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Ford 9N, 2N & 8N Discussion Forum
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Hey Hobo re:fan

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hvw

06-17-2005 07:36:50




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Would it work just as well to drill a 2" hole in the rear of the fan housing where the motor is bolted down?




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hvw

06-17-2005 18:41:05




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 Re: Hey Hobo re:fan in reply to hvw, 06-17-2005 07:36:50  
It did! I'm sitting back in the breeze having a cool one. It's amazing how much air these fans put out. I'll be on the lookout for another one.



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Hobo,NC

06-17-2005 15:39:39




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 Re: Hey Hobo re:fan in reply to hvw, 06-17-2005 07:36:50  
Been hot cherr so AC work is good and I have not had time to reply all I kin say is try it. Did block'n off the air flow help ??.



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hvw

06-17-2005 09:01:53




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 Re: Hey Hobo re:fan in reply to hvw, 06-17-2005 07:36:50  
Some of you know that I've been fooling with a $%#@*@#^ volkswagen(I think that's enough letters for what I'm thinking) and frequently go to some of the vw boards. But I'm constantly reminded what makes the N board a great success. You can ask a question on virtually any problem and a bunch of people will have an answer. You boys have helped me again. Thanks!



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Rob

06-17-2005 08:44:25




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 Oh yeah... in reply to hvw, 06-17-2005 07:36:50  
It will move more air faster with most of the discharge blocked like I described.
You can try blocking 1/2 to 3/4 to see what works best with your set up.



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Rob

06-17-2005 08:40:56




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 Re: Hey Hobo re:fan in reply to hvw, 06-17-2005 07:36:50  
You won"t believe this but I"ll tell you anyway. On that squirrel cage you need to block the air discharge to prevent the motor from running hot. Quick proof: cardboard and duct tape and block 2/3 of the squirrel cage discharge, run it notice it doesn"t over heat or spark. Not intake on the sides, but the square discharge.

The motor is free-wheeling and operating at the top of the curve at high amps. You block the discharge you load the motor and it drops down on the curve and pulls fewer amps and runs cooler; and properly.

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Bob

06-17-2005 21:57:23




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 Re: Hey Hobo re:fan in reply to Rob, 06-17-2005 08:40:56  
Rob is ABSOLUTELY correct, and as a matter of fact, we discussed this very scenario on here maybe a year ago. Simply partially restrict the fan's output until the load current of the motor is brought down into it's operating range, and it runs steady. Having a clamp-on ammeter, and knowing the nameplate FLA of the motor would help.

Restricting the fan's output does the same thing as the furnace and ductwork did in it's original application. Running without restriction, it simply moves more air than it was designed to, and overloads the motor.

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Rob

06-18-2005 05:07:58




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 Re: Hey Hobo re:fan in reply to Bob, 06-17-2005 21:57:23  
You"ll move more air with the restricted discharge. It"s about static pressure and the perfomance curve. Static and suction pressure, RPM, and HP are all important. Sometimes more HP will move less fluid (gas or liquid) or not even work at all.
You"ll see the same thing with water pumps. Put some discharge piping on them and they move a lot of water, without the piping they just spit and spew and the motor overheats and trips out. Suction connection might play a big part also.
If you get one part of the situation too wrong, there"s not much you can do about anything else that will make it work right.
Performance curves are included in most any blower or pump manual, maybe all of them, but most laymen don"t believe what they understand about them. They see where a pump or blower shows to move more fluid with a 1/2HP motor than with a 3/4PH motor and their eyes roll back in their heads and they just turn the page.

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