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Tractor Pulling Discussion Forum

John Deere B

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JDG70

07-11-2005 06:10:40




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How far can you stroke a B. I've heard different numbers.




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LWD

07-11-2005 20:23:46




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 Re: John Deere B in reply to JDG70, 07-11-2005 06:10:40  
think 180 fire, gives good return for the buck.



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JD B in SD

07-11-2005 19:00:55




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 Re: John Deere B in reply to JDG70, 07-11-2005 06:10:40  
No gears get in the way.Go billet so the crank dont break.5.75 or 6.00 by 8.125 should be real competive in div 4.



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jd b puller

07-11-2005 14:51:34




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 Re: John Deere B in reply to JDG70, 07-11-2005 06:10:40  
JDG70 - Just my opinion, but you"ll probably get your a$$ handed to you in div IV. The AC"s, Farmall H"s, and Small Olivers will likely eat your lunch.

The B"s can be really tough at Div III (3.5-4mph)

Mines" fairly stout and I won"t go up there.

Out of curiosity, what kind of $$$ did you get for quotes on a billet crank? How bout a billet cam? Mine is less than 1/2" thick in places.

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JDG70

07-12-2005 05:25:06




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 Re: John Deere B in reply to jd b puller, 07-11-2005 14:51:34  
The quotes vary around 4500 for a crank up to 5500. All depends. Does anybody know of someone whose had one done. Were hoping to compete in Div 4 if not we'll pull it in Div 3 and when we get the G done pull it in 4.

Everybody thanks for the information as this will be our first B.



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Drew

07-11-2005 15:31:37




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 Re: John Deere B in reply to jd b puller, 07-11-2005 14:51:34  
I have heard of close to $6000 for a big G crank, so I'm guessing you may be looking at somewhere in the $5000 neighborhood for a B crank.



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JDTH

07-11-2005 09:46:33




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 Re: John Deere B in reply to JDG70, 07-11-2005 06:10:40  
There is a bunch in SD that has a B with just over 8" of stroke. LOTS of grinding and cutting. 7.5-7.75" works well.



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JDG70

07-11-2005 12:33:51




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 Re: John Deere B in reply to JDTH, 07-11-2005 09:46:33  
Thanks for the info. Were thinking about building one this winter to pull Div 4 next year. More than likely it will be coming out with a billet crank. So just getting a feel on what you can go.



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Tyler Neff

07-11-2005 06:13:20




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 Re: John Deere B in reply to JDG70, 07-11-2005 06:10:40  
I believe 7.5 works nicely. I think. Ive never built one but just from hearing people talk Im pretty sure.



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b info

07-11-2005 15:59:34




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 Re: John Deere B in reply to Tyler Neff, 07-11-2005 06:13:20  
How big you go is all a matter of making it fit AND holding it together. It also depends on what year tractor you are putting it in. The oil filter pressure head can get in the way with the bigger strokes. On the 41-46, they are in the center and to the back and don't really get in the way. On the 47 and up it is on the left hand side and is a real pain on the larger strokes.
7 - nice packaging, reliable, good power - You have to grind a little off the top case.
7.5 takes a lot of work, less reliable, a little more power - You have to cut slots in the top case.
7.75 takes days - less reliable, a little more power but if done right should last - bigger slots in the top case (past the governor housing gasket)
8.125 - same time as 7.75 but journals are smaller. A little more power but it WILL break.

If your going billet, maybe you could make it live at 8.125, better make your rods custom too. That gear behind the #2 con rod is a bit of a limiting factor too. Some guys have had to chuck up the gear and take a little off the teeth to make it fit.

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Big Jugs

07-14-2005 19:11:49




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 Re: John Deere B in reply to b info, 07-11-2005 15:59:34  
Unfortunately, bigger "aint always better"! Maybe go with something a size or two smaller than was posted here and spend a little more time tuning, timing,. It's alot more fun to pull week after week than to fix week after week. Just experience talking, that's all. Do as you wish.



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