GM 7 blade fan vs Metal flexalite fan. Whats the better buy - Team Camaro Tech
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post #1 of 21 (permalink) Old Jan 15th, 08, 03:41 PM Thread Starter
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GM 7 blade fan vs Metal flexalite fan. Whats the better buy

I got ahold of the GM dealer and they can get a 19in 7 blade fan for $ 76.00 and summit has flexalite 19in 6 blade fan for 26.95 . Is the gm 7 blade worth the extra 50 bucks or is there even a better buy then these. I just want the best bang for my little bucks.
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post #2 of 21 (permalink) Old Jan 15th, 08, 04:33 PM
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Mark
 
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

19" blade won't fit in an 18" stock radiator shroud. Incase you have a stock setup.

Flexalite fans don't move near the air a GM fan moves.

Mark Canning
1969 Indy Pace Car
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post #3 of 21 (permalink) Old Jan 15th, 08, 05:48 PM
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David
 
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

I've got a Flexalite fan on my 69 with a 468 and have no cooling issues whatever. 468 idles in traffic at 185 all day long with the Flexalite fan.

"All I need is a fast machine". Steve McQueen
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post #4 of 21 (permalink) Old Jan 16th, 08, 08:49 AM
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Tom
 
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

stock clutch fans out perform in cooling and less HP drag than flex fans.

If flexfans were better, wouldn't the car companies installed them in the first place? They are sure cheaper to make.

71 Camaro 355 NA
11.1650 @ 119.30
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post #5 of 21 (permalink) Old Jan 16th, 08, 11:00 AM
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Steve
 
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

Flex fans..
Why spend your horsepower flexing blades when they should be moving air?

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.
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post #6 of 21 (permalink) Old Jan 16th, 08, 08:20 PM Thread Starter
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

Does autozone or kragen stock 7 blade gm fans?
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post #7 of 21 (permalink) Old Jan 17th, 08, 06:11 AM
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

No. But they would likely carry the thermostatic fan clutch that you need with the GM fan; it cannot be used without the clutch. And the clutch is another $50 or so.

If you want to run a flex fan because you don't want to spend $130 or so on the GM fan and clutch, that's okay. Just measure and get what you need, and make sure you get a fan spacer to properly position the fan in the shroud (you can't just bolt the $26 flex fan to the water pump pulley and call it good...).

Eric
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post #8 of 21 (permalink) Old Jan 17th, 08, 06:25 AM
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

Or keep watching ebay...

http://cgi.ebay.com/ebaymotors/1970-...spagenameZWDVW

Eric
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post #9 of 21 (permalink) Old Jan 17th, 08, 06:37 AM
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

Here's info on what your 70 had on it originally.

http://www.nastyz28.com/2gcog/cooling.html

I see you're running a 400 SBC; I would want to make sure any 400 is very well cooled.

Eric
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!
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post #10 of 21 (permalink) Old Jan 17th, 08, 07:33 AM
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Tom
 
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

Quote:
Originally Posted by life4christt View Post
Does autozone or kragen stock 7 blade gm fans?
GM does sell the fans. Be friendly with the parts dept, the discounts and their resources are invaluable over the many years of car addiction.

71 Camaro 355 NA
11.1650 @ 119.30
1.5028 60'
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post #11 of 21 (permalink) Old Jan 17th, 08, 08:53 AM
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

I used a Hayden #2707 thermostatic fan clutch with a Hayden #3618 six blade fan in my 67. The whole setup is available from partsamerica.com (Kragen) for about $60.


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post #12 of 21 (permalink) Old Jan 17th, 08, 09:00 AM
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

The Hayden standard duty fan clutch for 70 Camaro (long water pump) is #2705. If you have a short water pump, you can use the number Steve posted.

Eric
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post #13 of 21 (permalink) Old Jan 19th, 08, 11:30 PM Thread Starter
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

what is the difference between thermostatic fan clutch and non thermostatic fan clutch?
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post #14 of 21 (permalink) Old Jan 20th, 08, 02:47 AM
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Steve
 
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

The non-thermostatic clutch hubs are rpm activated, and found mainly in light trucks.
You're better off with the OE thermostatic type.

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.
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post #15 of 21 (permalink) Old Jan 20th, 08, 06:08 AM
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Re: GM 7 blade fan vs Metal flexalite fan. Whats the better buy

On the flex fan thing, the ability of the blades to flex and flatten at higher rpms causes them to consume LESS power (at higher rpm) than a fixed blade fan that can move the same amount of air at idle speed.

Of course at least in theory, the clutch in the clutch fan does the same thing.

I've heard that the flex-a-lite fans, at least the cheaper ones, were less than good.

I've used a 17" Derale flex fan for many years. It works really well for me. It keeps the motor cool and it's quiet, and it has held up very well. Cost was just less than $50 I think.

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