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Todd
03-29-2002 08:10:42
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Re: Re: Re: Div. 3 JD B in reply to Jerry, 03-29-2002 06:49:00
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With a 4 spd it would have to be a 1939-1940 model tractor. The 5" power block is a good start. To be somewhat competitive in the class and with WC Allis you will have to
A: stroke the crank at LEAST 1" which will make the stroke 6 1/2 inches. (some go more)
B: port polish the head, install model A valves
C: Gas manifold
D: Use a dltx 71 (late A carb), or DLTX 51 (G carb)
E: Use a 50 or 520 cam
F: Use a distributor from a later model with beefed up ignition or pulling mag. (Dist set up is cheaper)
G: you will have no petcocks, so unless you are willing to tug hard you will need a different flywheel and starter.
The early B in opinion is the hardest 2 cylinder to build, and you will need a lot to make her pull right. Track conditions, tire size, and chain length make differences in how strong the tractor must be. I pull a 1937, the chain length is shorter compared to most clubs, and the tracks down here are mostly red clay. My setup is:
5" power block
6 3/4" stroke
late B head ported, etc., with A valves,
520 cam,
Big nut G carb,
offset rockers,
electronic ignition,
compression pumps about 185 per cylinder
13.6 X 38 tires.
WTW is very knowledgable about B pullers, and I'm sure you will get a reply from him. Good luck.
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