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10-05-2020, 12:39 PM | #1 |
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Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 227
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Viscous clutch fan for SBC 350
Out here in South Africa we have to improvise....
I'm, one of those who believe that I would rather have a fan with 300HP driving it than a 0.33HP electrical motor. The flex blade fans also does not appeal to me, so I went with a viscous coupling as found on older Jag XJ6 and XJ12 engines... I have a 74ºC (165ºF) thermostat fitted and with normal driving, temp never goes above 80ºC (176ºF). In traffic, with AC on, I now and then see temp creeping up to 90ºF (194ºF) but that is when the clutch engages and then the temp drops rapidly back to below 80ºC (176ºF)
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
10-05-2020, 01:28 PM | #2 |
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Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,791
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Re: Viscous clutch fan for SBC 350
It looks like you've crafted it well.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
10-05-2020, 01:55 PM | #3 |
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Join Date: Aug 2011
Location: China Spring, TX
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Re: Viscous clutch fan for SBC 350
That found shroud looks more like an actual shroud than any I've seen lately.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
10-05-2020, 02:17 PM | #4 | |
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Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 227
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Re: Viscous clutch fan for SBC 350
Quote:
But I find the viscous clutch rarely engages. The "disengaged" amount of fan rotation is already enough to provide significant air flow.
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
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10-06-2020, 10:48 AM | #5 |
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Join Date: Aug 2012
Location: Oklahoma City, OK
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Re: Viscous clutch fan for SBC 350
Looks good. If you have any pics of the shroud before installation, might post those up as well. And maybe some pics of that AC compressor bracket. Might be useful to folks wanting to add an aftermarket AC to a truck.
Your results with the clutch are similar to mine. I run a standard duty clutch and it provides plenty of spin to the fan to keep things cool without sounding like a jet engine under the hood. The heavy duty version ran things too fast when the cooling just wasn't needed. Running a 195F thermostat here. |
10-06-2020, 11:36 AM | #6 |
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Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 227
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Re: Viscous clutch fan for SBC 350
I don't have pics but I do have these drawings (all dimensions in mm), that may help. No guarantees of course.
As for the AC bracket, I used this: https://www.summitracing.com/int/par...make/chevrolet
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
10-06-2020, 12:09 PM | #7 |
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Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 227
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Re: Viscous clutch fan for SBC 350
But then I thought, its only 4 countersunk cap screws and 2 x 10mm bolts to remove the cowling so I removed it quickly, a 5 min job....
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
10-06-2020, 12:10 PM | #8 |
Registered User
Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 227
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Re: Viscous clutch fan for SBC 350
Pictures are worth a 1000 words right?
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
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