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Car came with a plastic flex fan, I replaced this with a pictured six blade fan and clutch. (I believe these were a non original replacement kit) Never gave it much thought at the time but I understand that without air con a five blade fan was the original so wondered if the five blade version would be quieter? Six blade fan Six blade fan and clutch.
The fan clutch will have more to do with noise than the fan. A heavy duty clutch will engage more than a standard duty clutch and therefore will have more noise. It will definitely be quieter than the flex fan.
I put an extra idiot light in my dash so I know when my fans are running.
So, over the sound of your exhaust you can actually hear your fan?
Sounds like you need a louder exhaust.
See, simple fix.
Before I put a calmer cam in it, using a phone app db meter, exhaust sound reading 110 db at idle. Had to calm it down some as failed noise test and couldn't make it road legal.
Tried warming the fan clutch up with a heat gun while I had it off the engine, can see the bimetallic "spring" move but makes very little difference to the resistance to the fan spinning, leading me to thinking the fan clutch is too stiff when cold and it never locks when hot so is it defective?
FWIW this setup runs a steady 190 deg when warmed up.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
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Radiator fan question '70 SBC
