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WHAT IS THE BEST CLUTCH FAN #141953
10/26/08 08:14 PM 10/26/08 08:14 PM
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Nick Mineau Offline OP
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Hi
im wondering what is the BEST clutch fan that will fit in a b body shroud and where can i find it. i need some serious colling. the largest fan that can fit is about 19.25 inches. thanks


the one i have currently doesnt make that ROAR like the real good ones.
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141954
10/26/08 08:26 PM 10/26/08 08:26 PM
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Eagle, Idaho
Neil Offline
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The last time I was at the wrecking yard looking at the dodge truck and van row (70's thru 80's) and I noticed that some of the fans on them have a lot bigger blades than the 60's cars ever came with.

You don't want to cut it too close with the gap between the shroud and the outer part of the blade because engines do move around a little with the rubber engine mounts.
Re: WHAT IS THE BEST CLUTCH FAN [Re: Neil] #141955
10/26/08 08:29 PM 10/26/08 08:29 PM
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Nick Mineau Offline OP
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yea, i have looked at late 80's fans from vans but their 1 inch too big. mabe the 70's fans are a little smaller
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141956
10/26/08 08:41 PM 10/26/08 08:41 PM
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Snowing in the north!
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Dart 340 Offline
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If you need serious cooling, the fan is not going to do it. It won't do much of anything for you when your driving down the road.

I'd throw in a better radiator. I dropped my temps
by 50 degrees!
Re: WHAT IS THE BEST CLUTCH FAN [Re: Dart 340] #141957
10/26/08 08:48 PM 10/26/08 08:48 PM
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Nick Mineau Offline OP
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so what your saying is that if im getting hot driving down the highway its not the fan at ALL?
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141958
10/26/08 09:07 PM 10/26/08 09:07 PM
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Eagle, Idaho
Neil Offline
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Not having a spring in the lower radiator hose can cause an engine to run hot.
Re: WHAT IS THE BEST CLUTCH FAN [Re: Neil] #141959
10/26/08 09:18 PM 10/26/08 09:18 PM
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Nick Mineau Offline OP
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the lower radiator hose is just a universal with a coil to avoid kinking when bending
. could this be the problem?
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141960
10/26/08 09:27 PM 10/26/08 09:27 PM
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Eagle, Idaho
Neil Offline
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You need to have a metal spring inside the hose. If you already have one then it's likely something else.
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141961
10/27/08 03:14 PM 10/27/08 03:14 PM
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Harrisburg, Pa.
screamindriver Offline
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Quote:

so what your saying is that if im getting hot driving down the highway its not the fan at ALL?

Is it a clutch fan now ???I had the clutch go bad on a fan a few summers ago and the fan freewheeled and created enough of a blockage to have the temp creep up on me cruizing down the highway...If it's a clutch fan reach in there and give it a spin...If it spins freely you've found your problem....
Re: WHAT IS THE BEST CLUTCH FAN [Re: screamindriver] #141962
10/27/08 03:56 PM 10/27/08 03:56 PM
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get a stock thermo clutch fan from napa or parts store of your choice

I bumped my 5 blade fan up to a 7 blade fan from a mid 80s AMC Hornet

make sure you got the right size pully on the water pump also

in my case I removed the A/C and cond.from the truck

got a new clutch,added the 7 blade fan,replaced the rad with a 3 core max cooling replacement

put a non A/C water pump pully and a wp with 8 vanes on the pump

the larger pully turns slow at idle so the 8 vane wp moves more water at idle

an A/C pully is smaller and turns faster at idle so the 6 vane wp will move more water at idle

with a sm wp pully and 8 vane pump you "could have cavatation at the water pump and cause damage" at high rpms

a good high flow thermo "robert shaw" type is a good help in controling flow and temps

and a good rad cap is something most need

the carb and timming can heat it up at cruz speeds also,so check you tune also
Re: WHAT IS THE BEST CLUTCH FAN [Re: scratchnfotraction] #141963
10/27/08 08:42 PM 10/27/08 08:42 PM
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Lee446 Offline
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The fan will aid your cooling whether you are going 20 mph or 80. When the fan is engaged, it pulls the air through the radiator. What would otherwise would be turbulent airflow, building up in front of the grill, gets a path through the radiator because the fan pulls it through. If you have ever done much towing, you would have noticed the difference. In hot summers pulling my car on the trailer at 65 mph, especially on grades, you will see the temp creeping up, when the clutch engages, you can hear it and watch the temp come down in minutes. While most cars cruising with no load will get enough air through the radiator for normal cooling with a malfunctioning or inefficient fan, our muscle cars need all the help they can get and directed flow is an important part of that.
Re: WHAT IS THE BEST CLUTCH FAN [Re: Lee446] #141964
10/27/08 09:31 PM 10/27/08 09:31 PM
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I used a core BB engine from a '78 Cordoba with a very aggressive 7 blade clutch fan. I'd look for one like it if that's what you need.

