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Tractor Pulling Discussion Forum

jd g puller stuck in an a

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jd g puller

10-13-2003 16:29:35




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I am thinking about stroking my 41 jd a. What is the most I can go with out moving the spark plugs? Dose any one have one of these cranks for sale? Do i use stock rods and m&w's. Thanks Larry




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Mike in Mo

10-14-2003 07:15:09




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 Re: jd g puller stuck in an a in reply to jd g puller, 10-13-2003 16:29:35  
Larry
E-mail me or look under classifieds. search for "crankshaft" as I have one for sale. Mike



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moveage

10-13-2003 20:27:06




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 Re: jd g puller stuck in an a in reply to jd g puller, 10-13-2003 16:29:35  
moving the spark plugs isn't an issue...you use shorter pistons, rods, or deck plates to get around that. 9.25" stroke is reliable in an A. You can go bigger but it's already a tight fit. If you go that big with the stroke you probably won't be using stock rods anymore.



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Jd Puller

10-13-2003 22:19:14




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 Re: Re: jd g puller stuck in an a in reply to moveage, 10-13-2003 20:27:06  
Well about the most you can stroke an A is 1/4 inch because of the rear plate in the crank case. and thats about all you can go with you moving the spark plugs. Using shorter pistons is kinda defeiting you purpose of getting more power because you will lower your compression and then all you have is a long stroke. Allthough you may have, lets say, a 7 inch stroke, all you will have is a farther travel of the piston witch will help you but not if you dont have the compression. I have a 37 A that is stoked 1/4 inch and bored only .45 over but I have a set of donuts in it that I designed and machined out of aluminum that raise the compression to 8:1 witch is about all you can crank by hand. My Jd does very well in the 3500-4500 pound class and the 4500-5500 pound class pulling for percentage. In Distance classes I weight it on up to the 5500-6500 pound class and do well if I balance the weight.

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Jeremy Brault

10-15-2003 06:34:05




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 Re: Re: Re: jd g puller stuck in an a in reply to Jd Puller, 10-13-2003 22:19:14  
I do not understand what you mean by moving the spark plugs. please explain it to me more. i have mine stroked to 9, and it ran good with out moving the plugs.



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...

10-14-2003 05:21:27




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 Re: Re: Re: jd g puller stuck in an a in reply to Jd Puller, 10-13-2003 22:19:14  
You can cut the back of the crankcase out. You'll have to build pans to keep the oil separate though. This is a very common practice. Cam clearance will be a problem. At 9.25" you'll have to turn it down to the size of a pencil for everything to get by. The biggest A I know of has a 10.125" stroke, he had to move the cam.



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Jd puller

10-14-2003 11:59:57




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 Re: Re: Re: Re: jd g puller stuck in an a in reply to ..., 10-14-2003 05:21:27  
you can build pans in there but why? just run engine oil in the rear end. for all the more a puller is being ran engine oil will lubercate the gears and bearings good enough. doing it this way though takes a lot of oil to fill everything.



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Jeremy Brault

10-14-2003 10:45:05




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 Re: Re: Re: Re: jd g puller stuck in an a in reply to ..., 10-14-2003 05:21:27  
I tried this, My a ran for about 45 minutes, then the cam broke. it was turned to 1/2" dia. it will not work. I have 9 inches of stroke. You have to grind a flat spot in the camshaft.
Jeremy



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Jeremy Brault

10-14-2003 10:44:41




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 Re: Re: Re: Re: jd g puller stuck in an a in reply to ..., 10-14-2003 05:21:27  
I tried this, My a ran for about 45 minutes, then the cam broke. it was turned to 1/2" dis. it will not work. I have 9 inches of stroke. You have to grind a flat spot in the camshaft.
Jeremy



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JDGnut

10-14-2003 15:16:26




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 Re: Re: Re: Re: Re: jd g puller stuck in an a in reply to Jeremy Brault, 10-14-2003 10:44:41  
Did you have the Cam ground all the way around??? Usually they need to be time-ground.. only ground where the rods are going to be.. Mine usually are a little thinner in the middle than the outside.. depending on what I use to grind the cam... JDGnut



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