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Tractor Pulling Discussion Forum

Question for JD guys...engines

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Aaron SEIA

08-04-2004 06:41:40




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I was talking to a customer of mine this morning about antique pulling who doesn't think you can do as much "tweaking" to a 2 banger engine as the Massy and IH guys can do to their 4's. I have been a lurker here for a while, but don't know anything about JD's to understand what all some of you are talking about. So...without giving away any secrets (my e-mail works if you want to), what can be done to some of those pullers you guys talk about. How many cubes do you start with, how many do you end with, HP before and after, etc, etc. Thanks
Aaron SEIA

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ToddF

08-04-2004 09:14:26




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 Re: Question for JD guys...engines in reply to Aaron SEIA, 08-04-2004 06:41:40  
I have a JD70 that I have done some work on. I don't consider myself a hard core puller, I pull three times a year generally. Like many pullers do, I had the machine work done by a professional and did the disassembly, clearancing in the crankcase and reassembly myself. I spent about $2200 all said and done, not counting my own time. The stock bore and stroke was 5.875" x 7.00" to yield 379 ci. @ 45 Hp. I bored the block to 6.123" and stroked the crank to 9.750". I used aircraft pistons and welded connecting rods (Keith Merfeld did all the machine work and supplied the parts: 563-582-8710). The result is around 574 ci. @ 80? Hp. I don't really have access to a dyno and the one I tried it on had an oil problem and surged so I'm not very confident about the HP #, it could be more or less. I suspect that the lugging torque at lower rpm than rated pto speed is where the biggest gains have been made. I did not do any porting on the head or intake other than cleaning out any big casting flash or imperfections. I did drill out the seat in the carb to improve fuel flow into the float bowl, not sure that I had to. I have not rejetted, but the few pulls on the dyno before it quit (the dyno) I kept opening the power valve, and the last pull I it all the way open, and it runs the best there. At this point I don't really know if I'm at the optimum air fuel ratio or if it needs more fuel, I would like to try bigger jets so I can turn the power valve back in some.

I would be happy to discuss any questions via e-mail or phone also.

ToddF

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buickanddeere

08-04-2004 10:49:45




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 Re: Question for JD guys...engines in reply to ToddF, 08-04-2004 09:14:26  
The fuel metering from a 70/720 all-fuel carb run more flow. It's all in Robert's carb cataloge



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buickanddeere

08-04-2004 10:49:43




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 Re: Question for JD guys...engines in reply to ToddF, 08-04-2004 09:14:26  
The fuel metering from a 70/720 all-fuel carb run more flow. It's all in Robert's carb cataloge



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2 Cylinder

08-04-2004 07:14:29




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 Re: Question for JD guys...engines in reply to Aaron SEIA, 08-04-2004 06:41:40  
The 2 Cylinder tractors are at a horsepower buildup disadvantage with the 4 and 6 cylinder tractors. And they cost about twice the money to power up. I do know there are some JD-G's and 70's that are 40-45 Hp originally that are making 120 hp to 150 hp after crank work and sleeved out blocks. They can do anything to these 2 cylinder engines that can be done to a racing automotive engine. The main determining factor is how big is your wallet, a 120-150 hp 2 Banger will hit your pocket book for around $10,000 (just for the motor parts), give or take a few thousand unless you have your own machine shop . I'm sure there will be others that will post that can shed alot more light on this subject than I can.

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DCTOM

08-04-2004 06:56:35




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 Re: Question for JD guys...engines in reply to Aaron SEIA, 08-04-2004 06:41:40  
DC CASE 260 CI ALL YOU NEED



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BUDD

08-04-2004 07:26:47




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 Re: Question for JD guys...engines in reply to DCTOM, 08-04-2004 06:56:35  
Yes that is rite. All you need is an OLD DC CASE and you will need to pull your hat way down on your fore head so no will reconize you on that UGLY tractor! LOL

BUDD )"":""(



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