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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