Replacing stock clutch fan with lightweight aluminum one

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Replacing stock clutch fan with lightweight aluminum one

Postby YVRHotRodLincoln » Wed Jun 21, 2017 12:51 am

..anybody done this with any discernible benefit? Was thinking of doing it but would appreciate some 'Mark VII expert' comments first...
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Re: Replacing stock clutch fan with lightweight aluminum one

Postby oldschool1 » Fri Jul 14, 2017 12:27 am

I've never done it. I was lucky enough to score a few OEMs back in the day.
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Re: Replacing stock clutch fan with lightweight aluminum one

Postby YVRHotRodLincoln » Wed Jul 19, 2017 1:19 am

John, was just wondering if there is any weight-saving or is it basically negated by the fact that the with the clutch fan the fan isn't actually turning all the time. If the hard-mounted aluminum fan is turning all the time then the weight you save may be negated by the fact that it's always turning...and supposedly robbing a bit of power...
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Re: Replacing stock clutch fan with lightweight aluminum one

Postby oldschool1 » Wed Jul 19, 2017 7:23 pm

From an engineering aspect, the fixed fan would have to be 110% efficient at idle (750 rpm) with everything running at about 90° F ambient.
The same fan would have to stand up to the maximum rpms of a 302 (4k?). Historically, Go-Fast owners have deleted the clutched fan (and anything else on the belt that they can) to increase HP output. Deleting the clutched fan means adding an electric fan engine side or a pusher fan, grille side. I've been getting 100 - 150 K miles on the clutched fans. Even the OEM clutch in PINKIN (1986) still has some good drag to it.

It will be interesting to see which path you choose.

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Re: Replacing stock clutch fan with lightweight aluminum one

Postby YVRHotRodLincoln » Tue Aug 15, 2017 1:34 am

...thanks John...I'll let you know...Neil
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Re: Replacing stock clutch fan with lightweight aluminum one

Postby oldschool1 » Tue Aug 15, 2017 5:07 pm

You are welcome.
Keep us posted.
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Re: Replacing stock clutch fan with lightweight aluminum one

Postby 90 MarkVII BB » Wed Aug 16, 2017 4:06 pm

I have a question... How does one know if your fan clutch needs replacement?
"Ivory" - 1990 Mark VII Bill Blass Edition
3G Alternator, Arnott Air springs front/rear, hardwired dashcam, Tigerpaw whitewalls, all 4 brake lines new NiCopp, all else factory.
In the works - Backup cam, Addco#415.
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Re: Replacing stock clutch fan with lightweight aluminum one

Postby oldschool1 » Thu Aug 17, 2017 2:37 am

Technically, there is a procedure to follow requiring running the engine at 2000 rpms and measuring the rotation of the fan. The fan should rotate a minimum of 1200 rpms. But this scale was taken from our 1984s and our STEEL fans.

The short answer is; with the car off and cold, if you can spin the fan by hand more than one rotation, it's toast :)
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