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Cooling fans?


89blaze's Avatar
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02-05-03, 03:37 PM   #1  
Cooling fans?

Anyone know how much CFM a stock fan pulls? I have an 89 blazer, 350cid, th400, and tow package. I need a new fan clutch or change to an electric one, and need to make sure I get a fan big enough.

 
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bejay's Avatar
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02-05-03, 05:21 PM   #2  
i would just suggest throwing a new fan clutch on it by far the cheapest route, are you could also install a flex fan with correct extension and do away with clutch all together the correct size extension should leave about 1/4 of the width of the fan blades sticking out of the fan shroud the rest of the blade should be inside the fan shroud.

 
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02-05-03, 06:26 PM   #3  
Just get a new clutch. The stock fan likely moves more than enough air, provided the clutch is working properly.

Avoid the flexi-fans, those things are LOUD, and once up to speed, you've got enough airflow that the fan doesn't need to be turning that fast anyway.

 
89blaze's Avatar
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02-05-03, 06:59 PM   #4  
I was trying to get a little more power to the pavement and as many miles to the gallon I can. I have read that the lack of a belt driven fan will help performance.

 
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02-05-03, 07:13 PM   #5  
The belt driven fan will slow the rev up a bit, but if you switch to an electric, you're simply changing the load from physical, to electrical and back to physical, as the electrical load from a fan with reveal itself as extra load to the alternator, and hence, the engine. You will not see any performance gain on the street from any type of fan you install.

 
bejay's Avatar
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02-05-03, 07:14 PM   #6  
not enough that you would even notice a difference.

 
89blaze's Avatar
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02-05-03, 08:16 PM   #7  
Thanks for the insight. I didn't think of it that way. Off to get a fan clutch.

 
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02-06-03, 06:39 PM   #8  
Joe_F
I agree. Zero benefit to a flex fan on this horse.

 
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