Converting from Electric fan to clutch fan help please - Team Camaro Tech
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post #1 of 26 (permalink) Old Mar 18th, 19, 05:06 AM Thread Starter
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Converting from Electric fan to clutch fan help please

67 Camaro with bored and stroked 383 fuel injected SBC.

Hey all, I have a good electric fan, but even in this mild 80 deg weather it runs 200+ in traffic with the AC on. I did add AC - I know this will come as a shock, but it gets a tad warm here in S. FL in the summer, so come August, I know I'm gonna be in trouble.

I have a new wide 2 core (as wide as a 4 core) aluminum radiator that did help - but.

The original stock fan was a dinky 4 blade. I want to upgrade to a larger 6 or 7 blade fan and add a clutch, which of course means a new shroud to fit the larger fan. The main reason I want to upgrade is because of the AC. I think I'd be OK with the original fan and shroud without the AC.

Has anyone else done this, and which clutch (I think I should get the heavy duty clutch), which fan and shroud did you use?

Thanks a ton in advance
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post #2 of 26 (permalink) Old Mar 18th, 19, 05:27 AM
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Re: Converting from Electric fan to clutch fan help please

Why not just install a better electric fan? Spal Dual fans with a good fan control.
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post #3 of 26 (permalink) Old Mar 18th, 19, 05:29 AM
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Re: Converting from Electric fan to clutch fan help please

I'm no mechanic but in the same situation as you. Same exact engine, AC, etc... I recently went from a fixed fan to a clutch fan myself. What I found out about the small block shrouds is for non AC small block (21" wide radiator)
is about 5" deep at the top and the shroud with AC is 7 1/2" deep at the top. So in order to get your clutch fan 1/2 in ans 1/2 out you need to know how far your clutch fan sits. I will be purchasing the aluminum radiator for a BB today from Cold Case and a SB radiator shroud for Ac car. Once I get it installed I will have to see how much of an extension piece I will need to get the clutch fan properly centered. Hope this helps.

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Last edited by Duneit; Mar 19th, 19 at 05:00 AM.
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post #4 of 26 (permalink) Old Mar 18th, 19, 07:15 AM
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210 is not really that hot. That said, I like the u blade with the stock shroud. Make sure you get a fan for your type of belt configuration. ( clockwise, or counter clockwise) . the shroud funnels the air over the engine. The shroud alone may help you out. With a aftermarket A/C you can use a standard or A/C shroud, Mine ran 180 all summer here in humid high 90's traffic. Hard to see, but it is a stock 7 blade, with a stock clutch. 4 core brass and copper radiator with a high volume waterpump and thermostat.
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post #5 of 26 (permalink) Old Mar 18th, 19, 07:57 AM
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Re: Converting from Electric fan to clutch fan help please

Several years ago I noticed my Camaro was running hot in traffic. I replaced my stock 4 blade fan with a Hayden 2747 HD clutch and a Hayden (3618) 18 inch six blade fan. This setup worked a little better than the stock fan, but the engine was still running hot in town and the heavy duty clutch never seemed to really engage.

I found an 18 inch 7 blade fan on a 1979 Cadillac in the wrecking yard. I figured if it would cool a 425 CI Cadillac engine it should be able to cool a 327 Chevrolet. The blades have a very aggressive pitch. It bolted right up to the 2747 clutch. I bolted it on the Camaro and when the clutch engaged the belt would squeal. I tried tightening the belt but it still squealed. I tried a new belt with the same results. The combination of the HD clutch with the aggressive fan was just to much for the Camaro's skinny single belt.

I really wanted to run that fan so I located some new pulleys so I could run dual belts. This solved the belt squeal problem. This setup is nice and quiet until the clutch engages and the Caddy fan roars. It pulls and ineradicable amount of air through the radiator when engaged and the engine stays cool even on the hottest days. I have been running this setup for several years and have never seen the engine temperature go past 180.

If your going to run a HD clutch you need to match it to a large aggressive fan that will really move some air.

Stock fan:


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The Hayden 2747 clutch with the Hayden 3618 fan was only slightly better than stock.


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Here is the Hayden 2747 clutch with 1979 Cadillac 7 blade fan and the dual drive belts. The fans look similar but the difference in air flow when the clutch is engaged is substantial. This setup works great!

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post #6 of 26 (permalink) Old Mar 18th, 19, 09:08 AM
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Re: Converting from Electric fan to clutch fan help please

OP

The 67 Camaro with AC had the 23", big block, radiator vs 21". The 23" uses a different fan shroud to cover it......but it is specific to the 327 SB, vs the fan shroud used for BB. BB motors were about 1/2" off center towards passenger side and about 1/2" higher on DS (tilted) to clear steering box. Thus the fan shroud for BB and SB with AC are different. The SB fan opening is centered where the BB one is towards the PS by about 1/2"-1"

I have a 23" radiator (stock not aluminum) in my 67 which I just bought the correct shroud for from Summit (made by OER)

https://www.summitracing.com/parts/oer-3893814

I also have a stock fan clutch I recently bought from Ecklers along with the 5 blade (asymmetrical) fan. All fits perfectly and the fan shroud is the same depth as the SB one was. My fan blades are 1/2 in/out of the fan shroud opening. My fan is 17 1/2" and shroud opening is 19"

