Flex Fan vs Clutch Fan

[Tatsadasayago]

Good idea. You didn't have balance issues with that, though?

As long as that center button is on the water pump flange, balance is not an issue unless the cutting got seriously crazy.

[Tad]

The Hayden 2797 is no longer available in a "slotted" bolt pattern. You have to get a HD clutch (not Severe Duty) instead. IIRC, I used a mid to late 80's Chevy truck to find one with the right hub diameter, etc.

I simply cut it with a zip wheel, works fine for the AMC V8's that way.
Have one on the BBCaddy in the Pushmobile too, that baby can move some air.

Good idea. You didn't have balance issues with that, though?

None.
As Jim noted it centers on the water pump snout.

On a side note there is also a Ford version of the severe duty fan clutch.
We run it on Em's '96 Grand Marquis and my '91 F350, they are some air moving monsters.

[tara]

hi, does someone know which is the right model of his HD fan clutch for a 327 Vigilante AMC ???
thanks
Tara

Some of this was cut and pasted from the 'Mothership'

The 2797 is the Heavy/Super Duty version of the Hayden Fan Clutch..

The regular fan clutch probably spins at 60% of engine rpm.
The next up spins at around 70% engine rpm.
The 2797 spins at 90% of engine rpm.
The 2797 IS LOUD, as it moves more air all all engine speeds.

This means that you get superior low rpm, like crawling through the desert in 115-degree F temps with the AC full on, at 20mph or less, and still keep cool, with other mods in the system.

http://www.haydenauto.com/upload/hayden ... clutch.pdf

[44bz]

hi, does someone know which is the right model of his HD fan clutch for a 327 Vigilante AMC ???
thanks
Tara

Some of this was cut and pasted from the 'Mothership'

The 2797 is the Heavy/Super Duty version of the Hayden Fan Clutch..

The regular fan clutch probably spins at 60% of engine rpm.
The next up spins at around 70% engine rpm.
The 2797 spins at 90% of engine rpm.
The 2797 IS LOUD, as it moves more air all all engine speeds.

This means that you get superior low rpm, like crawling through the desert in 115-degree F temps with the AC full on, at 20mph or less, and still keep cool, with other mods in the system.

http://www.haydenauto.com/upload/hayden ... clutch.pdf

From everything I've read the consensus is that fan clutches for the 327 are no longer available. That being said, I ordered one listed for an ambassador with 327 on rock auto awhile back and it looks just like the one in your post. I bolted it to an nos fixed blade fan and tried to install it but there wasn't enough room between the fan and radiator. I've never had any engine temp issues without a fan clutch, currently I have a 7 blade flex-type fan that was pulled from a junkyard 327. I'm not sure if it's OEM or aftermarket though.


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[rapom]

https://www.youtube.com/watch?v=ZXdLgaFXZzs

If I remember correctly, clutch fan is the way to go for less parasitic draw on HP
This is a fun program to watch.