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not sure about these smaller fans but on big truck when pulling a hill and the fan engages I can feel and see the loss in power. been told 25 hp.How much power do you think a fan actually pulls? Granted I'm sure it affects mileage some but will changing the setup get you the increase you are after?
Do you mean the fan comes loose and tears-up the radiator? If so, there's a pretty easy way to protect your radiator from that sort of thing. Off-road vehicles that use mechanical fans will often have a guard on the backside of the radiator that looks sort of like a miniature hoola-hoop, and some type of framework to support it. The idea is to create a smooth circular surface for the fan to smash up against, to keep the fan from tearing up the radiator.on my m923's when the fan clutch goes out it takes the radiator out with it.
OK, finally here on the pictures. You all made me worry that it might be out of ballance by welding, so this is how I re-did the clutch. As you can see there is no welding, I made the adapter by using a washer and a center bolt from a leafspring pack, and a 1 1/2" set coller. As for trimming the fan. I trimed 1/4" wide 1" long on the tips of the blades. The fins are alumium, I dont think that I could have been off enough to make a damaging vibration. Also the new fan with clutch and adapter is still lighter than the orignal steel fan. The clutch and fan are for a 1996 f-350 with a 460 motor. you can see the Napa part # in the picture. I love this mod, the only problem I have found is running the gears out too far, The motor is much quiteter.
Good Luck
PS I cant Spell to well. LOL