What size fan? - Team Camaro Tech
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post #1 of 33 (permalink) Old Apr 28th, 19, 09:33 AM Thread Starter
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Frank
 
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What size fan?

What size fan blade (Mechanical w/fan clutch, not electric) works best with the big block shroud? 16", 17", 18", 19" or 20"? I assume bigger is better right? But what fits?
I have not purchased the shroud yet so trying to get an idea before hand. It's going on an aftermarket aluminum radiator so i'm sure i'll have to modify brackets for the shroud. The car had/has a chrome shroud that i'd like to replace. Just looks out of place to me
Thanks

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post #2 of 33 (permalink) Old Apr 28th, 19, 09:55 AM
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Re: What size fan?

well, I am running a SB with a stock BB fan shroud and I am pretty sure mine is a 17". it is a Derale HD stainless belt driven fan. my limit on the engine is 6200 Rs the fan is rated to 10,000 Rs
no cooling issues with my 10-9 -1 compression engine
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post #3 of 33 (permalink) Old Apr 28th, 19, 10:01 AM Thread Starter
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Re: What size fan?

Quote:
Originally Posted by flat tire View Post
well, I am running a SB with a stock BB fan shroud and I am pretty sure mine is a 17". it is a Derale HD stainless belt driven fan. my limit on the engine is 6200 Rs the fan is rated to 10,000 Rs
no cooling issues with my 10-9 -1 compression engine
Does it look to have a little more room to go bigger if you wanted to? I'll probably be getting one of the Derale fans from Summit along with the shroud. Trying not to have to make multiple trips.

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post #4 of 33 (permalink) Old Apr 28th, 19, 10:16 AM
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Re: What size fan?

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Originally Posted by Just 1 More View Post
Does it look to have a little more room to go bigger if you wanted to? I'll probably be getting one of the Derale fans from Summit along with the shroud. Trying not to have to make multiple trips.
I wish I could answer your question, but I am still using BB frame mounts, so I am not sure
with my SB and BB frame mounts and the BB shroud , NO. there is no more room in my set up. I have about 3/16" clearance
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post #5 of 33 (permalink) Old Apr 28th, 19, 11:01 AM
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Re: What size fan?

I have BB shroud for SB (AC car) and use the 5 blade 17". There is about 1/2" max space left all around so a 18" would hit shroud

I have the 23" BB radiator and fan clutch
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post #6 of 33 (permalink) Old Apr 28th, 19, 12:32 PM
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Re: What size fan?

Just did the same thing you are about to do, bought a Cold Case BB radiator off of Eric on this site, running a 17" 6 blade Derale fixed fan.
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post #7 of 33 (permalink) Old Apr 28th, 19, 05:04 PM Thread Starter
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Re: What size fan?

Quote:
Originally Posted by LeeC View Post
Just did the same thing you are about to do, bought a Cold Case BB radiator off of Eric on this site, running a 17" 6 blade Derale fixed fan.
You look like you have room for 18+

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post #8 of 33 (permalink) Old Apr 28th, 19, 08:46 PM
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Re: What size fan?

OP

If you are buying a stock shroud it will be 19" fan opening....aftermarket/Home Made ones can be any size. Clutch fans with long necks and/or spacer that are closer to radiator you can run a larger fan as the shroud is shorter than stock and with a wider opening

Assuming your shroud lands dead nuts centered to your WP you want 1/2" of clearance between fan and shroud all around.

Reality is the shroud and motor/WP are not dead nuts centered so a 19" fan shroud opening using a 17" fan gives you the "wiggle" room of the shroud & motor being slightly off dead buts center in terms of WP shaft and 19" opening of a fan shroud

You want 1/2 of the fan blade to be inside the shroud and 1/2 out.
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post #9 of 33 (permalink) Old Apr 29th, 19, 12:35 AM
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Re: What size fan?

I have a stock clutch fan, 17" with stock BBC shroud. The shroud opening is 20", so there is room for a larger fan.

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post #10 of 33 (permalink) Old Apr 29th, 19, 01:27 PM
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Re: What size fan?

Quote:
Originally Posted by Just 1 More View Post
What size fan blade (Mechanical w/fan clutch, not electric) works best with the big block shroud? 16", 17", 18", 19" or 20"? I assume bigger is better right? But what fits?
Yes, Bigger is better when it comes to fans. You should easily be able to get a 17-19" fan in the factory shroud opening.

However, trying to find a nice way to say you are spending too much time on the wrong product.

With an OEM shroud and any of the mechanical fans suggested, you're going to generally be 10-15% cfm flow range worst to best.

The real difference is going to come when you have to make the radiator decision. If you make a wrong choice, it's an expensive and time consuming mistake. Just sayin'.

I don't want to jack this thread so if you are interested in my ideas on the rad, shoot me a PM.

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post #11 of 33 (permalink) Old Apr 29th, 19, 02:46 PM Thread Starter
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Re: What size fan?

Quote:
Originally Posted by Ccass View Post
Yes, Bigger is better when it comes to fans. You should easily be able to get a 17-19" fan in the factory shroud opening.

However, trying to find a nice way to say you are spending too much time on the wrong product.

With an OEM shroud and any of the mechanical fans suggested, you're going to generally be 10-15% cfm flow range worst to best.

The real difference is going to come when you have to make the radiator decision. If you make a wrong choice, it's an expensive and time consuming mistake. Just sayin'.

I don't want to jack this thread so if you are interested in my ideas on the rad, shoot me a PM.
I already have the rad .. re-using the aluminum one that was in the car. Never over heated and always stayed around 180ish w/180 t-stat

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post #12 of 33 (permalink) Old Apr 29th, 19, 03:03 PM
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Re: What size fan?

ah! I apologize. I misread that. I now see it's just the shroud you didn't purchase.

Normally, the radiator will dictate the OEM shroud you can mount and that will dictate the biggest fan you can fit. The BB and SB radiators had different shrouds and they are not easily interchangeable. So you want to confirm what your radiator was built for. Then you should be all set to choose the biggest fan with the most blades. Either way, I'd go with the 6 blade AC fan or an aftermarket copy as mentioned in some of the above posts.

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post #13 of 33 (permalink) Old Apr 29th, 19, 05:45 PM
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Re: What size fan?

Factory data is here: CRG Research Report - 1967-69 Cooling Systems If you purchased a repro radiator meeting factory specs and mounting design, the rest will fall into place. A factory design will have no issues cooling your engine.
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post #14 of 33 (permalink) Old Apr 30th, 19, 06:10 AM Thread Starter
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Re: What size fan?

Quote:
Originally Posted by Sauron67MM View Post
Factory data is here: CRG Research Report - 1967-69 Cooling Systems If you purchased a repro radiator meeting factory specs and mounting design, the rest will fall into place. A factory design will have no issues cooling your engine.
The core support is about the only thing "factory design"

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post #15 of 33 (permalink) Old May 5th, 19, 05:39 AM Thread Starter
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Re: What size fan?

I ended up going with an 18" fan and big block shroud. Made a few snips and cuts and shroud mount to get the shroud to fit the aluminum radiator and it fits great. Had to re-position the radiator on the core support which centered it up much better than before. I'm sure it will need to be tweeked some once all the body panels go back on but the rad mounts are oblonged just for that.

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