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Old 10-04-2008, 10:29 PM   #1
Critter
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Electric fan

How much air flow (CFM) would I need if I removed my stock fan and used an electric setup. Condidering I have a mild build 350 with A/C in South Texas heat.
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Old 10-05-2008, 06:14 AM   #2
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Re: Electric fan

All you can get.

Pulling air through is better than trying to push it through.
(don't know how you intend to mount though)
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Old 10-05-2008, 07:33 AM   #3
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Re: Electric fan

I had an aluminium be cool radiator, and 2, 11" Spal fans on my 502 Chevelle, and it would keep up with Florida summers. 3/4 up the gauge. If you go to www.spal-usa it will show CFM ratings. I think this is a case of more is better. Currently own a 69 SWB, and will be installing A/C soon. I am thinking about the 12" dual spal's, and their fan controller. I have a 4 row copper/brass radiator in my truck now, and with no A/C it does just fine

Last edited by cparman; 10-05-2008 at 07:34 AM. Reason: typo
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Old 10-05-2008, 07:57 AM   #4
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Re: Electric fan

...a shroud is key also.
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Old 10-05-2008, 08:30 AM   #5
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Re: Electric fan

There was an electric fan install in the truck section a while back. The setup was from a late model Jeep. I am thinking about giving it a try.http://67-72chevytrucks.com/vboard/s...d.php?t=254617 I finally got the link to work.

Last edited by 1972CST; 10-05-2008 at 08:38 AM.
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Old 10-05-2008, 01:06 PM   #6
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Re: Electric fan

Quote:
Originally Posted by vtblazer View Post
All you can get.

Pulling air through is better than trying to push it through.
(don't know how you intend to mount though)
I am wanting to pull the air. (unless someone gives me a good reason otherwise) I have been seeing alot of single and dual fan "kits" that come with shrouds. Most of them will have 2 or 3 different options based on CFM flow. I want to make sure I get an adequate kit, but at the same time I didn't want to spend twice the amount of money on something inteded for a bigblock race engine and it be overkill for my setup. I guess in this case too much air is WAY better than not enough.

I have seen formula that tell you how to calculate CFM using HP, A/C and radiator dimentions and material. I just can find them right now.

Quote:
Originally Posted by 1972CST View Post
There was an electric fan install in the truck section a while back. The setup was from a late model Jeep. I am thinking about giving it a try.http://67-72chevytrucks.com/vboard/s...d.php?t=254617 I finally got the link to work.
I have always liked this setup, read about it when he originally posted. I might try to go this route. It seems to handle the job pretty well.
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72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts
2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver

Check it out www.lsdyno.com
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Old 10-05-2008, 03:06 PM   #7
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Re: Electric fan

with my last car, I started with one 16" fan. would not keep up with Fla. heat, and was very noisy. The dual 11" kept up on all the the very hot days, and was way quieter. I drive my 67 Chevelle, zz502, 700r4 ETC. to the Googuys show 2 years ago, and the heat index was 110. Driving from downtown Jacksonville to my home at the beach, the guage was a bit over 3/4. made me uncomfortable. I think that unless you are running a bunch of motor 2 11" or 12" would keep up just fine with Texas heat.

Last edited by cparman; 10-05-2008 at 08:21 PM.
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Old 10-05-2008, 08:35 AM   #8
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Re: Electric fan

71 rat did a good thread on a Chrsyler/ Jeep fan install, stock fan and it bolts rite into our stock shroud. I ended up buying his, so I will post up pics when I get it. The unit new sells for about 50, but I don't know the cfm's.

CST and I must have typing at the same time
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Last edited by jaros44sr; 10-05-2008 at 08:36 AM.
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Old 10-05-2008, 08:42 AM   #9
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Re: Electric fan

Thats what I was thinkin. I called my local dealer and they said it would be against the law for them to sell me a "recalled" part. I am not trying to buy the take-off fans, I want a brand new one.

Where did you get yours jaros44sr?

Last edited by 1972CST; 10-05-2008 at 08:44 AM.
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Old 10-05-2008, 09:28 AM   #10
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Re: Electric fan

Quote:
Originally Posted by 1972CST View Post
Thats what I was thinkin. I called my local dealer and they said it would be against the law for them to sell me a "recalled" part. I am not trying to buy the take-off fans, I want a brand new one.

Where did you get yours jaros44sr?
I got mine w/shroud from 71Rat, there was a web site with thread to Chrysler site, and guys were buying thru that

Thread is titled...another cheap electric fan build
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Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training
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Last edited by jaros44sr; 10-05-2008 at 09:37 AM.
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