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Old September 26th, 2016, 11:18 AM   #21
GearDrive
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I assume you guys mean a complete core coverage shroud. The spal fan has a “shroud” that fits tight against the core. The effective ness of the fan is debatable, and I understand your concern. The fan is rated at 2024cfm, and 16” diameter. Am I getting full velocity from the fan? Probably not, due to the restriction of the core. Now 100% of the air flow from the fan is within the 16” circle. Is this enough to cool a mild SBC at slow speeds? For my intent of use for this vehicle, so far, yes.

Now say I Build a full coverage shroud, and move the fan back 1”. I can now obtain full velocity of the rated flow. I’m going to guess that 80 % of the flow will be within the 16” circle. The other 20% distributed to the rest of the core, gradually decreasing from the 16” circle. By the time you get to the corners of the core, the air flow is minimal. That is, of course, if I get no air gaps fabricating a full shroud.

Gains at slow speeds from no “shroud” to full shroud: My opinion, 0

At higher speeds, having the core open in the corners, allows natural air flow to enter the core without restriction. With a full shroud, there is a restriction to not allow natural air flow.

Gains at higher speeds from “no shroud” to full shroud: My opinion, negative gains.

And now boys and girls, some real life experiences.

1) The same setup on my crawler, but with a 500 ci engine. Sees a lot of slower speeds. No problems
2) ’83 Chevy crew cab, tow rig, 500 ci engine, stock rad, dual electric fans, minimal shroud. No problems
3) ’88 MJ 4.7 stroker, Stock cooling system. Half of radiator core open. No problems
4) ’76 Corvette, Big block, aluminum heads, 3 row DeWitt’s aluminum rad. Dual electric fans, FULL shroud. Experiencing problems.
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Old September 26th, 2016, 12:05 PM   #22
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Another “shroud” experience.

I have an outdoor wood furnace, and use it to heat my shop also. I built the heat exchanger out of an automotive radiator, old washing machine, and squirrel cage blower from a furnace.
The blower is about 10” away from the rad. Even with a shroud that completely contains the core, I only feel the majority of the air flow directly from the blower, not spread out across the whole core.
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Old September 30th, 2016, 12:36 PM   #23
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Quote:
Originally Posted by GearDrive View Post
I assume you guys mean a complete core coverage shroud. The spal fan has a “shroud” that fits tight against the core. The effective ness of the fan is debatable, and I understand your concern. The fan is rated at 2024cfm, and 16” diameter. Am I getting full velocity from the fan? Probably not, due to the restriction of the core. Now 100% of the air flow from the fan is within the 16” circle. Is this enough to cool a mild SBC at slow speeds? For my intent of use for this vehicle, so far, yes.

Now say I Build a full coverage shroud, and move the fan back 1”. I can now obtain full velocity of the rated flow. I’m going to guess that 80 % of the flow will be within the 16” circle. The other 20% distributed to the rest of the core, gradually decreasing from the 16” circle. By the time you get to the corners of the core, the air flow is minimal. That is, of course, if I get no air gaps fabricating a full shroud.

Gains at slow speeds from no “shroud” to full shroud: My opinion, 0

At higher speeds, having the core open in the corners, allows natural air flow to enter the core without restriction. With a full shroud, there is a restriction to not allow natural air flow.

Gains at higher speeds from “no shroud” to full shroud: My opinion, negative gains.

And now boys and girls, some real life experiences.

1) The same setup on my crawler, but with a 500 ci engine. Sees a lot of slower speeds. No problems
2) ’83 Chevy crew cab, tow rig, 500 ci engine, stock rad, dual electric fans, minimal shroud. No problems
3) ’88 MJ 4.7 stroker, Stock cooling system. Half of radiator core open. No problems
4) ’76 Corvette, Big block, aluminum heads, 3 row DeWitt’s aluminum rad. Dual electric fans, FULL shroud. Experiencing problems.
My real life experience was that shroud made big difference; but to each their own.
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Old September 30th, 2016, 12:56 PM   #24
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Did you go from absolutely no shroud to a full shroud?
Or from a minimal, circular shroud like mine, to a full shroud?
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Old October 3rd, 2016, 06:22 AM   #25
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I did a test on the fan.

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Old April 4th, 2017, 10:14 AM   #26
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Old February 25th, 2019, 05:58 AM   #27
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Almost done
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Old February 25th, 2019, 07:20 AM   #28
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Looking good!
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Old February 25th, 2019, 07:47 AM   #29
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Looking good!
Hell yeah!
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Old March 29th, 2019, 01:10 PM   #30
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My door panels were shity. So I filled the openings with tread plate.
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Old March 29th, 2019, 01:53 PM   #31
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My real life experience was that shroud made big difference; but to each their own.
I would imagine a lot of it had to do with the distance from the radiator. the mounting flange of the electric fan creates a shroud.

Electric fan, not necessarily a big deal as long as you can get the cfm large enough to counter the temp difference coming from the engine.

Mechanical fan, big difference.

Yes, I know the post is from 2016.
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Old April 2nd, 2019, 09:41 AM   #32
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This is awesome, dirt simple and easy, I love it.
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Old August 27th, 2019, 07:38 AM   #33
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Just need to mount my 8274.
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Old August 27th, 2019, 07:57 AM   #34
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Looks great!
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Old August 27th, 2019, 07:21 PM   #35
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Nice clean ride.
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