rad seal kit? For sealing the shroud to the radi? Im gonna use the shroud that came with the truck but the fan is about an inch out of it with a spacer and long shaft fan clutch.
There are also three versions of the Hayden fan clutch - standard, heavy duty, and extreme duty. If you look at the Hayden web site they have some documents that explain when each type of clutch will lock up and how the lock-up mechanism works.
Thanks, I bought a regular duty imperial fan clutch because no matter where i looked i couldnt find a heavy duty one for the buick 231 v6. I took the 7 blade fan off a 350 chevy truck at pick n pull and im just wondering if its actually going to move any more air than the 5 blade i took off....
rad seal kit: seals the air gaps where the rad mounts to the frame.Only allows air to go through the rad. The air cannot go around the rad,only through it
Expect most 7 blade fans to pull more air than a 5 blade fan- providing there is sufficient flow available through the grill/radiator(s). If there isn't, there can be a stalling effect.
For best efficiency fans w/the capability to flow large amounts of air should be used in conjunction w/a fan clutch to allow it to partially free wheel at speeds above where the fan is required to get air through the radiator; some vehicles will have enough airflow through the radiator at speeds as low as 30 mph that the fan isn't needed. This will vary by vehicle due to the grill and air inlet design, etc.
Bottom line is to run only as much fan as is required to cool the engine under the worst conditions it will encounter and no more. If it was cooling OK w/the 5-blade, unless the 5 blade fan had unusually large blades or severe pitch, it should require less energy to spin it than the 7 blade- and would be the "better" choice.
That said, it still comes down to diameter and pitch- even a 7 blade fan can use less energy than some 5-blade fans. 4 blade fans shouldn't be considered unless originality is important or the cooling requirements are trumped by energy savings. In such a case, an electric fan (and even water pump) might make more sense.
Proper positioning of any fan inside the shroud is also important. Less fan is needed when the rest of the cooling system is up to par. More on cooling systems, etc. here.
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.
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.
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?
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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