1 electric fan enough? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

El Campo · 07-31-2011, 11:44 PM

Is one 16 inch electric fan enough if it's attached to the stock 4 core big block radiator? I was looking at the Zirgo 3000 cfm fan for around 200 bucks and was wondering if that would work. Haven't had a problem with overheating using the stock engine driven fan. No AC at this time, maybe in the future, a little over 600 HP, lots of 100 degree days
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fastwillie 696969 · 08-01-2011, 02:52 AM

thats the one im running on my truck and i got a blower which suppose to run hotter,but i havnt seen it get over 190 , just install a relay switch with it ,i got mine so that it stays on with key on ,some guys like to run it all times and toggle switch it ,i used to do that but there were times i forgot to turn it off and battery went dead .

Wrenchbender Ret · 08-01-2011, 10:28 AM

Ive got a single 16 in. rated at 2800 CFM & the 4 core radiator. It runs a little hotter then I like in traffic with the A/C on. It has never caused a problem but I would go for a dual fan setup if I did it again.

Andy4639 · 08-01-2011, 11:04 AM

I have a 18" fan I just installed last week out of a Mini van for $40.00 bucks. It's hooked to the AC fan switch to the relay which runs only when the fan is on. It's keeping plenty of air moving on the condensor to keep the truck cool on these 100 degree day at 40 degree's inside even while sitting stil.

solar649 · 08-01-2011, 11:40 AM

Ive got a 19 inch fan out of a Mercury grand marque. I believe it was 2000 or so. The car ran an electric and a mecahnical fan. This was for the air unit.

I got this fan for 25.00. mounted it up and it works great. I am not running a mechanical fan with the small block. I have an alum radiator and a 160 degree thermostat. It never goes over 170 degrees , even in traffic.

tubbedII · 08-01-2011, 11:51 AM

I always hear to use a shroud for best cooling, so I picked up the grand cherokee electric fan after reading this post: http://67-72chevytrucks.com/vboard/s...d.php?t=254617.

I don't have it in since my blazer currently isn't running, but it fits the stock shroud perfectly.

71meangreenc10 · 08-01-2011, 12:30 PM

Quote:

Originally Posted by tubbedII

I always hear to use a shroud for best cooling, so I picked up the grand cherokee electric fan after reading this post: http://67-72chevytrucks.com/vboard/s...d.php?t=254617.

I don't have it in since my blazer currently isn't running, but it fits the stock shroud perfectly.

Running that fan and its working out real well so far.

Smitty

tubbedII · 08-01-2011, 02:04 PM

Cool! How loud is it?

Lippyp · 08-01-2011, 02:35 PM

I'm putting a single 18" or so fan out of a Volvo 850 T5 in mine on a homemade aluminium shroud. This is replacing a single 12" fan with shroud from some car or other that the previous owner chucked on there, it only covers half the radiator and seems to cool OK so I guess the bigger more efficient one (its a curved multibladed job against the current one which has I think four straight blades) will do fine. Its being controlled by an adjustable derale controller with the temp switch going in the intake manifold next to the thermostat and the current manual switch in the cab will be used as a manual override.

franks72 · 08-01-2011, 07:37 PM

This is what the mopar fan looks like in a bigblock shroud.

dwcsr · 08-01-2011, 07:45 PM

You can use a Mercury Cougar 4.6 or a T Bird fan. New at Rockauto its about $78. Far better than any Zirgo in price and dependability.

Here is a writ eup on it in a 72 C10
http://www.thehollisterroadcompany.com/MarkVIII.html

Andy4639 · 08-01-2011, 09:15 PM

Quote:

Originally Posted by franks72

This is what the mopar fan looks like in a bigblock shroud.

That is close to what mine looks like. Mine had a low speed and high speed wire on it. The motor was thicker though. I hooked up the low speed. The high speed was just to much I thought!
I hooked mine up in front of the radiator though because I didn't have enough room between the motor fan and radiator.

Lippyp · 08-02-2011, 03:10 AM

This is my volvo fan, I have a sheet of aluminium ready to build the shroud when I get back from my vacation.

El Campo · 08-13-2011, 08:44 PM

Been a while since I posted on here but I had another question. Do any of you people who are running the Mopar fan have a part number handy? And any idea how many CFM it puts out? Surely a stock mechanical fan cannot move more than 1000 CFM if even that at an idle (which is what I am most worried about heating up at as at more than an idle there will be air flow through the radiator from driving) don't you all think? Also, (this may be a dumb question) is it possible to run TOO cool?? Not worried about winters as it is rarely colder than 30 here. Am thinking about putting in addition to electric fan a 3 or 4 core all aluminum radiator as well as a high flow water pump. If I run the fan all the time while truck is running with this setup will that be a problem?
P.S if the fan does not fit shroud I will build one for it

El Campo · 09-02-2011, 04:56 PM

So reading around the net and supposedly a stock mechanical fan only moves about 800 CFM. My question now is does anyone have an electric fan like the Cherokee fan on a big block with long water pump? Does it fit? I hear they are a really tight fit. From what I can tell there is only 10.5 inches of clearance from the front of block to back of radiator and the long water pump is around 7.5 inches long. Doesn't give much room!!!!!
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cpetersen · 09-02-2011, 06:33 PM

Quote:

Originally Posted by franks72

This is what the mopar fan looks like in a bigblock shroud.

