How many blades does the best GM mechanical fan have? I got one with 7 yesterday.. - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-08-2012, 09:15 AM
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hey thanks cobalt, good info.
My truck was hitting 220* in traffic without any ac installed. Before I start the process of installing the AC system I figured id better solve this first. New fan clutch, radi, water pump, thermo, trans cooler with fan, and was able to move the fan about an inch closer to the shroud lol. Fans still about 2" out of the shroud, guess im gonna try to extend the shroud next.

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Old 09-08-2012, 10:22 AM
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What is the fixed, 4 blade fan good for?
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Old 09-08-2012, 11:39 AM
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I think it came on vette's but im not really sure why.
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Old 09-09-2012, 10:06 AM
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Quote:
Originally Posted by against all odds View Post
What is the fixed, 4 blade fan good for?
Simplicity- it will likely never break or be the cause of an overheating problem due to its failure.

They're cheap to make, light weight, not particularly RPM limited, and in cases where they give sufficient airflow there's nothing particularly "wrong" w/them- although a correctly sized fan using a clutch will use less energy in many cases and cool just as well if not better.
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Old 09-09-2012, 11:37 AM
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What i'm trying to get at is i'm interested in possibly using an engine for stationary power use. So the engine would only turn 600-1000 rpm all the time.

Would a clutch fan work well in this situation as opposed to a fixed blade? Considering that the rpm is rather low would the supposed energy savings from a clutch fan be negligible at this point?

i'm thinking fixed would be simplier and wouldn't really consume all that much power at 650 rpm?
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Old 09-09-2012, 11:42 AM
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If the engine is at idle making little power,almost any fan with a decent rad is more than adequate.If the engine is stationary then any auxilary fan will work fine. When a car is on a dyno making full power a small aux fan is usually placed in front of the car with no problems.You could probably use a rad from a big truck and no fan. A dimple core rad with a small fan. A water reservoir,,,,
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