Fan Shroud Necassary??

built351w · May 20th, 2008, 07:33 PM

Well I'm assembling my car together now and for those of you who don't know I have a 351w that will push about 400hp and planning on a 150 shot down the road. I bought a summit direct fit aluminum radiator that is like 2 3/4 in deep. I also bought an electric fan that has no plastic shroud around it, it's just an open metal fan that bolts to the radiator and it pulls 2100cfms.

So my question is this, Do I need a radiator shroud, or will I be plenty cool without one???

91cobra5.0 · May 20th, 2008, 07:38 PM

id use one, do you still have the sotck fan shroud?

ThreeHonks302 · May 20th, 2008, 07:41 PM

yea you should use one, it will center the airflow on the radiator

Squints · May 20th, 2008, 08:57 PM

mmm hmm. same concept as a fan boat. without the shroud they would hardly move. or, at least wouldn't move as fast. but with it, all the air is concentrated in one direction.

built351w · May 20th, 2008, 09:11 PM

alright, I'll have to get one.... thanks guys!!!

1slo5.0 · May 20th, 2008, 09:58 PM

Originally Posted by built351w

Well I'm assembling my car together now and for those of you who don't know I have a 351w that will push about 400hp and planning on a 150 shot down the road. I bought a summit direct fit aluminum radiator that is like 2 3/4 in deep. I also bought an electric fan that has no plastic shroud around it, it's just an open metal fan that bolts to the radiator and it pulls 2100cfms.

So my question is this, Do I need a radiator shroud, or will I be plenty cool without one???

What brand of fan is it?

teal89 · May 21st, 2008, 03:34 AM

I don't care what anyone else says but I would run with the shroud because metl fan or plastic, enough rpms on the fan and you can kiss your finger, hand, arm, neck.... body parts goodbye.

It will be plenty cool without one, but plenty unsafe without one too, you never know you might forget just how close the fan is spinning and might chop a finger so be safe and use the shroud.

83fox · May 21st, 2008, 09:40 PM

Originally Posted by teal89

I don't care what anyone else says but I would run with the shroud because metl fan or plastic, enough rpms on the fan and you can kiss your finger, hand, arm, neck.... body parts goodbye.

It will be plenty cool without one, but plenty unsafe without one too, you never know you might forget just how close the fan is spinning and might chop a finger so be safe and use the shroud.

my fan has a plastic cage that fits tight around the fan all the way around to the radiator. unless you let kids poke their fingers in the engine bay with the fan goin, its safe not to use the shroud

klfutrelle · May 21st, 2008, 09:58 PM

I would run a shroud because it helps direct airflow(and will keep the engine cooler vs. without using a shroud) and it will also keep you from getting your fingers, hair, etc. caught in the fan if you're working on the car.

1slo5.0 · May 22nd, 2008, 12:17 PM

Most electric fans have a build in shroud or blade design that is optimum for performance. Adding a shroud to it can hurt airflow and causing cooling issues.

dr.gonzo! · May 22nd, 2008, 12:21 PM

my friends dad was working on a truck without a fan shroud and the fan flew off it didnt hurt him...it killed him

teal89 · May 22nd, 2008, 01:20 PM

Originally Posted by dr.gonzo

my friends dad was working on a truck without a fan shroud and the fan flew off it didnt hurt him...it killed him

^ Like I said my friend... use a shroud. and it's not safe without one eithier. If that one kid had a brain, he'd know kids poking around with the car on and the shroud not on there is unsafe so use a shroud, hey it's your finger man.

HMUSN · May 22nd, 2008, 01:22 PM

Originally Posted by Darrell

Most electric fans have a build in shroud or blade design that is optimum for performance. Adding a shroud to it can hurt airflow and causing cooling issues.

good to know.
thanks

dr.gonzo! · May 22nd, 2008, 01:31 PM

I was working on my car and hit the back of my fingernail on the blade. good god damn that felt good

ryans88gt · May 22nd, 2008, 01:34 PM

Buy an electric fan that has its own shroud. Using the stock shroud with an electric fan will not work very well as darrell pointed out. In order for the stock shroud to work the fan blades have to be at the edge (actually, just outside) of the shroud, otherwise it just impedes the flow.

1slo5.0 · May 22nd, 2008, 04:59 PM

Originally Posted by dr.gonzo

my friends dad was working on a truck without a fan shroud and the fan flew off it didnt hurt him...it killed him

Sorry about your friends dad. Unfortunately a wimping plastic shroud would have not saved his life. Fan shrouds are designed for cooling, not to retain a fan that takes flight.

dr.gonzo! · May 22nd, 2008, 05:01 PM

Originally Posted by Darrell

Sorry about your friends dad. Unfortunately a wimping plastic shroud would have not saved his life. Fan shrouds are designed for cooling, not to retain a fan that takes flight.

true...but it could have deflected it enough to miss him. It could go either way, final destination anyone?

btw it was like a late 70's big block chevy on swampers that he was working on. I dont know if those trucks even came with shrouds.

83fox · May 22nd, 2008, 09:15 PM

thats a very unfortunate thing to happen. but at the rate that fan was spinning at, a plastic shroud would barley deflect the fan. when it comes to spinning metal and stationary thin plastic, spinning metal usually wins

teal89 · May 23rd, 2008, 02:27 AM

Do any of you know if that's a proven fact or is that all based on brain science? Fan Shrouds is not only used JUST for cooling. It's also to aid in the safety for individuals and to help minimize hazards to those near. My parents malibu has electric fans and above it, there's a shroud like thing around that that sticks out further than the fans.

