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Author Topic:   Cooling W/out Shroud
25JHenry
Dirt Full Roller

Total posts: 73
posted March 18, 2004 08:33 AM  
I do not want to run a shroud unless absolutely necessary. I want to be able to get right to the belts if a problem occurs. Last year the 4 blade metal fan was about 6-8" from the radiator. We heated a little so we shrouded it up and the problem was solved. My question is this, If I move the radiator and make it 2" from the fan do you think we can cool sufficiently w/out a shroud???? We run a 5/8 washer in the gooseneck and a 4 core aluminum radiator.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted March 18, 2004 09:00 AM  
i run a gas mod with no shroud, we put the fan close to rad, a 2 core aluminum radiator with the 1 inch wide cores, and 1:1 pulleys. no heat problems even in the middle of the summer.

racerman707
Dirt Freak

Total posts: 374
posted March 18, 2004 10:23 AM  
We ran our fan 1 inch from the radiator last year with no shroud and never heated.

4racer19
Dirt Roller

Total posts: 18
posted March 18, 2004 07:15 PM  
My ever so humble opinion, is run the shroud, and keep your fan back some, for a couple of reasons.

1) I know some of the guys are successful in running without a shroud, but I have had much better results withone.

2) By keeping your fan back some, you are less likely to have the radiator knocked back into the fan, in the case of "racing incident"

[This message has been edited by 4racer19 (edited March 18, 2004).]

zeroracing
Dirt Forum Champ
Total posts: 1875
posted March 18, 2004 07:22 PM  
good i dea to keep the rad a decent distance form the fan in a street stock if you can, my mod if i break the radiator i am pretty welll ****** anyway. its behind the crosmember.
i know this kinda contridicts what i alread said, but that works for us in our mod. if i had a street i would space it some.

[This message has been edited by zeroracing (edited March 18, 2004).]

chargincharlie_00
Dirt Roller

Total posts: 10
posted March 18, 2004 07:56 PM  
i agree with 4racer19. if you want to be able to get to your belts use a 2 1/2" fan spacer and set the fan 2" inside the shroud. the engine will run cool, you don't have to get the fan so close to the radiator and you can still get to the belts.

tech355
Dirt Full Roller

Total posts: 73
posted March 19, 2004 12:14 AM  
Run a shroud,you'll be thankful in the long run.

25JHenry
Dirt Full Roller

Total posts: 73
posted March 19, 2004 05:46 AM  
Thanks of the opinions...

Racer0
Dirt Maniac

Total posts: 149
posted March 19, 2004 05:51 AM  
For optimal cooling the fan should be sitting 1/3 out of the shroud anyway. So access to the belts shouldn't be a problem.

racing33A
Dirt Forum Racer

Total posts: 97
posted March 22, 2004 05:14 AM  
what do you guys use to build the round part of the shroud, and how do you fasten it to the box part of the shroud? I have built several of them but the fan always seems to suck the round part into the blades.
thanks
racing33A

Raz_900
Dirt Forum Champ
Total posts: 635
posted March 22, 2004 08:47 AM  
Believe it or not, we chopped up a factory plastic shroud. I think it was from a Ford and was about 8" deep. I was able to cut the front part off (the rad side) then trim it to fit my 28 x 19 rad. With the GM 4 blade 19" fan, it's about perfect. Almost like it was meant for it.

It's nice 'cause I hold it to the rad with 4 nylon ties and it's still bolted together with 2 bolts on each side. So, snip 2 tie wraps and take out 4 bolts and the top half comes off. The opening is like 21", so it wouldn't work for anything but a 19" fan. And the factory plastic won't suck into the rad at speed.


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