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Old 06-03-2013, 12:39 PM   #1
Gas Stove-bolt
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Default Radiator to fan clearance ???

Quick dumb question....

I am putting in an aftermarket radiator in my 57 Chevy truck. The stock fan hits the bottom tank of the radiator. So, I installed a flex-fan to see if it would work. The bottom of tank to the fan is 1/8 inch. Is this too close? This is a stock (for now) 235 and I don't want to move the support. I would like to stay away from an electric fan if possible.

Thanks
Mick
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Old 06-03-2013, 12:47 PM   #2
mustang6147
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Default Re: Radiator to fan clearance ???

You really need about 1 inch clearance at your closest point. Fans will flex slightly no matter if they are flex or not.... You need to leave yourself room for swapin the water pump ect....

Flex fans are not a good choice in fans either.....
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Old 06-03-2013, 12:57 PM   #3
fossilfish
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Default Re: Radiator to fan clearance ???

X2 on the flex fan. If you can get a fixed pitch steel bladed fan with a heavy duty fan clutch, keep it as close as you dare to the radiator(without a shroud).....inch sounds fine to me. You should not have cooling issues.
If you can shroud it then you need to keep bout 70 percent of the blade outside the shroud. ..as long as the fan fits properly inside the shroud.
Your results may vary
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Old 06-03-2013, 01:19 PM   #4
El Rat
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Default Re: Radiator to fan clearance ???

My guess is the fan will hit the tank @ .125. The above advice (1") is about right. g
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Old 06-03-2013, 01:31 PM   #5
creepjohnny
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Default Re: Radiator to fan clearance ???

Same On the 1" clearance
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Old 06-03-2013, 01:34 PM   #6
larry k
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Default Re: Radiator to fan clearance ???

yes ! 1" is the standard cooling system rule !
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Old 06-03-2013, 01:36 PM   #7
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Default Re: Radiator to fan clearance ???

The engine moves separately from the radiator, thus the 1" clearance.

Go with a tiny bit smaller diameter fan in order to achieve the clearance you need.

Then build, or get, a shroud and you should be golden.
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Old 06-03-2013, 01:37 PM   #8
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Default Re: Radiator to fan clearance ???

Well, how about some pics of your water pump and fan setup?
I'm sure someone will figure out how to get you an inch and keep your good fan.
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Old 06-03-2013, 01:54 PM   #9
drptop70ss
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Default Re: Radiator to fan clearance ???

And throw the flex fan in the garbage, I am one of the many who have had them come apart and make a mess.
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Old 06-03-2013, 02:05 PM   #10
sobpunx
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Default Re: Radiator to fan clearance ???

If flex fans are junk what's a good replacement? (Sorry to hi jack.)
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Old 06-03-2013, 02:32 PM   #11
fossilfish
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Default Re: Radiator to fan clearance ???

Replace junk with fixed pitch steel fan. heavy duty clutch unit
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Old 06-03-2013, 02:42 PM   #12
Jalopy Joker
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Default Re: Radiator to fan clearance ???

yep, without pic of your new set up hard to give positive solutions. have seen some Chevy cars with radiator mounted in front of stock radiator support - gives clearance for fan, etc.
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Old 06-03-2013, 02:54 PM   #13
paintcan54
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Default Re: Radiator to fan clearance ???

My wifes truck the fan is close to center and 3/4 of a inch from the rad cores cools great, the T bucket is almost center and about 2 inches from the core cools good. Both are 4 blade stock fans.
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Old 06-03-2013, 04:35 PM   #14
325w
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Default Re: Radiator to fan clearance ???

Old Aite in Ft. worth, Tx. Sells a large six blade steel fan. I'm sure others do also. You can look at their site and see. If you have a 235 in a 57 truck I don't see why your having an issue. US radiator makes a nice replacement rad.
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Old 06-03-2013, 05:10 PM   #15
HOTRODPRIMER
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Default Re: Radiator to fan clearance ???

Summit offers this steel non flex fan in different sizes. HRP

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Old 06-03-2013, 07:09 PM   #16
bobss396
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Default Re: Radiator to fan clearance ???

Quote:
Originally Posted by HOTRODPRIMER View Post
Summit offers this steel non flex fan in different sizes. HRP

Looks like the old Caddy fans, every one of my stock cars had one. Pulled a lot of air.

Bob
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Old 06-03-2013, 07:40 PM   #17
nunattax
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Default Re: Radiator to fan clearance ???

can you move the rad forward
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Old 06-03-2013, 11:11 PM   #18
Gas Stove-bolt
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Default Re: Radiator to fan clearance ???

Thanks everyone. It is a U.S. but the stock fan hits the bottom tank by a 1/4 inch. There is room for the rest of the fan. I had an old flex fan and it clears the bottom tank by 1/8 inch. I put it on to see if it worked. A smaller blade would work, I never thought of that. I like the 6 blades.
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