What did you do with the funny looking wire pigtail. Did you just cut it apart? And use a Jegs Setup?

cpetersen · 09-02-2011, 07:45 PM

Just called mopar. The wire set for that fan is $34.00. Part number is 5013979AB. Fan Part number is cbg4f250 and it is $84.31

danleaman · 09-02-2011, 08:20 PM

Quote:

Originally Posted by El Campo

Been a while since I posted on here but I had another question. Do any of you people who are running the Mopar fan have a part number handy? And any idea how many CFM it puts out? Surely a stock mechanical fan cannot move more than 1000 CFM if even that at an idle (which is what I am most worried about heating up at as at more than an idle there will be air flow through the radiator from driving) don't you all think? Also, (this may be a dumb question) is it possible to run TOO cool?? Not worried about winters as it is rarely colder than 30 here. Am thinking about putting in addition to electric fan a 3 or 4 core all aluminum radiator as well as a high flow water pump. If I run the fan all the time while truck is running with this setup will that be a problem?
P.S if the fan does not fit shroud I will build one for it

If your cooling system is in good shape and you have the proper thermostat too cool will not be a problem.

71swb4x4 · 09-02-2011, 08:22 PM

Andy4639, that fan is a puller right? How did you get it to push the air through the radiator?

Ackattack · 09-02-2011, 11:46 PM

moparonlineparts.com has it for $56

http://www.moparonlineparts.com/part...&siteid=214954

I'm going to put in an order with summit and hope they price match this

El Campo · 09-03-2011, 09:43 AM

Some on here have said that an aluminum headed engine needs to have a hotter thermostat then a iron headed one. Is that true and if so why? I have heard 195 degree thermostat!!
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MagmaJct · 09-03-2011, 11:05 AM

I've never heard that engine temp is set differently for aluminum heads vs. iron. However, I do know that to improve thermal efficiency and improve combustion hotter is better. (Of course, not to the point that engine damage occurs!)

07-31-2011, 11:44 PM	#1
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	1 electric fan enough? Is one 16 inch electric fan enough if it's attached to the stock 4 core big block radiator? I was looking at the Zirgo 3000 cfm fan for around 200 bucks and was wondering if that would work. Haven't had a problem with overheating using the stock engine driven fan. No AC at this time, maybe in the future, a little over 600 HP, lots of 100 degree days Posted via Mobile Device __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!

08-01-2011, 02:52 AM	#2
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: 1 electric fan enough? thats the one im running on my truck and i got a blower which suppose to run hotter,but i havnt seen it get over 190 , just install a relay switch with it ,i got mine so that it stays on with key on ,some guys like to run it all times and toggle switch it ,i used to do that but there were times i forgot to turn it off and battery went dead . Attached Images __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

08-01-2011, 10:28 AM	#3
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,207	Re: 1 electric fan enough? Ive got a single 16 in. rated at 2800 CFM & the 4 core radiator. It runs a little hotter then I like in traffic with the A/C on. It has never caused a problem but I would go for a dual fan setup if I did it again.

08-01-2011, 11:04 AM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: 1 electric fan enough? I have a 18" fan I just installed last week out of a Mini van for $40.00 bucks. It's hooked to the AC fan switch to the relay which runs only when the fan is on. It's keeping plenty of air moving on the condensor to keep the truck cool on these 100 degree day at 40 degree's inside even while sitting stil. __________________ 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.

08-01-2011, 11:40 AM	#5
solar649 Registered User Join Date: Mar 2011 Location: cleveland, ohio Posts: 20	Re: 1 electric fan enough? Ive got a 19 inch fan out of a Mercury grand marque. I believe it was 2000 or so. The car ran an electric and a mecahnical fan. This was for the air unit. I got this fan for 25.00. mounted it up and it works great. I am not running a mechanical fan with the small block. I have an alum radiator and a 160 degree thermostat. It never goes over 170 degrees , even in traffic.

