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JD G Buildup

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G-MAN

02-25-2002 17:41:42

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Hello gang, I'b back again and still clueless. I'v been giving a lot of thought to this and I think I'v figure out what to do with my G.

.090" overbore, plane the head and block, M&W aluminum pistons, inserted rods, cold intake, a mild cam upgrade, clean up the ports a little, and a Denny's big-nut G carb. I'd also like to modify the stock air cleaner housing to accept a dry element. What do you guys (or gals) think? Is 60 HP achievable with this set-up? Should I mess with the cam? Is a Denny's carb necessary or would a well-rebuilt stock 51 work? I know it probably won't win any pulls, I just want a good-running, good-looking tractor that won't be embarassed. One more question. Would the cold intake keep me from pulling farm-stock? Thanks in advance for any comments and suggestions, I swear someday I'll have a more interesting question for you.

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G-PULLER

02-26-2002 10:18:45

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Re: JD G Buildup in reply to G-MAN, 02-25-2002 17:41:42

G-man,
60 hp should not be a problem. My G is running
.090 M&W's, stock stroke, cyclone head thats shaved and ported, all-fuel manifold, stock cam pertronix ignition. With stock big-nut carb 58hp is not a problem on the dyno. I would suggest to send your big-nut to Roberts Carb Repair in Iowa to have him turn it into a Super 51. I ran one on my G last summer and it dynoed at 62hp.
I dynoed with and w/o air filter and with a large
K&N but did not make any more power. The way I look at it the closer to stock the tractor looks
on the outside the better, causes alot less arguments.

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Kerry Miller

02-26-2002 07:30:48

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Re: JD G Buildup in reply to G-MAN, 02-25-2002 17:41:42

Here's a question for you G guys (don't mind me and my little bitty ol JD 50...) If you build up a tractor like you're talking about, nothing too radical, could you still farm with it and have any reliability? I think it would be pretty funny to have an old G or something similar that I could hook to my father's 14 ft disk and outpull his 65 hp Long 2610... With the same power, the JD should have a LOT more torque.

Just curious. How much reliability could you expect out of something like that? If that's not feasable, what could you do and how much hp could you get and still have a reliable farm tractor?

Ok, I'll go back to weekend farming and watching you guys pull!

:-)
Kerry

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G Taylor .power/torque/rpm

02-27-2002 02:40:39

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Re: Re: JD G Buildup in reply to Kerry Miller, 02-26-2002 07:30:48

HP=torque in ft lbs x rpm divided by 5252. Torque vs HP is like comparing apples & oranges.

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JDGnut

02-26-2002 12:47:25

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Re: Re: JD G Buildup in reply to Kerry Miller, 02-26-2002 07:30:48

Kerry.. you have seen my G pull... Plowing it might get a little warm without the water pump but if you weren't pulling the guts out of it, it would have no problem.. Lots of tractor used to run in the field, with the exact engine I have in my tractor (except the head work) but they ran them on LP with no problem. (approx 115 Octane.)(the LP would give up some HP) The cost of the fuel would be the only problem, if you had the compression too high. But you could easily have a G with about 60hp and run it on good pump gas.. I would do a little work on the pistons to help prevent them from pre-igniting the fuel.. A set of High compression pistons, and just a little off the block or head, and you would be a happy camper.. Good stock puller, good in the field, no High $$$$ fuel and it would be dependable. Even with the Offset grind it would be durable, be compression would be getting a little high (depending on the pistons) (maybe a little booster for pulling) but compared to your 50, the G will the SUPER HOG on fuel.. just the nature of the beast.. JDGnut

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burns

02-26-2002 10:11:49

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Re: Re: JD G Buildup in reply to Kerry Miller, 02-26-2002 07:30:48

Other than a need for a good set of ear plugs, I will frequently take my G for a country ride for enjoyment and to sharpen the tires. (Some neighbors just shake their heads when there is almost 4000 pounds on the rear weight bracket and I am armed with an air tank adjusting the air presssure)

I use to work the G a little before I changed the drawbar design. 4th gear with a small two bottom drag plow will really roll the dirt over. HEHE

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Kerry

02-26-2002 13:48:26

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Re: Re: Re: JD G Buildup in reply to burns, 02-26-2002 10:11:49

Thanks for the info, I was just curious how durable/reliable the old antique pullers would be in the field. I don't need another hobby/project...

I'd still like to see what my father would say if I out-pulled his Long with an old JD. He never liked the 720 we had when I was a kid, he always hit his knee with the clutch lever! (I'm no spring chicken, he's 69.) He makes fun of my JD and says I should just get an 8n...

Keep pulling, I'll go back to lurking. Bryan, I'll see you in Corsicana, but I'm not going to bring the 50!

Kerry

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Kerry

02-26-2002 13:46:16

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Re: Re: Re: JD G Buildup in reply to burns, 02-26-2002 10:11:49

Thanks for the info, I was just curious how durable/reliable the old antique pullers would be in the field. I don't need another hobby/project...

Keep pulling, I'll go back to lurking. Bryan, I'll see you in Corsicana, but I'm not going to bring the 50!

