How close is to close?

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almost looks like that WP pulley is causing some troubles, if its thick where the fan sits it could be pushing it out some, also I think you can get stub nose water pumps
 
I would say its no thicker than a 1/8". Although I have not mic'ed it out.

I've thought about the shorter water pump, but then I have to try to find a matching pulley and that may be just as difficult.

I did find a low-profile electric fan, that would fit with enough room. But how much air should be moved by the fan? I have no idea
 
Well, you could go to a straight fan for now. I run a straight fan and have no issues. I "think" it's a seven blade.
 
Bad Sport said:
Well, you could go to a straight fan for now. I run a straight fan and have no issues. I "think" it's a seven blade.
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Really? I've heard rumors that they cant hold up to spinning at full engine RPM and could destroy themselves and your car, if they let go. Hence why you should run a clutch.
 
I have 3/8 to 1/2 inch clearance between my fan clutch and my radiator and have had no problems.
 
straightlinespeed said:
So curious, does anyone have any CFM fan recommendations for electric fans? Or at least a very minimum?
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the thin fans aren't rated for much (under 2000 CFM) the ford tarus fan is a popular upgrade when you have enough room (not A body)

they create 3300 CFM
 
inertia said:
That Jag clutch at 3/4" would be fine,, seen lotsa breeds with fans closer...

hope it helps
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Well its a cheap option.

I went out to the car and took the fan clutch off the car. I was then able to get a exact measurement from the front of the pulley to the radiator. 3-1/8". The Jag clutch is 2.67" that only leaves me with .455" between that clutch and the radiator. I still fear that, that is still to little of room.

I know of another guy that has this same radiator on here so Im going to ask him to get me a measurement from the brackets to the front and back of the radiator. I just wonder if mine was welded in the wrong spot, (to far back)
 
just get rid of the clutch fan, sell it

400-1719 19" ALUMINUM RACE FAN 45.99 from Jegs
This model features rigid aluminum blades on a steel star. These fans need less clearance, as the blades will not flex toward the radiator.
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that's what hemidenny used on his swap with the griffin aluminum rad
 
although everybody says not to use them i think there are flex fans rated to 8000 rpm.
 
Well Damn it! I picked up the Jag clutch and I only gained a 1/4". I now have a 1/2" of room, which Im still not comfortable with. I spoke with Motopsycho (Eddie) on the phone, because his car is very similar to mine. The only difference is he has a 73up K-member and mine is 72down. He has 1" of clearance. Im not sure if that make the whole difference or what but its all I can come up with.

View attachment IMG_20140319_183934_551.jpg

View attachment IMG_20140319_183923_921.jpg

As for using the fan with out a clutch Im not to comfortable doing this, I have heard of to many horror stories. Now whether they are true or not I dont know, but I would rather not risk it.

Now what I have found for electric fans is a 17" dual speed fan, that operates at 1700/2100 cfm. Is that enough cfm, I dont know. But only gives me, a 1/2" clearance between the fan and the pulley. Pretty much the same situation Im in now. I also found a perma-cool 10" fan that claims to move 2350cfm each. I can get a shroud made that will allow me to run 2-10" fans, which would be offset to the corners and then allow me to have 1" of clearance from the shroud to the pulley. Sadly, I think this is the option I have to go with.
 
Have used Spal electric fans in the past with good success....
 
Is that a Mach water pump pulley? If it is a Mach pulley, it is thicker at the mounting base. Try using a stock pulley. The stock pulley is much thinner at the mounting base. You will gain some clearance.
 
68 340 said:
Is that a Mach water pump pulley? If it is a Mach pulley, it is thicker at the mounting base. Try using a stock pulley. The stock pulley is much thinner at the mounting base. You will gain some clearance.
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Its not a March, but very similar. Yes you are correct, the mounting flange is much thicker than the stock pulleys. I believe this is close to 3/16-1/4" thick. I dont have any stock pulleys, that is why I went to this set up. I have thought about getting a set of stock pulleys.
 
Mancini sells the stock pulley in black or chrome. They are thin at the base. You will pick up a 1/4 inch in clearance. I have the jag clutch with stock pulley on my setup. I have 1 inch clearance. I use a custom shroud and the fan is half in and half out. Perfect setup. I run 180 degree temps in 90 degree weather.
 
I have a stock dual groove pulley. If you want to use it to evaluate clearance with your setup, let me know.
 
I know this is close, as I mentioned we picked this fan assmbly at a swap meet, and my son's been driving the snot outta this thing for 2 yrs,, power shifts and all the goofy things kids do..

It worked for us,, last pic is a peek of the chain I mentioned earlier to prevent the engine moving forward on abrupt stops..

hope it helps..

PS that's a new copper rad ..
 

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