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If you go by the fan blades used on the new domestic heat pumps which have a low Db rating, the "curved blades " with the tips swept back are among the quieter fans. A similar automotive fan type is the Hayden brand. I have a large one fitted to the 3 row radiator on my 67 Mustang. It comes with a cowling and covers the entire width and height of the radiator. The engine size is 347 and i have an adjustable thermo-switch fitted. From inside the car i cant hear it kick in but my hearing is not brilliant. :)
Cheers
Al.
 

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This is a CCM (Walker Radiator) fan. Like Al, it is thermostatically operated (a Painless Wiring kit) and is about as quiet as any fan that size can be. Even with my open car, difficult to hear - but too many hours in my young days before OSHA have not helped my hearing either.

 

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Hi Dave, what was that you said.:)
To quote some of my Commonwealth friends "Ehhhhhh", which when I do it, upsets my very soft spoken wife ENORMOUSLY. I had my hearing checked a couple months ago - the graph the doctor showed me was NOT pretty and was told I should see a hearing aid specialist. If I do that, then all those honey do's couldn't stay unheard:eek::D
 

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I "HEAR" what you are saying Dave.:) Everything about the interior of my old American is built for insulation against noise. Those of us who have past careers in the noiseworks are paying for it now. If you come from Queensland Aus, they finish their sentences with """"Ehhhhhh""" or """But""""
That dynamat in my roof, floors, double thickness behind trunk wall,rear, everywhere, has the old ride very quiet.:thumbup: for those of us who are noise intolerant. My wife is also bugged by the "Ehhhh"
Cheers
Al.
 

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I like the curved blades, but there's more to quiet than just blade shape. It's also about cfm, and whether you have enough to cool and not too much to make excess fan noise.
Most of my rides have enough exhaust and engine noise that I don't notice the fan until I'm either out of the car, or I shut the engine off and hear the fan running, or coasting down.
 

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I had a straight blade on the car in my avatar with a 454 Chevy and side pipes. It was louder that the engine and exahust.

Switched to a curved blade and had to add an indicater light so I could tell when it was running.

I added the light because I want to know what is going on at all times.

Just my opinion.


454 RATTLER
 
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