how many cfm's do u recommend
Thread Starter
Intermediate
Joined: Mar 2015
Posts: 27
Likes: 3
how many cfm's do u recommend
I have a 1976 with a 350 small block with 350 hp and 385lb of torque and a four barrel carb
im instaling fans on the front of my radiator and getting rid of the stock fan how many CFM's do u recommend to keep the engine at 180 degrees while stuck in traffic on 90 degree day with the AC on
thank u for any help u can give me
tony
im instaling fans on the front of my radiator and getting rid of the stock fan how many CFM's do u recommend to keep the engine at 180 degrees while stuck in traffic on 90 degree day with the AC on
thank u for any help u can give me
tony
Last edited by tljr; Apr 22, 2015 at 08:45 AM.
2026 Loser of the Year
Joined: Sep 2013
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From: New Or-leens Loo-z-anna
I found a site on the internet several years ago but didn't save it to Favorites. It had a formula for calculating CFM.
I calculated that a stock 350 SBC engine needed 2,200 CFM while idling to stay at 180*F. The formula has worked and has kept my '34 street truck 350 cu.in. SBC "cool" for the last 7 years by using a 2,000 CFM electric PULLER fan connected to a relay/180*F switch.
I calculated that a stock 350 SBC engine needed 2,200 CFM while idling to stay at 180*F. The formula has worked and has kept my '34 street truck 350 cu.in. SBC "cool" for the last 7 years by using a 2,000 CFM electric PULLER fan connected to a relay/180*F switch.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Do you want cheap of fancy? Cheap can be used Ford Taurus of Camaro fans from the 90's. Fancy can be Dewitts. There's dozens(if not hundreds) of posts about electric fan conversions. Do a search and all the info you need will be found.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
As many CFM as you can get. In this case more is better. Your radiator efficiency is going to come into play as well as your A/C condensor efficiency, torque converter slip in an automatic, the color of the car, sunny or cloudy, humidity etc.
Just get as much as you can.
I'm running two 2000 CFM fans and I can maintain 180* at idle up to about 85*-90* with A/C running with a new Dewitts radiator.
Just get as much as you can.
I'm running two 2000 CFM fans and I can maintain 180* at idle up to about 85*-90* with A/C running with a new Dewitts radiator.
Old Fart Pilot
Joined: Apr 2010
Posts: 1,897
Likes: 966
From: Spokane, WA
As many CFM as you can get. In this case more is better. Your radiator efficiency is going to come into play as well as your A/C condensor efficiency, torque converter slip in an automatic, the color of the car, sunny or cloudy, humidity etc.
Just get as much as you can.
I'm running two 2000 CFM fans and I can maintain 180* at idle up to about 85*-90* with A/C running with a new Dewitts radiator.
Just get as much as you can.
I'm running two 2000 CFM fans and I can maintain 180* at idle up to about 85*-90* with A/C running with a new Dewitts radiator.
Thanks
Paul
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
2x 11 inch fans. Puller config. These to be exact.
http://www.ebay.com/itm/Dual-11-Electric-Radiator-Twin-Cooling-Fans-w-Shroud-Extreme-Cooling-2870-CFM-/380287826296?hash=item588aebb978&vxp=mtr
I would say their 2870 cfm rating per fan is optimistic.
http://www.ebay.com/itm/Dual-11-Electric-Radiator-Twin-Cooling-Fans-w-Shroud-Extreme-Cooling-2870-CFM-/380287826296?hash=item588aebb978&vxp=mtr
I would say their 2870 cfm rating per fan is optimistic.
2026 Loser of the Year
Joined: Sep 2013
Posts: 36,573
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From: New Or-leens Loo-z-anna
2x 11 inch fans. Puller config. These to be exact.
Dual 11" Electric Radiator Twin Cooling Fans w Shroud Extreme Cooling 2870 CFM | eBay
I would say their 2870 cfm rating per fan is optimistic.
Dual 11" Electric Radiator Twin Cooling Fans w Shroud Extreme Cooling 2870 CFM | eBay
I would say their 2870 cfm rating per fan is optimistic.
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Pro
Joined: May 2008
Posts: 582
Likes: 9
It's hard to compare fans by CFM as there are many variables that can effect the fan CFM and no industry standard for testing them.
Some fan companies don't advertise CFM due to this, I think spaw is one.
Your best bet is to large fans with a fan shroud.
Some fan companies don't advertise CFM due to this, I think spaw is one.
Your best bet is to large fans with a fan shroud.
Pro
Joined: Apr 2021
Posts: 571
Likes: 101
From: Texas
I have a 1976 with a 350 small block with 350 hp and 385lb of torque and a four barrel carb
im instaling fans on the front of my radiator and getting rid of the stock fan how many CFM's do u recommend to keep the engine at 180 degrees while stuck in traffic on 90 degree day with the AC on
thank u for any help u can give me
tony
im instaling fans on the front of my radiator and getting rid of the stock fan how many CFM's do u recommend to keep the engine at 180 degrees while stuck in traffic on 90 degree day with the AC on
thank u for any help u can give me
tony