Cooling Fan CFM Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

trev1 · 10-08-2011, 07:57 PM

For the Guys out there using Electric Cooing Fans. What CFM are you using? I can get two 10" Pusher/Puller fans that are rated at 1250 cfm. Its around $20.00on Ebay each? So would 2500 CFM be enough for a 350 at .40 over flat top pistons, 292 grind Erson cam, and 193 heads??????

I welcome all opions are definately welcomed!!!!

hjewell2 · 10-08-2011, 10:59 PM

Quote:

Originally Posted by trev1

For the Guys out there using Electric Cooing Fans. What CFM are you using? I can get two 10" Pusher/Puller fans that are rated at 1250 cfm. Its around $20.00on Ebay each? So would 2500 CFM be enough for a 350 at .40 over flat top pistons, 292 grind Erson cam, and 193 heads??????

I welcome all opions are definately welcomed!!!!

should work as a puller set-up. Make sure you make or use a shroud it will make a big difference. of course with two ten inch it may not be possible to use a shroud because of the stagger so you may need to mount directly to rad. I have seen one ten inch mounted at the open end where the pump mounted fan would be, looked ok do not know if the person had cooling probs I never asked him.

oldspowered67C10 · 10-08-2011, 11:45 PM

2500 CFM is plenty if indeed they do move that much air. Different fan manufacturers rate CFM differently so beware. Like hjewell2 said, mount them as pullers and a shroud is definitely a good idea. Should work though.

trev1 · 10-09-2011, 08:30 AM

Thanks for the help... Any one got any pics? I will probally fab the shroud up myself. You said mount them as pullers. Does that mean mount them in the front (outside) of the rad, or the back (inside) of the radiator? I would think that I would want to pull fresh air from the outside accross the radiator... Right?

Andy4639 · 10-09-2011, 10:17 AM

Pulling means behind the radiator pulling the air through.

Pushing would be in front pushing the air through. A shroud is a biggie on either one.

Wrenchbender Ret · 10-09-2011, 10:23 AM

Puller is in back of the rad. It has more efetioncy then pusher in front. I have a single 16 in. 2800 cfm puller on mine. It is marginal on a real hot day with A/C on & in traffic. Like Oldspower says, it may not put out that much.
Sorry, my spell correcter got away.

trev1 · 10-09-2011, 08:03 PM

Thanks! Thats the way I will mount them. I am going to buy two 12" fans next week and make the shroud for them. I'll post pics when I get it put together.

crazy longhorn · 10-09-2011, 08:41 PM

I have a pair of 14" fans on my longhorn(Said to pull 1350 ea). They are mounted on a homebrew shroud (built from a tin shelf). The rad is a 4 row copper/brass, & I run painless controls (185 on 165 off). I opted for a 160 stat, & this combo flat works! The old truck runs around 180 on the hyway(no fan action), & will flat azz idle all day long in traffic on the 90-95 degree days in Illinois, & never bust 190 on the temp.They switch off/on in traffic. CrazyL

Ackattack · 10-09-2011, 09:13 PM

I got a jeep fan from summit and mounted it in the stock shroud (as others have to). I'm not sure on the CFM, but it was only $55 (with a price match)

10-08-2011, 07:57 PM	#1
trev1 Registered User Join Date: Nov 2010 Location: Goodman,Mo Posts: 155	Cooling Fan CFM Question For the Guys out there using Electric Cooing Fans. What CFM are you using? I can get two 10" Pusher/Puller fans that are rated at 1250 cfm. Its around $20.00on Ebay each? So would 2500 CFM be enough for a 350 at .40 over flat top pistons, 292 grind Erson cam, and 193 heads?????? I welcome all opions are definately welcomed!!!!

10-08-2011, 11:45 PM	#3
oldspowered67C10 Registered User Join Date: Jan 2006 Location: Cherry Valley,Ca Posts: 468	Re: Cooling Fan CFM Question 2500 CFM is plenty if indeed they do move that much air. Different fan manufacturers rate CFM differently so beware. Like hjewell2 said, mount them as pullers and a shroud is definitely a good idea. Should work though.

10-09-2011, 08:30 AM	#4
trev1 Registered User Join Date: Nov 2010 Location: Goodman,Mo Posts: 155	Re: Cooling Fan CFM Question Thanks for the help... Any one got any pics? I will probally fab the shroud up myself. You said mount them as pullers. Does that mean mount them in the front (outside) of the rad, or the back (inside) of the radiator? I would think that I would want to pull fresh air from the outside accross the radiator... Right?

10-09-2011, 10:17 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Cooling Fan CFM Question Pulling means behind the radiator pulling the air through. Pushing would be in front pushing the air through. A shroud is a biggie on either one. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-09-2011, 10:23 AM	#6
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,226	Re: Cooling Fan CFM Question Puller is in back of the rad. It has more efetioncy then pusher in front. I have a single 16 in. 2800 cfm puller on mine. It is marginal on a real hot day with A/C on & in traffic. Like Oldspower says, it may not put out that much. Sorry, my spell correcter got away.

10-09-2011, 08:03 PM	#7
trev1 Registered User Join Date: Nov 2010 Location: Goodman,Mo Posts: 155	Re: Cooling Fan CFM Question Thanks! Thats the way I will mount them. I am going to buy two 12" fans next week and make the shroud for them. I'll post pics when I get it put together.

10-09-2011, 08:41 PM	#8
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Re: Cooling Fan CFM Question I have a pair of 14" fans on my longhorn(Said to pull 1350 ea). They are mounted on a homebrew shroud (built from a tin shelf). The rad is a 4 row copper/brass, & I run painless controls (185 on 165 off). I opted for a 160 stat, & this combo flat works! The old truck runs around 180 on the hyway(no fan action), & will flat azz idle all day long in traffic on the 90-95 degree days in Illinois, & never bust 190 on the temp.They switch off/on in traffic. CrazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

10-09-2011, 09:13 PM	#9
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Cooling Fan CFM Question I got a jeep fan from summit and mounted it in the stock shroud (as others have to). I'm not sure on the CFM, but it was only $55 (with a price match) __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index



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