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11-29-2017, 08:40 PM | #1 |
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Join Date: Oct 2015
Location: San Tan Valley, Arizona
Posts: 313
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Standard vs heavy duty fan clutch
So I am building a mild 350 for my 68 c10. I don't want to use electric fans for various reasons. My stock 307 has no clutch on the fan, so I want to upgrade to a fan clutch on the new motor. For some reason the heavy duty ones are 2-3 times the price. Are they worth it? I am going to be using an aluminum radiator and a fan shroud. Thanks!
Bill |
11-29-2017, 09:26 PM | #2 |
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Join Date: Feb 2013
Location: central California
Posts: 2,726
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Re: Standard vs heavy duty fan clutch
Since you live in Arizona I kinda think the h.d model is a good call. Especially if a/c factors in to your plan. I run the h.d model myself and its pretty beefy.
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11-29-2017, 09:54 PM | #3 |
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,472
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Re: Standard vs heavy duty fan clutch
You didn't mention what fan you are using. If you had a flex fan with the solid connector, replace with a 5 or 7 blade OEM fan.
On my 75 with a stock 350, a standard clutch works fine. I have the 7 blade fan. Never a heat problem, even when towing a boat + ~800lbs of crap in the bed on a 100+ day running the AC. I found the HD versions fully engaged when the temps were way too cold. Nothing like running at 70 with the 7 blade fan at full RPM when the motor isn't up to temp yet. Could barely hear the dual exhaust over the fan roar. |
11-29-2017, 10:24 PM | #4 | |
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Location: Hill Country
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Re: Standard vs heavy duty fan clutch
Quote:
this right here. not to mention aluminum rads transfer heat faster. |
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11-29-2017, 11:08 PM | #5 |
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Join Date: Feb 2013
Location: central California
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Re: Standard vs heavy duty fan clutch
http://www.haydenauto.com/featured%2...s/content.aspx good reading here. Are you looking at the ones with the thermal control? I have that style of heavy duty. It's a Hayden brand part# 2747 mated to a 6 blade 18" solid metal fan with a 2.5" pitch. I don't hear any excess noise. I'm not saying that the others are wrong, just that mine seems fine.
Last edited by AcampoDave; 11-29-2017 at 11:47 PM. Reason: added blade pitch of my fan |
11-29-2017, 11:33 PM | #6 |
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Join Date: Oct 2015
Location: San Tan Valley, Arizona
Posts: 313
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Re: Standard vs heavy duty fan clutch
I guess I should have mentioned that I don't have A/C. I Was thinking one of the thermal units. The fan on my current motor is the 4 blade fan without a clutch that gm installed at the factory. I imagine anything will be an improvement there. I will need to pick up a fan as well. 6 and 7 blade fans seem to be the most common type. Is there much of a difference?
Bill |
11-29-2017, 11:55 PM | #7 | |
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Join Date: Oct 2015
Location: San Tan Valley, Arizona
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Re: Standard vs heavy duty fan clutch
Quote:
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11-29-2017, 11:57 PM | #8 |
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Location: Centrally located between Houston, Austin and Waco. BCS area.
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Re: Standard vs heavy duty fan clutch
I got a 5 blade clutch fan from the salvage yard for about $40 years ago. I've been using it for years with no problem. Only thing you have to watch out for is the water pump pulley bolt pattern matching.
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11-30-2017, 12:14 AM | #9 |
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Re: Standard vs heavy duty fan clutch
That and one off of a serpentine accessory drive is designed to turn the opposite direction.
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12-01-2017, 12:04 AM | #10 |
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Location: central California
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Re: Standard vs heavy duty fan clutch
I think I read somewhere that fans with odd numbered blades help reduce air turbulence.
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