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

67ChevyC10Stepside · 05-16-2005, 01:17 PM

ok...i have a 67 short step with a 400 SB in it...wont be doing any towing probably wont be driven on any real long trips or anything but when it is driven will be driven hard. my buddy has a 87 shortbed 305 4wd truck that tows a i think 30 foot horse trailer....and they also have a 85 GMC truck with 350 4wd that tows the same horse trailer...both of those are driven pretty hard....now to the point at hand...the 87 recently sliced a rad house on the fan so when we replaced it we had a electric fan out of some little car laying there so we decided to put it on...with the mechanical fan it got 8 MPG just driving around....with this electric it got 9.9 towing the trailer...so we are gonna buy electrics for all our trucks...not only for that reason...the mech fan gets im my way looks ugly etc etc as well. but the question is...what kind of CFM can a 5 blade clutch fan put out? and what CFM do i need for those trucks mentioned above...im looking at a 2400 and some 2750s...the 2750 is roughly 15 bucks more each than the 2400....sorry for this being so long.

67ChevyC10Stepside · 05-16-2005, 01:42 PM

also should a fan shroud be used with electric fan?

68w/sbc406 · 05-16-2005, 04:06 PM

my friends dad took an electric fan out of a mid 80s firebird/camaro and it fit right inside the fan shroud on his 75. he just drilled 4 small holes every 90* and zip tied the fan in. i wouldnt use those pull through zip ties that come with electric fans. they mess up the fins and look like hell (JMHO) i made my own shroud out of sheet metal and it works (with a 16"), but would be better with it centered (i couldnt center it cause of the water pump) or with 2 12".

LUV2XCLR8 · 05-16-2005, 04:39 PM

HOW MUCH YOU LOKKING TO SPEND

REASON I ASK, WE DISCUSSED THIS IN GREAT
LENGTH AT THE PIGEON FORGE SHOW WHILE
LOOKING AT DIFFERENT EXAMPLES IN TRUCKS

67ChevyC10Stepside · 05-16-2005, 04:41 PM

im not sure on money wise....im just looking for CFM requirements right now...then i'll go from there.

LUV2XCLR8 · 05-16-2005, 04:50 PM

PM "SEE_TEN", HIS SET-UP IS THE BOMB, JMHO, AND THE ONE I
AM GOING WITH IN THE NEAR FUTURE, HIS ARE VARIABLE SPEED,
AND ON HIGH COULD SUCK A SMALL CHILD THROUGH THE GRILL

IT COVERS THE WHOLE INSIDE OF THE RADIATOR, COMES WITH
EVERYTHING, HAS 2 FANS INSTEAD OF ONE, FANS ARE FLEXLITE,
ALSO HAS ADJUSTABLE THERMOSTAT, ETC.... HE SAID IT CAME
FROM SUMMIT, SERIES #295 IS WHAT HE TOLD ME, $369.99

(HE HAS THIS SET-UP ON BOTH OF HIS TRUCKS AND HIS JEEP)

http://www.jegs.com/cgi-bin/ncommerc...50&prmenbr=361

COMES W/ THE UNIT BELOW AS PART OF THE KIT LISTED ABOVE

http://www.jegs.com/cgi-bin/ncommerc...51&prmenbr=361

67ChevyC10Stepside · 05-16-2005, 07:18 PM

i dont want to spend that much....all im looking for in this thread is how much CFM i need.....i can have aluminum mounts tig welded up and everything else i need will wire it myself etc...just need to know what cfm size i need.

67ChevyC10Stepside · 05-16-2005, 09:53 PM

of all the people on this board noone can tell me what kind of CFMs i need?

chickenwing · 05-17-2005, 10:33 AM

Quick look at the flex-a-lite site yielded this: http://www.flex-a-lite.com/heavy2/spec/spec.html

05-16-2005, 01:17 PM	#1
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	fan question ok...i have a 67 short step with a 400 SB in it...wont be doing any towing probably wont be driven on any real long trips or anything but when it is driven will be driven hard. my buddy has a 87 shortbed 305 4wd truck that tows a i think 30 foot horse trailer....and they also have a 85 GMC truck with 350 4wd that tows the same horse trailer...both of those are driven pretty hard....now to the point at hand...the 87 recently sliced a rad house on the fan so when we replaced it we had a electric fan out of some little car laying there so we decided to put it on...with the mechanical fan it got 8 MPG just driving around....with this electric it got 9.9 towing the trailer...so we are gonna buy electrics for all our trucks...not only for that reason...the mech fan gets im my way looks ugly etc etc as well. but the question is...what kind of CFM can a 5 blade clutch fan put out? and what CFM do i need for those trucks mentioned above...im looking at a 2400 and some 2750s...the 2750 is roughly 15 bucks more each than the 2400....sorry for this being so long. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

05-16-2005, 04:06 PM	#3
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	my friends dad took an electric fan out of a mid 80s firebird/camaro and it fit right inside the fan shroud on his 75. he just drilled 4 small holes every 90* and zip tied the fan in. i wouldnt use those pull through zip ties that come with electric fans. they mess up the fins and look like hell (JMHO) i made my own shroud out of sheet metal and it works (with a 16"), but would be better with it centered (i couldnt center it cause of the water pump) or with 2 12". __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

05-16-2005, 04:39 PM	#4
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	HOW MUCH YOU LOKKING TO SPEND REASON I ASK, WE DISCUSSED THIS IN GREAT LENGTH AT THE PIGEON FORGE SHOW WHILE LOOKING AT DIFFERENT EXAMPLES IN TRUCKS __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

05-16-2005, 04:41 PM	#5
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	im not sure on money wise....im just looking for CFM requirements right now...then i'll go from there. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

05-16-2005, 04:50 PM	#6
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	PM "SEE_TEN", HIS SET-UP IS THE BOMB, JMHO, AND THE ONE I AM GOING WITH IN THE NEAR FUTURE, HIS ARE VARIABLE SPEED, AND ON HIGH COULD SUCK A SMALL CHILD THROUGH THE GRILL IT COVERS THE WHOLE INSIDE OF THE RADIATOR, COMES WITH EVERYTHING, HAS 2 FANS INSTEAD OF ONE, FANS ARE FLEXLITE, ALSO HAS ADJUSTABLE THERMOSTAT, ETC.... HE SAID IT CAME FROM SUMMIT, SERIES #295 IS WHAT HE TOLD ME, $369.99 (HE HAS THIS SET-UP ON BOTH OF HIS TRUCKS AND HIS JEEP) http://www.jegs.com/cgi-bin/ncommerc...50&prmenbr=361 COMES W/ THE UNIT BELOW AS PART OF THE KIT LISTED ABOVE http://www.jegs.com/cgi-bin/ncommerc...51&prmenbr=361 __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T Last edited by LUV2XCLR8; 05-16-2005 at 04:55 PM.

05-16-2005, 01:42 PM	#2
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	also should a fan shroud be used with electric fan? __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

05-16-2005, 07:18 PM	#7
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	i dont want to spend that much....all im looking for in this thread is how much CFM i need.....i can have aluminum mounts tig welded up and everything else i need will wire it myself etc...just need to know what cfm size i need. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

05-16-2005, 09:53 PM	#8
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,032	of all the people on this board noone can tell me what kind of CFMs i need? __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

05-17-2005, 10:33 AM	#9
chickenwing Lovin' Life in Miss.! Join Date: Mar 2004 Location: Puckett, Mississippi Posts: 1,937	Quick look at the flex-a-lite site yielded this: http://www.flex-a-lite.com/heavy2/spec/spec.html __________________ The truck... you hear that? No really, you did hear that?!!!



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