08-01-2011, 11:51 AM	#6
tubbedII needs more $$$ Join Date: Mar 2004 Location: Sacramento Posts: 1,936	Re: 1 electric fan enough? I always hear to use a shroud for best cooling, so I picked up the grand cherokee electric fan after reading this post: http://67-72chevytrucks.com/vboard/s...d.php?t=254617. I don't have it in since my blazer currently isn't running, but it fits the stock shroud perfectly. __________________ 1970 2wd Blazer

08-01-2011, 02:04 PM	#8
tubbedII needs more $$$ Join Date: Mar 2004 Location: Sacramento Posts: 1,936	Re: 1 electric fan enough? Cool! How loud is it? __________________ 1970 2wd Blazer

08-01-2011, 02:35 PM	#9
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: 1 electric fan enough? I'm putting a single 18" or so fan out of a Volvo 850 T5 in mine on a homemade aluminium shroud. This is replacing a single 12" fan with shroud from some car or other that the previous owner chucked on there, it only covers half the radiator and seems to cool OK so I guess the bigger more efficient one (its a curved multibladed job against the current one which has I think four straight blades) will do fine. Its being controlled by an adjustable derale controller with the temp switch going in the intake manifold next to the thermostat and the current manual switch in the cab will be used as a manual override. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

08-01-2011, 07:37 PM	#10
franks72 Junior Member Join Date: Mar 2005 Location: Wilmington DE Posts: 218	Re: 1 electric fan enough? This is what the mopar fan looks like in a bigblock shroud. __________________ 72 cheyenne super BB402 TH400 Air Tack Tilt Posi P/S P/B AM/FM 12.96 @ 101.82 mph 60ft 1.82 12.39 @111.33 With a 180 shot nos 69 Camaro RS http://s94.photobucket.com/albums/l117/fdelcoglin/ email fdelcoglin@hotmail.com

08-01-2011, 07:45 PM	#11
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: 1 electric fan enough? You can use a Mercury Cougar 4.6 or a T Bird fan. New at Rockauto its about $78. Far better than any Zirgo in price and dependability. Here is a writ eup on it in a 72 C10 http://www.thehollisterroadcompany.com/MarkVIII.html

08-02-2011, 03:10 AM	#13
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: 1 electric fan enough? This is my volvo fan, I have a sheet of aluminium ready to build the shroud when I get back from my vacation. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

08-13-2011, 08:44 PM	#14
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	Re: 1 electric fan enough? Been a while since I posted on here but I had another question. Do any of you people who are running the Mopar fan have a part number handy? And any idea how many CFM it puts out? Surely a stock mechanical fan cannot move more than 1000 CFM if even that at an idle (which is what I am most worried about heating up at as at more than an idle there will be air flow through the radiator from driving) don't you all think? Also, (this may be a dumb question) is it possible to run TOO cool?? Not worried about winters as it is rarely colder than 30 here. Am thinking about putting in addition to electric fan a 3 or 4 core all aluminum radiator as well as a high flow water pump. If I run the fan all the time while truck is running with this setup will that be a problem? P.S if the fan does not fit shroud I will build one for it __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!

09-02-2011, 04:56 PM	#15
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	Re: 1 electric fan enough? So reading around the net and supposedly a stock mechanical fan only moves about 800 CFM. My question now is does anyone have an electric fan like the Cherokee fan on a big block with long water pump? Does it fit? I hear they are a really tight fit. From what I can tell there is only 10.5 inches of clearance from the front of block to back of radiator and the long water pump is around 7.5 inches long. Doesn't give much room!!!!! Posted via Mobile Device __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!

09-02-2011, 07:45 PM	#17
cpetersen Registered User Join Date: Feb 2010 Location: mesa az Posts: 211	Re: 1 electric fan enough? Just called mopar. The wire set for that fan is $34.00. Part number is 5013979AB. Fan Part number is cbg4f250 and it is $84.31

09-02-2011, 08:22 PM	#19
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: 1 electric fan enough? Andy4639, that fan is a puller right? How did you get it to push the air through the radiator? __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.



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09-02-2011, 11:46 PM	#20
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: 1 electric fan enough? moparonlineparts.com has it for $56 http://www.moparonlineparts.com/part...&siteid=214954 I'm going to put in an order with summit and hope they price match this __________________ 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

09-03-2011, 09:43 AM	#21
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	Re: 1 electric fan enough? Some on here have said that an aluminum headed engine needs to have a hotter thermostat then a iron headed one. Is that true and if so why? I have heard 195 degree thermostat!! Posted via Mobile Device __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!

09-03-2011, 11:05 AM	#22
MagmaJct Registered User Join Date: May 2008 Location: Mesa, AZ Posts: 281	Re: 1 electric fan enough? I've never heard that engine temp is set differently for aluminum heads vs. iron. However, I do know that to improve thermal efficiency and improve combustion hotter is better. (Of course, not to the point that engine damage occurs!) __________________ I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba.

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