IDK how your aftermarket aluminum radiator accommodates mounting of the stock fan shroud but the stock radiator has clips on the side tanks the lower "ears" of the fan shroud go in and the one center top hole for the center shroud mounting bolt
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post #7 of 26 (permalink) Old Mar 18th, 19, 03:34 PM Thread Starter
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Re: Converting from Electric fan to clutch fan help please

Quote:
Originally Posted by Duneit View Post
I'm no mechanic but in the same situation as you. Same exact engine, AC, etc... I recently went from a fixed fan to a clutch fan myself. What I found out about the small block shrouds is for non AC small block (21" wide radiator)
is about 5" deep at the top and the shroud with AC is 7 1/2" deep at the top. So in order to get your clutch fan 1/2 in ans 1/2 out you need to know how far your clutch fan sits. I will be purchasing the aluminum radiator for a BB today from Cold Case and a BB radiator shroud. Once I get it installed I will have to see how much of an extension piece I will need to get the clutch fan properly centered. Hope this helps.
Please check into it, The BB shroud fan hole is off center, not sure how it will align with a SB. A BBC in our cars is offset to the pass side and I believe raised a bit. The BB shroud may be very difficult to make work.
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post #8 of 26 (permalink) Old Mar 18th, 19, 03:36 PM Thread Starter
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Re: Converting from Electric fan to clutch fan help please

Quote:
Originally Posted by SoCal805 View Post
OP

The 67 Camaro with AC had the 23", big block, radiator vs 21". The 23" uses a different fan shroud to cover it......but it is specific to the 327 SB, vs the fan shroud used for BB. BB motors were about 1/2" off center towards passenger side and about 1/2" higher on DS (tilted) to clear steering box. Thus the fan shroud for BB and SB with AC are different. The SB fan opening is centered where the BB one is towards the PS by about 1/2"-1"

I have a 23" radiator (stock not aluminum) in my 67 which I just bought the correct shroud for from Summit (made by OER)

https://www.summitracing.com/parts/oer-3893814

I also have a stock fan clutch I recently bought from Ecklers along with the 5 blade (asymmetrical) fan. All fits perfectly and the fan shroud is the same depth as the SB one was. My fan blades are 1/2 in/out of the fan shroud opening. My fan is 17 1/2" and shroud opening is 19"

IDK how your aftermarket aluminum radiator accommodates mounting of the stock fan shroud but the stock radiator has clips on the side tanks the lower "ears" of the fan shroud go in and the one center top hole for the center shroud mounting bolt
Thank you. I was looking at that shroud, but in the photo it looks like the fan opening is offset to the pass side. Is the photo wrong, or is the opening offset?

Thanks
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post #9 of 26 (permalink) Old Mar 18th, 19, 03:40 PM Thread Starter
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Re: Converting from Electric fan to clutch fan help please

Quote:
Originally Posted by Vega$69 View Post
Why not just install a better electric fan? Spal Dual fans with a good fan control.
I think I'm just done with electric fans. A friend had tons of problems, ended up with like 3 fans, ended up going back to the mechanical fan and it cured everything.

The dual fans would PROBABLY work, but would draw about 50 amps, I'm not sure my alternator would handle that. Also, the dual fans I've looked at are too large for my radiator.
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post #10 of 26 (permalink) Old Mar 18th, 19, 03:41 PM Thread Starter
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Re: Converting from Electric fan to clutch fan help please

Good info Farm Boy, thank you
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post #11 of 26 (permalink) Old Mar 18th, 19, 03:52 PM
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I talked Cold Case today and they advised me to order the small block shroud for ac applications. Not the BB shroud.

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post #12 of 26 (permalink) Old Mar 18th, 19, 06:11 PM
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Re: Converting from Electric fan to clutch fan help please

Quote:
ineradicable
unable to be destroyed or removed

Do you California farm boys really talk like that? LOL
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post #13 of 26 (permalink) Old Mar 18th, 19, 06:22 PM
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Re: Converting from Electric fan to clutch fan help please

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Originally Posted by scblucam View Post

Do you California farm boys really talk like that? LOL

Nah, just a spell check malaprop.

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post #14 of 26 (permalink) Old Mar 18th, 19, 08:39 PM
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Re: Converting from Electric fan to clutch fan help please

Quote:
Originally Posted by Coach62 View Post
Thank you. I was looking at that shroud, but in the photo it looks like the fan opening is offset to the pass side. Is the photo wrong, or is the opening offset?

Thanks
If you have a stock type 23" radiator and a 327 this shroud is plug & play. The hole is off center in terms of the shroud...but the shroud mounts so the hole is dead center to the motor which is center in the car

I just put this on a few days ago on my 23" radiator
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post #15 of 26 (permalink) Old Mar 19th, 19, 03:17 AM
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Re: Converting from Electric fan to clutch fan help please

Why not retro fit one from a 90's Silverado with a 350 in it or an 80's Camaro/Firebird with a 305 in it that had A/C and run a 160 degree thermostat?
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