1slo5.0 · May 23rd, 2008, 12:12 PM

Originally Posted by teal89

Do any of you know if that's a proven fact or is that all based on brain science? Fan Shrouds is not only used JUST for cooling. It's also to aid in the safety for individuals and to help minimize hazards to those near. My parents malibu has electric fans and above it, there's a shroud like thing around that that sticks out further than the fans.

Yes, it is a fact if you use a shroud not designed for that particular fan you can do more harm than good. It has been tested over and over again since the day shrouds were invented. Most electric fans have a shroud already and are optimized for airflow. Adding another shroud can actually restrict the airflow. These companies spend alot of R&D on their products.

May 20th, 2008, 07:33 PM	#1
built351w Regular 1979 mustang 5.0 hopefully 11's when complete Join Date: Jul 2007 Location: New Hampshire Posts: 201 iTrader: 0 reviews	Fan Shroud Necassary?? Well I'm assembling my car together now and for those of you who don't know I have a 351w that will push about 400hp and planning on a 150 shot down the road. I bought a summit direct fit aluminum radiator that is like 2 3/4 in deep. I also bought an electric fan that has no plastic shroud around it, it's just an open metal fan that bolts to the radiator and it pulls 2100cfms. So my question is this, Do I need a radiator shroud, or will I be plenty cool without one??? __________________ 1979 hatchback: -351w w/ 10.5:1 -Tremec TKO

May 20th, 2008, 08:57 PM	#4
Squints 2008 Hammock Rodeo Champ 2003 F-150 Lariat FX4 Supercab Join Date: Dec 2007 Location: VB,VA Posts: 1,236 iTrader: 0 reviews	mmm hmm. same concept as a fan boat. without the shroud they would hardly move. or, at least wouldn't move as fast. but with it, all the air is concentrated in one direction. __________________ i have no mustang. so don't listen to anything i say.

May 20th, 2008, 09:11 PM	#5
built351w Regular 1979 mustang 5.0 hopefully 11's when complete Join Date: Jul 2007 Location: New Hampshire Posts: 201 iTrader: 0 reviews	alright, I'll have to get one.... thanks guys!!! __________________ 1979 hatchback: -351w w/ 10.5:1 -Tremec TKO

May 21st, 2008, 03:34 AM	#7
teal89 Enthusiast 89 Mustang Lx Join Date: Feb 2008 Location: Rockwall, Texas Posts: 527 iTrader: 0 reviews	I don't care what anyone else says but I would run with the shroud because metl fan or plastic, enough rpms on the fan and you can kiss your finger, hand, arm, neck.... body parts goodbye. It will be plenty cool without one, but plenty unsafe without one too, you never know you might forget just how close the fan is spinning and might chop a finger so be safe and use the shroud. __________________ 94-95 306, B-Cam, Off-brand BBK Like Headers, H-Pipe, 3.73's, Nitrous Wet Shot 175 Shot

May 22nd, 2008, 12:17 PM	#10
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Most electric fans have a build in shroud or blade design that is optimum for performance. Adding a shroud to it can hurt airflow and causing cooling issues. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

May 20th, 2008, 07:38 PM	#2
91cobra5.0 Hardcore Enthusiast 98 Cobra Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,057 iTrader: 0 reviews	id use one, do you still have the sotck fan shroud?

May 20th, 2008, 07:41 PM	#3
ThreeHonks302 Regular Trans Am WS6 Join Date: Jan 2008 Location: Michigan Posts: 288 iTrader: 0 reviews	yea you should use one, it will center the airflow on the radiator

May 21st, 2008, 09:58 PM	#9
klfutrelle Regular 03gt Join Date: Apr 2008 Posts: 167 iTrader: 4 reviews	I would run a shroud because it helps direct airflow(and will keep the engine cooler vs. without using a shroud) and it will also keep you from getting your fingers, hair, etc. caught in the fan if you're working on the car.

May 22nd, 2008, 01:34 PM	#15
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Buy an electric fan that has its own shroud. Using the stock shroud with an electric fan will not work very well as darrell pointed out. In order for the stock shroud to work the fan blades have to be at the edge (actually, just outside) of the shroud, otherwise it just impedes the flow. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

May 22nd, 2008, 09:15 PM	#18
83fox Enthusiast 1983 mustang lx Join Date: Apr 2008 Posts: 504 iTrader: 0 reviews	thats a very unfortunate thing to happen. but at the rate that fan was spinning at, a plastic shroud would barley deflect the fan. when it comes to spinning metal and stationary thin plastic, spinning metal usually wins

May 23rd, 2008, 02:27 AM	#19
teal89 Enthusiast 89 Mustang Lx Join Date: Feb 2008 Location: Rockwall, Texas Posts: 527 iTrader: 0 reviews	Do any of you know if that's a proven fact or is that all based on brain science? Fan Shrouds is not only used JUST for cooling. It's also to aid in the safety for individuals and to help minimize hazards to those near. My parents malibu has electric fans and above it, there's a shroud like thing around that that sticks out further than the fans. __________________ 94-95 306, B-Cam, Off-brand BBK Like Headers, H-Pipe, 3.73's, Nitrous Wet Shot 175 Shot

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