap, ive got to move that again"....ugh.:)
Lets not even go out behind the shop...no no...:eek:
 
amen to that , I cut down studs to use ----------

Bob, I am trying to put all the bolts in my Hayden 2947 fan clutch. It is more difficult than I even imagined. I had one bolt in for mock up before. I am trying your stud method now & that is even hard. Any other tips?
 
Bob, I am trying to put all the bolts in my Hayden 2947 fan clutch. It is more difficult than I even imagined. I had one bolt in for mock up before. I am trying your stud method now & that is even hard. Any other tips?
I use bolts on mine. It helps to just get the bolts started first - like a thread or two on each. That'll allow you to pull the clutch out in order to fish them all in. Then use an open end wrench and snug them all down one flat a time. It's a shitty process, but it can be done.
 
I use bolts on mine. It helps to just get the bolts started first - like a thread or two on each. That'll allow you to pull the clutch out in order to fish them all in. Then use an open end wrench and snug them all down one flat a time. It's a shitty process, but it can be done.
Yep. It's been described as "a real pain in the dick!" Pretty much sums it up.
 
It’s been said that the 5 blade moves the most air but if the 7 blade’s doing the trick why change it?
Interesting...When my 5-blade was destroyed by a General Lee-style crossing of some train tracks, I switched to a factory 7-blade and it pulls with noticeably more suction, at least just spinning at idle.
 
Bob, I am trying to put all the bolts in my Hayden 2947 fan clutch. It is more difficult than I even imagined. I had one bolt in for mock up before. I am trying your stud method now & that is even hard. Any other tips?

I didnt use studs this time , I used a hair longer grade 8 bolt w/ a flat washer .
I cut the lip off of the back of my clutch ,about .100 , wish I`d have gone another .20 or .030, that lip doesnt do anything , and is just extra mat`rl.
I still had to install one bolt ,"leave ''unscrewed'' a bunch, to set the clutch groove in , to help get the fan in position, and rotated it around ,starting all the bolts w/ it way loose , and had to use needle nose pliers to get it in position ,( I WAS DOING IT W/ BURNED FINGERS ON MY RIGHT HAND). If u tighten one to far, u cant **** the thing out enough to get all of them started. w/o cutting the lip off , I doubt I could have done this ,then it would be back to using the studs , u can cut carburator studs to the exact length < trial and error .
Cutting the back of the clutch can be done easy in a lathe , my lathe took quite a bit of imagination because it wasnt big enought to swing the clutch over the cross slide , I would recommend having it cut by a machinist , would be ''no big deal.''
HANG IN THERE , ITS STILL A ***** !----LOL
 
Interesting...When my 5-blade was destroyed by a General Lee-style crossing of some train tracks, I switched to a factory 7-blade and it pulls with noticeably more suction, at least just spinning at idle.

Well it seems the smaller pulley made about 5 degrees diff. , not sure, it was only in the mid 80`s but was humid as hell . Stiill wondering how much it will help in the mid to hi 90`s .
 
I didnt use studs this time , I used a hair longer grade 8 bolt w/ a flat washer .
I cut the lip off of the back of my clutch ,about .100 , wish I`d have gone another .20 or .030, that lip doesnt do anything , and is just extra mat`rl.
I still had to install one bolt ,"leave ''unscrewed'' a bunch, to set the clutch groove in , to help get the fan in position, and rotated it around ,starting all the bolts w/ it way loose , and had to use needle nose pliers to get it in position ,( I WAS DOING IT W/ BURNED FINGERS ON MY RIGHT HAND). If u tighten one to far, u cant **** the thing out enough to get all of them started. w/o cutting the lip off , I doubt I could have done this ,then it would be back to using the studs , u can cut carburator studs to the exact length < trial and error .
Cutting the back of the clutch can be done easy in a lathe , my lathe took quite a bit of imagination because it wasnt big enought to swing the clutch over the cross slide , I would recommend having it cut by a machinist , would be ''no big deal.''
HANG IN THERE , ITS STILL A ***** !----LOL

Bob, I got it in, what an ordeal. I cut off some bolts like u suggested and used red locktite to hold them in the waterpump. I took the bolts out of the fan so it would tilt out of the way a little & give me a little more room. That made it a lot easier. I couldn’t get a lock washer on it, so I hope it it will stay tight. Looks like the slots in the clutch might dig in to the nuts and help.

I have a 7 blade fan. Looks like it would be easier with a 5 blade fan since they are asymmetrical and there are bigger spaces between some of the blades.

Having a bag of nuts helped cut down on the swear words, since I didn’t have to get under the car every time to look for a nut. I bet I dropped 30 or 40 of them.

I made a shroud out of a Ford Explorer shroud, and it is two piece, so I can install it last. That was very helpful as well. Don’t need anything else in the way to make it harder.

Machining of that ridge is a great idea, but out of my skill range. I wonder if Hayden ever actually installed one of these?

Thanks again for the help!
 
Fantastic member fshd4it hooked me up with a 5 blade brand new in the box kit. Threw it on yesterday and tested it out for a few hours. That baby really moves some air. It’s hugely noticeable even at slow idle compared to the piece of crap flex fan that was on it. Constant cruising temp 182*, stop and go traffic drifts to 196* on an 86* day. No shroud yet but definitely considering it.

74A3FB51-E9BA-4C58-AF5C-6224BC50765F.jpeg
BF7D0CCE-9AE7-4697-807D-602CEB90BFEA.jpeg
 
Fantastic member fshd4it hooked me up with a 5 blade brand new in the box kit. Threw it on yesterday and tested it out for a few hours. That baby really moves some air. It’s hugely noticeable even at slow idle compared to the piece of crap flex fan that was on it. Constant cruising temp 182*, stop and go traffic drifts to 196* on an 86* day. No shroud yet but definitely considering it.

View attachment 1715542904 View attachment 1715542905

That’s close enough you don’t need a shroud.
 
Bob, I got it in, what an ordeal. I cut off some bolts like u suggested and used red locktite to hold them in the waterpump. I took the bolts out of the fan so it would tilt out of the way a little & give me a little more room. That made it a lot easier. I couldn’t get a lock washer on it, so I hope it it will stay tight. Looks like the slots in the clutch might dig in to the nuts and help.

I have a 7 blade fan. Looks like it would be easier with a 5 blade fan since they are asymmetrical and there are bigger spaces between some of the blades.

Having a bag of nuts helped cut down on the swear words, since I didn’t have to get under the car every time to look for a nut. I bet I dropped 30 or 40 of them.

I made a shroud out of a Ford Explorer shroud, and it is two piece, so I can install it last. That was very helpful as well. Don’t need anything else in the way to make it harder.

Machining of that ridge is a great idea, but out of my skill range. I wonder if Hayden ever actually installed one of these?

Thanks again for the help!

Dont know , I doubt it , got any pics of ur set up ?
I ran the nuts only ,till this last change , had no problem w/ it/them.
 
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