I agree with the post above - from experience. The big fan will help with cooling problems when stopped or moving slowly. If your engine won't cool off pretty fast at speeds above 35 MPH you've got other problems a big fan won't solve.

If a good cooling system starts running hot at speed it almost always means the radiator is getting plugged.

If you're starting from scratch with a new system, it may be an older plugged radiator or too small radiator causing the problem or something else... what are the symptoms?
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141965
10/27/08 09:44 PM 10/27/08 09:44 PM
Joined: Jul 2008
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Florida STAYcation
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Quote:




the one i have currently doesnt make that ROAR like the real good ones.




The ones that ROAR cost big-time horsepower to drive and are also RUFF on water-pump bushings/bearing and drive-belts.

If you are having low-speed low-rpm cooling probs ...you want a powerful electric puller fan. These operate at full-speed down-low where you need it.

PLUS ... there will be a definate mpg savings over ones that ROAR.
Re: WHAT IS THE BEST CLUTCH FAN [Re: ahy] #141966
10/27/08 09:59 PM 10/27/08 09:59 PM
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Nick Mineau Offline OP
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Quote:

I used a core BB engine from a '78 Cordoba with a very aggressive 7 blade clutch fan. I'd look for one like it if that's what you need.

I agree with the post above - from experience. The big fan will help with cooling problems when stopped or moving slowly. If your engine won't cool off pretty fast at speeds above 35 MPH you've got other problems a big fan won't solve.

If a good cooling system starts running hot at speed it almost always means the radiator is getting plugged.

If you're starting from scratch with a new system, it may be an older plugged radiator or too small radiator causing the problem or something else... what are the symptoms?



here is the symptoms. while running 55 on long hills towing a trailer temps rise slowely but shurly to 210. the fan clutch defently kicks on in traffic and brings temps down but on the highway doesnt seem to even come on. whats up with that. how do i fix it. brand new thermal hd clutch
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141967
10/27/08 10:15 PM 10/27/08 10:15 PM
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It sounds like you need more radiator. I drove and worked a D200 pickup for many years. The stock radiator was just big enough. When it started heating up loaded on long hills I knew it was time to rod out the radiator or replace it. That always worked.

A bigger fan won't help you. I'd find a good radiator shop, pull the radiator and have them look at it. If the prce is reasonable, have them replace the core, preferably with a thicker one (3 rows instead of 2 for example).

The other option is to buy a new high capacity radiator. I've had good results with the stock style aluminum radiator from Mancini. Its not the cheapest (nor the most expensive) but works well. Mancini will work with you to get the right size, outlets configuration, shroud, trans cooler ect. Stock replacement hoses fit on mine which is a benefit.
Re: WHAT IS THE BEST CLUTCH FAN [Re: ahy] #141968
10/27/08 10:39 PM 10/27/08 10:39 PM
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Nick Mineau Offline OP
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right know im running a 4 core radiator. what your saying makes sense but the reason i still am looking at the fan is because my fathers durango has a 5 blade fan and when he is towing it will kick on (at highway speeds). makeing alot of noise and colling the engine within 1 mineut. a new radiator is out of my price range although it would defently help. thanks

i really just am looking to know what CLUTCH fan blade is the best for colling this thing. not worried about drag. and 19.25 inch is the MAX. any sugestions would be helpfull. i dont even know what is on there just know it has 7 blades, is NOT stock equipment and makes very little noise when engauged and pulls way LESS air than my dads durango. about the same as my ford rangers little plastic clutch fan
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141969
10/27/08 10:58 PM 10/27/08 10:58 PM
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OK - '78 Cordoba BB is my vote for a doner. Its a big "cupped" 7 blade a little under 20". I'd send you one but the postage is probably more than what it would take to get one from a wrecking yard close by you.
Re: WHAT IS THE BEST CLUTCH FAN [Re: ahy] #141970
10/27/08 11:06 PM 10/27/08 11:06 PM
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Nick Mineau Offline OP
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Quote:

OK - '78 Cordoba BB is my vote for a doner. Its a big "cupped" 7 blade a little under 20". I'd send you one but the postage is probably more than what it would take to get one from a wrecking yard close by you.



did all of these cars have the same fan. if its just laying around and not to much trouble any way to get some meshurements. my shroud is exactly 20.5 inches. thanks
Re: WHAT IS THE BEST CLUTCH FAN [Re: Nick Mineau] #141971
10/27/08 11:26 PM 10/27/08 11:26 PM
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As close as I can measure its 19.5". Measuring across 7 blades is not exact.
Re: WHAT IS THE BEST CLUTCH FAN [Re: ahy] #141972
10/27/08 11:30 PM 10/27/08 11:30 PM
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Nick Mineau Offline OP
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thanks
ill go to the junk yard asap.
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