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  #1 (permalink)  
Old 12-29-2013, 04:43 PM
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Fan clutch

Hello all
Another dumb question !!!!

Do I really need a clutch on my fan? I have a bad space problem between the radiator and fan . There is no room for a clutch.
What are the pro and cons of not having one .
Thanks

Jeff

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Old 12-29-2013, 05:45 PM
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Without one all you will lose is a little HP and maybe lose a small amount on your MPG.
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Old 12-29-2013, 05:55 PM
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Quote:
Originally Posted by S10 Racer View Post
Without one all you will lose is a little HP and maybe lose a small amount on your MPG.
True. You may also notice quite a bit more noise.

John
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Old 12-29-2013, 06:35 PM
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I run electric fans,no water pump fan
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Old 12-30-2013, 05:02 AM
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Quote:
Originally Posted by jeffmc View Post
Hello all
Another dumb question !!!!

Do I really need a clutch on my fan? I have a bad space problem between the radiator and fan . There is no room for a clutch.
What are the pro and cons of not having one .
Thanks

Jeff
Just out of curiosity how much space do you have?
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Old 12-30-2013, 05:44 PM
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Do u gain any hp running electric fan versus a clutch ?
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Old 12-30-2013, 07:41 PM
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cooling

Quote:
Originally Posted by capeduece View Post
Do u gain any hp running electric fan versus a clutch ?
yes and no
when the fan is off yes
when the fan is on,the alternator draws more drag
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Old 12-30-2013, 08:25 PM
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Thanks that makes sense to me happy new year
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Old 12-30-2013, 08:34 PM
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I like to think loosing that big contraption frees up some rotational ease.

All that noise, yikes. Go electric.
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Old 12-31-2013, 03:04 PM
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Do you _NEED_ a clutch? no.
do you _WANT_ a clutch? yes.

like it was mentioned.. power, economy, and yes.. NOISE and lots of it..

and also like it was suggested, electric fans are the way to go.

this is my ultra low dollar electric fan setup

http://home.comcast.net/~kc8oye/Engine/DSCN1143.JPG

as you can see, space isn't a concern.. but I was having problems with cooling with the pos flex fan that was in there when I got the car, I was given the large electric fan (stock GM piece to something from the 80's) so I went straight to electric. I added the little 10" fan when I found the engine heat would tend to climb slowly when the air temps were really high (like 95 and higher)

as it happens, the big fan is a two speed.. and after playing around with different configs, I found the setup I liked the best, was that both fans turn on @ 190F with the big fan on low. the big fan comes on 'high' @ 200F
(I run a 160 t-stat, so this way, most of the time, the fans don't even come on unless I'm sitting still for a LONG time)
that big fan is REALLLY noisey on high, so I have it setup as an 'oh crap, it's getting hot'
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Old 01-01-2014, 08:49 AM
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There are several common challenges with converting to an electric fan:
- You need to figure out what fits, and often you need to fabricate some type of shroud to make it more effective. It sounds like you already have space problems, so you will need to take some careful measurements.
- Some of the most effective fans (e.g. the Lincoln Mark VIII electric) draw quite a bit of power, especially as they kick on. You need good quality relays and wiring.
- Specs on aftermarket fans are not that reliable. Every manufacturers quotes an air flow rate, but its difficult to compare them directly. Some relatively inexpensive fans work just as well as the very pricey ones.

Bruce
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Old 01-01-2014, 02:02 PM
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When I had my 34 truck it had an electric fan and it was on a toggle
switch. I would just keep an eye on the gauge , it had 180 thermostat and no hood , I never turned it on only if I sat more than 10 minutes . Worked for the 4 years I had it
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Old 01-01-2014, 03:03 PM
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Downside to running a clutch fan is that the fan only runs when you are moving slowly. As the rpms pick up the fan actually stops spinning or spins very slow. I never liked them because of the added weight on the pump snout. I have a better pitched 6 blade fan on my car and it spins all the time and does not make anymore noise than a clutched one would.
I also had a clutch fail on a fan years ago on the road......then you have problems.
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Old 01-01-2014, 04:06 PM
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Quote:
Originally Posted by sunsetdart View Post
Downside to running a clutch fan is that the fan only runs when you are moving slowly. As the rpms pick up the fan actually stops spinning or spins very slow.
Ah...

That's kinda the whole point of a clutch fan. It only engages the fan (and increases the noise and HP loss) when the fan is needed. Why is that a "downside"?

As for the weight of the fan, the load that the added weight of the fan puts on the water pump bearing is far less than the load from belt tension. Consider that pretty much any engine you would plan to run a clutch fan on came with one from the factory, so the water pump is already designed for it.
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Old 01-01-2014, 07:22 PM
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Sunset , that 50 Plymouth is a work of art. I see the time invested , very nice custom. People should click on it for a some inspiration.

I love that,

Mark
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