Fan Shroud??? Yes or No? - Team Camaro Tech
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post #1 of 29 (permalink) Old Jul 3rd, 07, 10:49 AM Thread Starter
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Charlie
 
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Fan Shroud??? Yes or No?

I have a 350sbc and when I replaced the mechanical fan with an electric one, I was told that I did not need a shroud. I am not experiencing any overheating issues. In fact, the car runs between 180 and 190 all day long. I am just wondering if I would benefit with a shroud? As always, I appreciate your help. Thanks.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #2 of 29 (permalink) Old Jul 3rd, 07, 11:17 AM
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Re: Fan Shroud??? Yes or No?

i have a 350 also with an eletric fan. no shroud. on a hot day (90*) sitting in a drive thru for 20 minutes in never goes over 185*
i was worried that it would, but so far so good.

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post #3 of 29 (permalink) Old Jul 3rd, 07, 11:18 AM Thread Starter
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Charlie
 
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Re: Fan Shroud??? Yes or No?

Cool. The guys at Summit said that you don't really need a shroud with an electric as the housing assembly acts as a shroud. I just thought I may benefit from adding one, but I don't think I am going to the trouble. Thanks.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #4 of 29 (permalink) Old Jul 3rd, 07, 01:19 PM
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Re: Fan Shroud??? Yes or No?

if it's cool, it's cool!





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post #5 of 29 (permalink) Old Jul 5th, 07, 12:28 PM
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Re: Fan Shroud??? Yes or No?

Quote:
Originally Posted by 67CamaroRS/SS View Post
Cool. The guys at Summit said that you don't really need a shroud with an electric as the housing assembly acts as a shroud. I just thought I may benefit from adding one, but I don't think I am going to the trouble. Thanks.

Being a former Summit employee i am VERY confident that this information may be more of a personal opinion or view. Using a shroud on a radiator will greatly increase your cooling capabilities of your engine especially at idle or low speeds where air flow is at a minimum.

We all eventually get stuck in a traffic jam no matter how hard we try to avoid them. With a shroud & high powered fan you will be sitting cool in the hot sun. If you ever plan to use your car in a parade or attend one any of the monster car shows where you cruise around the grounds at a low speed you will happy that you decided on a shrouded fan!

When you enclose the entire backside of the radiator core with a shroud you create a virtual vacuum chamber to pull air through the entire core instead of only pulling air through the particular diameter of the fan(s) that you would otherwise mount directly to the core.

When selecting a fan(s) to be used with a shroud it is crucial to have sufficient fan opening area to allow high speed airflow through the radiator and then exit the shroud through the fan(s) opening(s).
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post #6 of 29 (permalink) Old Jul 5th, 07, 12:39 PM Thread Starter
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Re: Fan Shroud??? Yes or No?

That only applies to a mechanical fan as an electric fan mounts directly to the radiator. When was the last time you saw an electric fan with a shroud on an OEM application. I had a civic and a turbo eclipse and neither of them had a shroud on the electric fan. I agree 100% with your statement when pertaining to a mechanical fan, but not an electric, which I have. My car has no problem staying cool when running at very low speed or at 5000-6000rpm. The car at 6000 runs at 195 degrees, but as soon as it comes back down to 2000rpm it drops right back to a cool 180.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #7 of 29 (permalink) Old Jul 5th, 07, 12:39 PM Thread Starter
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Charlie
 
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Re: Fan Shroud??? Yes or No?

That's my opinion and I'm sticking to it.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #8 of 29 (permalink) Old Jul 5th, 07, 12:45 PM
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Re: Fan Shroud??? Yes or No?

Quote:
Originally Posted by 67CamaroRS/SS View Post
When was the last time you saw an electric fan with a shroud on an OEM application.
Ummm the Mark VIII and Taurus fans that are frequently modded to our cars have shrouds...

Steve
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post #9 of 29 (permalink) Old Jul 5th, 07, 12:48 PM Thread Starter
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Charlie
 
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Re: Fan Shroud??? Yes or No?

That's modded. The housing of the fan acts as the shroud. None of the vehicles I have with OEM electric fans have used a CONVENTIONAL shroud. Now when someone mods them to a car they may make a shroud for it, but when it was installed on the car OEM it did not have a CONVENTIONAL shroud.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #10 of 29 (permalink) Old Jul 5th, 07, 12:53 PM Thread Starter
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Charlie
 
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Re: Fan Shroud??? Yes or No?

That is part of the fan housing. It's how it gets bolted to the car.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #11 of 29 (permalink) Old Jul 5th, 07, 02:31 PM
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Re: Fan Shroud??? Yes or No?

We've had several cars over the last 20+ years with electric fans. (All OEM) Call their housing anything you want but they sure look like a shroud.
Maybe the term 'shroud' is in need of a definition. How about 'A housing encompassing the radiator and fan placed in such a way so as to ensure that fan-forced air moves through the entire radiator surface area'?
OK, OK, don't yell at me! I just made it up!!

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post #12 of 29 (permalink) Old Jul 5th, 07, 03:57 PM
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Re: Fan Shroud??? Yes or No?

For short, you could just call it AHETRAFPISAWSATETFFAMTERSA.


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post #13 of 29 (permalink) Old Jul 5th, 07, 06:55 PM
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Re: Fan Shroud??? Yes or No?

I think that it has to do with how far away the fan is mounted to the radiator...Most electric fans are mounted so close to the radiator that a conventional shroud is not required...not to mention the housing of an electric fan acts as a mini shroud to begin with.....

Dan
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post #14 of 29 (permalink) Old Jul 5th, 07, 07:56 PM
 
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Re: Fan Shroud??? Yes or No?

usually, aftermarket elec`s are mounted too close to the rad to utilize a shroud...the fan has to be placed in the mouth of the shroud in order to pull air from the complete surface area of the rad...(the throat would be closest to the rad)elecs are mounted close to the rad for efficiency... and alot of oems will use a small dia fan with a ton of pitch, and a shroud that encompasses the surface area of the rad to get the same effect as a mech fan accompanied by a shroud on a first gen...cooling system design plays a big part on fan req`s...the taurus fan moves something like 4500 cfm...thats more than most aftermarket fans do...they also have a shroud on them...the mark8 fans move something like 5600 cfm...thats huge!!!either is a great junkyard choice for cooling...(and again, both have shrouds) but as i said earlier, most aftermarket fans are too close to utilize a shroud, and therefore arent needed...where`s doc cool on this one???
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post #15 of 29 (permalink) Old Jul 6th, 07, 05:29 AM Thread Starter
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Re: Fan Shroud??? Yes or No?

I got lucky to find an aftermarket electric that moves 3985cfm and it is a single design. 16"

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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