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post #1 of 11 (permalink) Old Apr 28th, 07, 09:07 AM Thread Starter
 
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Fan shroud

I recently installed an aluminum radiator and an aftermarket electric fan. I took of the original fan shroud and belt driven fan. Should I mod the old shroud and reinstall it? Will I gain more direct air flow or is this not worth the hassle?Maybe I should sell it!The electric fan does have its own cheezy shroud!Its a flexilite 15 in.
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post #2 of 11 (permalink) Old Apr 28th, 07, 01:04 PM
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Re: Fan shroud

Shouldn't need one with and electric fan.

68 Camaro~LSx ~all motor
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post #3 of 11 (permalink) Old May 2nd, 07, 02:04 PM
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Re: Fan shroud

The original fan, clutch, and shroud will move a LOT more air than a 15" Flex-A-Lite, and will pull it through the total surface of the core, all the way out to the corners; the electric fan will only pull air through the core within its diameter. Gotta wonder why people do this.

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post #4 of 11 (permalink) Old May 2nd, 07, 03:00 PM
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Cool Re: Fan shroud

I have a new aluminum radiator, and bought two-10" electric fans.
I went back to my original shroud and 7-blade pulled fan.
Huge difference in airflow and cooling..

Anyone want to buy two-10" electric fans??
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post #5 of 11 (permalink) Old May 2nd, 07, 07:42 PM
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Re: Fan shroud

Ghostbuster, post them up on Craigslist, you'll probably unload them fast to some 17 year old kid

1969 Camaro - GM 2003 Electron Blue
Beck Racing 383 cu in 465HP Engine - Sean Murphy Inductions Stage 2 Quadrajet
TCI Streetfighter 350 - 3.73:1 Posi 10 Bolt Rear - 12.6 sec qtr mile

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post #6 of 11 (permalink) Old May 7th, 07, 09:02 AM Thread Starter
 
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Re: Fan shroud

Why all the hype about the elctric fans then!!!
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post #7 of 11 (permalink) Old May 7th, 07, 06:12 PM
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Re: Fan shroud

Quote:
Originally Posted by fearsomfoe View Post
Why all the hype about the elctric fans then!!!
Because that's just what it is - HYPE. Unless you're running outrageous horsepower and physically don't have room for a fan, it's wasted effort trying to out-engineer the factory setup from a catalog. Leave the factory fan, clutch, and shroud alone, and just add more radiator cooling capacity if you add more power.


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post #8 of 11 (permalink) Old May 11th, 07, 12:14 PM
 
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Re: Fan shroud

I agree....stay away from electric fans. Been there done that.

They don't work that great plus they draw a lot of amps and the relays crap out. Keep it simple is my advice. Keep the mechanical fan if possible.

That's my experience from hot Atlanta, GA slow moving traffic.

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post #9 of 11 (permalink) Old May 11th, 07, 12:19 PM
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Re: Fan shroud

Electric;
Do this instead;

One owner 69 Camaro,(yep, bought it new
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post #10 of 11 (permalink) Old May 11th, 07, 01:45 PM
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Cool Re: Fan shroud

Quote:
Originally Posted by fearsomfoe View Post
Why all the hype about the elctric fans then!!!
You can not expect to get full coverage with electric fans. They use two 12" fans which are not as efficient as one 18" mechanical fan. Without a shroud covering the tip of the fan blade (mechanical or electric) you reduce the effective area of the blade by a third; as the air on that portion of the blade just slides off the end of the blade without a shroud to stop it.

Compute the area of two 12" circles (226.19 square inches) and compare that with one circle of 18" diameter (A=π r^2) circle of 254.47 square inches. Now consider that the majority of the air is moved by the portion of the blade furthest from the central hub (radial velocity increases with the square of the radius) which tells you that a blade 33% longer will move more air because of its increased area and the tip speed of the blade.

The biggest factor involved in moving the air through the radiator, and the reason the electric blades are so small is because it has a wimpy 1/6th of a horse power motor. Compare that with the power of a SBC. Which do you think could turn a bigger blade better?

The "reason" every one goes to the electric fans is because they are new! Trendy, Fashionable, (Iím just waiting for the introduction of a designer label electric fan with a spiffy exclusive icon). Oh yeah, that and all modern cars (not muscle cars from the sixties) have a lower hood line for better aerodynamics (dictated not by stylist but by the EPA for mileage reasons). If you stuck an 18" diameter fan centered on the water pump in a new (well this assumed they still had front wheel drive) it would slice through the hood. And as mentioned new cars are mostly sidewinders with the motor put in wrong, and driving the wrong end of the car. So a fan stuck on the end of the motor would miss the radiator by a few yards (or should I say meters?).

There is no reason any one can give me to put an electric fan on an early model Camaro, or third generation (1968-í74 Nova); same for a 1957 to 1996 Chevrolet (B-bodies). Some SUVís are saddled with electric fans, only because GM likes to have one part fit all, and since they donít make mechanical fans any more your Caddy (former Suburban when it cost half as much) is stuck with it also.


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post #11 of 11 (permalink) Old May 11th, 07, 02:27 PM
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Re: Fan shroud

My 69 Camaro is Mechanical Clutch Fan
My 63 Nova is Mechanical Clutch Fan

MY 2003 INFINITI G35 Sports Sedan is MECHANICAL CLUTCH FAN!

It just plain works, back in the 60s and today as well!

1969 Camaro - GM 2003 Electron Blue
Beck Racing 383 cu in 465HP Engine - Sean Murphy Inductions Stage 2 Quadrajet
TCI Streetfighter 350 - 3.73:1 Posi 10 Bolt Rear - 12.6 sec qtr mile

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