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JD 70 for pulling

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Todd

01-03-2000 21:16:03




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My brothers and I bought a '54 JD 70 gas to pull in the antique classes. We're novices at this and hadn't bargained on spun con-rod bearings and having a crank too small to turn! So now we are wondering do we fix the crank to stock specs or consider stroking it? We don't want to break the rules anything beyond interpretation, but are there other performance options we should be considering as long as we've got it apart? Aside from pulling, this tractor will be used to plow a little snow and for the occasional hay ride. Any suggestions would be appreciated.---Todd

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different crank

01-04-2000 12:24:11




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 Re: JD 70 for pulling in reply to Todd, 01-03-2000 21:16:03  
You need another crank to begin with. How small was the journal?



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Brandon Gantt

01-04-2000 12:43:52




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 Re: Re: JD 70 for pulling in reply to different crank, 01-04-2000 12:24:11  
If you have the money you can get your tractor up to about 135 horsepower. I know you boys say that this can't be done but it has. There is a boy around here with a 70 that pulls 20-8-38 cut tires in the 9200 super in third gear. But seriously i would put a crank in about an inch longer while you have the crank out. You should bore the block if you are going to stroke the tractor. If you go so far on a 70 you have to have short pistons. On a G if you go over 8 1/2 which is 1 1/2 inches over you have to have short pistons. Im not sure about the 70 though. I would call an engine builder and talk to him. He can explain this much better than i can.

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Todd

01-04-2000 21:50:35




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 Re: Re: Re: JD 70 for pulling in reply to Brandon Gantt, 01-04-2000 12:43:52  
Can you tell me who to contact to discuss this with? I don't know an engine builder who has bored and stroked a two cylinder. Are short pistons fairly available or will I have to have them custom made? How much stroke can be added with standard pistons? How about changes to the the valve train or the camshaft? I appreciate any input I can get.----Todd



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Brandon Gantt

01-05-2000 16:34:58




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 Re: Re: Re: Re: JD 70 for pulling in reply to Todd, 01-04-2000 21:50:35  
Call kieth merfield at 319-582-8710. He is the man who built the 70 that i mentioned and he is the best in my opinion. He should answer any questions that you have. Should you have him do your crank he should be able to turn the mains up to whatever you want.



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