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Tractor Pulling Discussion Forum

Big stroke farmall

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1 bad binder

03-09-2004 19:43:05




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What do you think of the 7.75" stroke crank for an M? How big can you bore and keep this stroke without self destructing? I am thinking of 4.635" if I can hold it together. Any body have a big cube motor (>450 up to 540) doing well?




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Marty

03-16-2004 14:48:32




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 Re: Big stroke farmall in reply to 1 bad binder, 03-09-2004 19:43:05  
Call Jim Benjamin (cover of new HOOK mag.) in Webberville,Mi. He can build you a virtually indestructable semi-billet for much less than Shipman's. His work is flawless. Then call Gary Baker in Manchester,Mi. He will put together an almost bullet-proof block for you. They are both perfectionists.



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Chads

03-10-2004 07:40:24




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 Re: Big stroke farmall in reply to 1 bad binder, 03-09-2004 19:43:05  
7.75 could live a good life. The block will have to be looked at carefully. If built well, it could last 5 or 6 seasons before anything drastic happens. I don't think the crank will be the trouble, it will be the cyl walls. If it was me, I would go with a 4.5 bore, and thick sleeves. I have a big cube H farmall, I have ran for 6 seasons, then the block gave up, so I had to repair it. good as new. (fingers crossed) LOL Anyway, no problems on the bottom end, it was the block splitting right down the middle of the deck surface. A big M engine is not too much different than building the H, ya gotta keep on grindin, make that big crank spin!! Just my 2 cents, Chad

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Binder

03-11-2004 03:28:42




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 Re: Re: Big stroke farmall in reply to Chads, 03-10-2004 07:40:24  
With 7.75" stroke what size rod journals are people using? Width of journal? What rod pieces? Are they oiling through the crank? I have heard of guys using oli 77 journals and having to stuff copper tubing from one end of the main oil passage on the side of the block to the other end and running holes in it to spray oil on the crank like a wakasha, is this true? Chad you said a thick sleeve 4.5 bore, do you have any suggestions on what sleeves a guy should think about? Sorry about having so many questions but I am very interrested and would like to be educated. In advance thank you for your information. By the way Great Post and Topic.
Binder

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consider billet

03-09-2004 20:27:20




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 Re: Big stroke farmall in reply to 1 bad binder, 03-09-2004 19:43:05  
you might want to consider a billet crank...they're big $$$$ but it virtually assures you no crank problems, where a welded crank that size will eventually give. You can go up to 5" bore.



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Curious??

03-10-2004 08:58:38




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 Re: Re: Big stroke farmall in reply to consider billet, 03-09-2004 20:27:20  
Where or who does these billet cranks and what kind of money are we talking? Thank You, Curious



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randy hall

03-10-2004 12:47:28




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 Re: Re: Re: Big stroke farmall in reply to Curious??, 03-10-2004 08:58:38  
a couple of years ago shipman quoted me $4800 for a billet crank for a 'm'



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Buzzman72

03-11-2004 06:36:38




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 Re: Re: Re: Re: Big stroke farmall in reply to randy hall, 03-10-2004 12:47:28  
Maybe I'm from the lo-buck side of town, but $4800 just for a CRANKSHAFT for a tractor that, in stock, PRISTINE, condition wouldn't bring the price of the billet crank....and then, to call it a HOBBY...sounds to me a lot like a description I once heard for the lottery:

"It's really just a tax on the folks who can't do the math."

On the other side of the [pile of] coin[s], some people smoke for enjoyment; some people drink for enjoyment; some people spend a comparable fortune on a bass boat and a truck to pull it with, just for enjoyment. It's just that, since I've never made as much as $50,000 in a single year, it's hard for me to imagine spending 10 PERCENT OF PRE-TAX INCOME on JUST ONE ENGINE PART...and then still pay for my utilities and my groceries. But maybe my perspective is warped...I dunno.

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Wild Horses

03-11-2004 08:15:37




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 Re: Re: Re: Re: Re: Big stroke farmall in reply to Buzzman72, 03-11-2004 06:36:38  
Someone's perspective is warped, but I don't think it's yours.
Sure you might get an indestructable crank, but something's got to give. Guess it's just a decission of whether you rather break a crank or blow your block apart. Remember the space for the throw has to come from somewhere.



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Sweeper

03-11-2004 19:38:17




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 Re: Re: Re: Re: Re: Re: Big stroke farmall in reply to Wild Horses, 03-11-2004 08:15:37  
Why not go with a smaller stroke, say 7.5, and have something dependable. You can have just as much fun.



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