Electric fan - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Critter · 10-04-2008, 10:29 PM

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.

vtblazer · 10-05-2008, 06:14 AM

All you can get.

Pulling air through is better than trying to push it through.
(don't know how you intend to mount though)

cparman · 10-05-2008, 07:33 AM

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

vtblazer · 10-05-2008, 07:57 AM

...a shroud is key also.

1972CST · 10-05-2008, 08:30 AM

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.

**jaros44sr** · 10-05-2008, 08:35 AM

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

1972CST · 10-05-2008, 08:42 AM

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?

**jaros44sr** · 10-05-2008, 09:28 AM

Quote:

Originally Posted by 1972CST

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

Critter · 10-05-2008, 01:06 PM

Quote:

Originally Posted by vtblazer

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

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.

cparman · 10-05-2008, 03:06 PM

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.

cparman · 10-05-2008, 08:23 PM

hopefully here is a picture of what a mouth full 2 11" dual fans and a zz502 are in a 67 Chevelle
"

1972CST · 10-05-2008, 08:55 PM

Lets see the rest of the car!

Critter · 10-05-2008, 10:25 PM

Quote:

Originally Posted by 1972cst

Lets see the rest of the car!

no kidding!

vtblazer · 10-06-2008, 05:37 AM

Camaro fan, two position toggle (high/low), relay's, LED lights and a stock shroud.

Works great 75% of the time on low and is very quite, put it on high and you can watch the needle drop.

Used a old school ignition resistor to provide the 4.5 volts on low.

Fan draws 4.2 amps on low and 10.5 amps on high.

Burt4x4 · 10-06-2008, 09:46 AM

I have ran Flex-a-lite fans for years and have ahd good luck with them so far.
With my old 350 I used the "black magic" single electric fan w/ a clutch fan off the water pump. So the electric was only turned on during the summer heat wheeling the trails.
Now with a BBC I use the dual 13.5" Flex-a-Lite:

http://www.flex-a-lite.com/auto/html...-electric.html

This fan is my only fan and I have had zero heat issues, works great.
As for CFM I would not get any thing below 2500CFM.

Critter · 10-06-2008, 09:53 AM

Quote:

Originally Posted by vtblazer

Camaro fan, two position toggle (high/low), relay's, LED lights and a stock shroud.

Works great 75% of the time on low and is very quite, put it on high and you can watch the needle drop.

Used a old school ignition resistor to provide the 4.5 volts on low.

Fan draws 4.2 amps on low and 10.5 amps on high.

What year Camaro fan, the last years 98-05 or whatever? I'm assuming its from a V8. I kinda like the look of the factory shroud.

johnnywagon · 10-08-2008, 02:51 PM

That Jeep fan set up is definitely the trick way to go. I got really lucky and found one at a swap meet for only 5 bucks! I was able to I.D. it thanks to this forum! I installed it on my 71 camper van (same shroud) and it works great. BUT, if you cant find a Jeep fan, here's a different idea I did to my Blazer and it works even better. http://67-72chevytrucks.com/vboard/s...d.php?t=282793

10-04-2008, 10:29 PM	#1
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	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. __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 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

10-05-2008, 06:14 AM	#2
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	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)

10-05-2008, 07:33 AM	#3
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	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

10-05-2008, 07:57 AM	#4
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: Electric fan ...a shroud is key also.

10-05-2008, 08:30 AM	#5
1972CST Registered User Join Date: Mar 2008 Location: Concord NC Posts: 511	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.

10-05-2008, 08:35 AM	#6
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,764	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 __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 10-05-2008 at 08:36 AM.

10-05-2008, 08:42 AM	#7
1972CST Registered User Join Date: Mar 2008 Location: Concord NC Posts: 511	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.

10-05-2008, 03:06 PM	#10
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	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.

10-05-2008, 08:23 PM	#11
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: Electric fan hopefully here is a picture of what a mouth full 2 11" dual fans and a zz502 are in a 67 Chevelle " Attached Images

10-05-2008, 08:55 PM	#12
1972CST Registered User Join Date: Mar 2008 Location: Concord NC Posts: 511	Re: Electric fan Lets see the rest of the car!

10-06-2008, 05:37 AM	#14
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: Electric fan Camaro fan, two position toggle (high/low), relay's, LED lights and a stock shroud. Works great 75% of the time on low and is very quite, put it on high and you can watch the needle drop. Used a old school ignition resistor to provide the 4.5 volts on low. Fan draws 4.2 amps on low and 10.5 amps on high. Attached Images

10-06-2008, 09:46 AM	#15
Burt4x4 Registered User Join Date: Feb 2000 Location: Modesto, CA Posts: 1,842	Re: Electric fan I have ran Flex-a-lite fans for years and have ahd good luck with them so far. With my old 350 I used the "black magic" single electric fan w/ a clutch fan off the water pump. So the electric was only turned on during the summer heat wheeling the trails. Now with a BBC I use the dual 13.5" Flex-a-Lite: http://www.flex-a-lite.com/auto/html...-electric.html This fan is my only fan and I have had zero heat issues, works great. As for CFM I would not get any thing below 2500CFM. __________________ 1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks

10-08-2008, 02:51 PM	#17
johnnywagon Sofa King. We, Todd, Ed. Join Date: Oct 2006 Location: Spokane, Wa. Posts: 631	Re: Electric fan That Jeep fan set up is definitely the trick way to go. I got really lucky and found one at a swap meet for only 5 bucks! I was able to I.D. it thanks to this forum! I installed it on my 71 camper van (same shroud) and it works great. BUT, if you cant find a Jeep fan, here's a different idea I did to my Blazer and it works even better. http://67-72chevytrucks.com/vboard/s...d.php?t=282793 __________________ ~John 71 Blazer One Ton 65 Chevelle Station Wagon x2 59 Belair 2 Door 71 Chevy Open Road Van RV www.myspace.com/johnnywagon



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