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Tractor Pulling Discussion Forum

Fly Wheel

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Mpuller

02-21-2004 15:21:19




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What RPM can you safely run in a Farmall M, if you are running a stock fly wheel and clutch, 3500 ??




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John D

02-23-2004 09:01:43




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 Re: Fly Wheel in reply to Mpuller, 02-21-2004 15:21:19  
Without getting into a bunch of math or physics I'll through out a number for you. In modern times most things are engineered with a 30% saftey factor. Not sure what they used for a saftey factor during the M days. So you could say 30% over factory rated would be marginal, but ok. Now that number was actually intended for a new flywheel. Yours isn't new anymore. Probably has a few heat cracks in it from clutch challenged operators over the years. This being said I would lean more toward 20% over. If you seriously plan to turn the motor 30% or more over stock and have the money to build a truely competative engine at that level, then go ahead and shell out the money for the billet flywheel. The mother of the child in the front row will thank you when your non-cast flywheel doesnt explode. People take some really big chances and don't seem to think about what could happen. If mine came apart and broke my tractor in half then big deal. Pick up both pieces with a loader and dump it on the trailer. But, if it killed someone's child from flying pieces how would I live with that and would the club ever be able to afford another pull? I hope in the future clubs do a better job of inforcing RPM limits. I know of one 'nameless' tractor turning close to 4,000RPM with a stock flywheel. Tractor is factory rated for 1600. WHEN it comes apart someone will get hurt. Probably be his young grand-daughter pulling it when it explodes. Can't imagine having that on my concious. Not trying to be a smarta$$, just want folks to keep in mind these old tractors have alot of tired iron swinging around in em.

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G-MAN

02-23-2004 10:49:39




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 Re: Re: Fly Wheel in reply to John D, 02-23-2004 09:01:43  
Excellent post. There is a lot of luck being pushed out there by guys that really should know better. I'm not a math major, but when you double your RPM, aren't you multiplying the force by 4? So his "M" turning at nearly three times factory RPM would be stressing the flywheel 10 or so times more than stock? Nobody built THAT much of a safety factor into their iron...



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John D

02-23-2004 11:36:15




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 Re: Re: Re: Fly Wheel in reply to G-MAN, 02-23-2004 10:49:39  
That is true G-Man. In this kind of math you have to square everything. A little begins to go along ways when you start looking at the force generated. When you take into account diameter and placement of weight and so forth it gets more complicated to figure, but the simple side is, if you go much beyond 20% the possibility for disaster goes through the roof, literally.



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FULLPULLER#1

02-22-2004 18:34:34




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 Re: Fly Wheel in reply to Mpuller, 02-21-2004 15:21:19  
IT depends on the size of your Ka-nuts!



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farmall

02-22-2004 17:13:59




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 Re: Fly Wheel in reply to Mpuller, 02-21-2004 15:21:19  
Talk about a loaded question!



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