Kerry

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burns

02-26-2002 05:39:24

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Re: JD G Buildup in reply to G-MAN, 02-25-2002 17:41:42

JDGnut is right on the money with the offset grind. I explored that option but decided it wasn't for me.

There are a couple guys who are running the cyclone head milled with other goodies that can hit the 55-60 hp range.

HP is certainly a nice feature but a good lugging tractor is just as important. A cam can really provide that extra edge. I have been very pleased with my Dengler cam but it is terribly expensive. I am sure you can find a comparable cam for less. I just liked how the cam worked in a local guys G. I had Renaissance tractor convert the air canister over to a paper filament and was extremely pleased. I have gone one step futher by having Steve Crum from Athens, Pa build a stainless intake system along with my existing 3" exhaust. Steve does incredible work. I am still tweaking the engine with the intake pipe but I can say the exhaust pipe was the best money I have spent. He has done a lot of testing of exhaust velocities and the 3" pipe really helps the performance. Be prepared for the grand stand mechanics to question the sound of the tractor thinking you have a stroker motor.

By the way I wouldn't under estimate an ol' G in the pulls. You have a good running Div 2 tractor. If you have any questions don't hesitate to drop me an email.

The link is to some pictures of my G. The finished tractor pictures are of when I still have the converted air canister but you can see the one picture of the new intake and exhaust pipes.

Link

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Karl

02-26-2002 11:25:28

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Re: Re: JD G Buildup in reply to burns, 02-26-2002 05:39:24

Where did you get that exhaust pipe made at.

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burns

02-26-2002 18:52:37

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Re: Re: Re: JD G Buildup in reply to Karl, 02-26-2002 11:25:28

Crum has built all of the pipes on my G. All of the pipes are welded, filed, and polished so the diameter is consistent from one end to the other. They are not pressed in a mandrel therefore they don't have any restrictions.

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JDGnut

02-25-2002 18:37:52

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Re: JD G Buildup in reply to G-MAN, 02-25-2002 17:41:42

G- this sounds like a good plan... It will be dependable.. I pulled mine like this for a long time, before installing the flathead, but I didn't mill the block or the head.. (just milled enough to clean up the surfaces) You will be close to you goal, depending on how much you mill off the block and the head... but keep in mind the idea of the offset grind, especially if you pull the crank, and have it at the machine shop.. (ask them how much they would charge to offset grid it to the 3.00 Rod Journals)(I also think U mentioned have to buy or get insert rods anyways.) The A rods are the same length and have the same piston pin diameter, but have the 3in rod Journal. On the cam, that is up to you, but I would at least get the stock one reground, I have had good luck with the stock grind, (especially for a small engine) but others like the aftermarkeret cams. (each to their own) On the Carb, I would find someone.. (anyone) other than Denny's for the carb.. Motec or Robert's.. Make sure U upgrade the ignition too.. Ele-pickup, with a good coil.. and I like the spark plug adapters with the smaller plugs.. (cheap too.) You can also look into 3in exhaust.. I had an exhaust make one for me out of Aluminized pipe.. (about $20)(you will have to grind out the hole so the 3 in pipe will fit up to where the muffler would be.) Won't worry about the intake.. most places let the aftermarket manifolds pull in the stock class.
G-.. what size tires are you planning on running.. and what weight classes???? Good luck..
JDGnut

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G-MAN

02-25-2002 20:42:31

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Re: Re: JD G Buildup in reply to JDGnut, 02-25-2002 18:37:52

Thanks JDGnut. I appreciate the info. I haven't given a lot of thought to tires yet, that's still a ways off - plan on taking it down to the bare main case and going through everything. It has 15.5 - 38s on it now and i kind of like the way they look, although they're shot. As for weight, I'm a pretty good-sized guy and I want to leave the power-trol on it, so I doubt if i can get it very light. I would be interested in putting stamped wheels on it if i could find hubs reasonably priced. I'll probably put a little smaller than stock front tires on it also to give it a meaner stance LOL. The A rod idea sounds good, I didn't realize they were the same length and pin diameter. I'll probably go that route as long as durability doesn't suffer - and it looks like there is plenty of meat in that crank! Anyway, thanks again and i look forward to hearing from anybody else who wants to throw their 2 cents in. I'll listen to any ideas you guys may have.

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Mike

02-26-2002 10:10:28

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Re: Re: Re: JD G Buildup in reply to G-MAN, 02-25-2002 20:42:31

my G doesn't run as good as I'd like it to but w/ G's BIGGER tires are BETTER. I am hoping to run 3rd gear low range this summer in 5500. I run 20.8 34's and am cometitive in 6500.

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kcoston

02-26-2002 09:52:29

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Re: Re: Re: JD G Buildup in reply to G-MAN, 02-25-2002 20:42:31

If you decide to put stamped steel wheels on the G, a friend of mine in Atkinsson, NE makes wheel adaptors that mate your existing hubs to the steel wheels. They work great for only $100. His name and number is Don Holtgrew (pulls DIEHARD 2 in NATPA) 402 925 5705.

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G Taylor

02-26-2002 05:00:52

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Re: Re: Re: JD G Buildup in reply to G-MAN, 02-25-2002 20:42:31

As long as she has enough power to spin out in 1st gear, the $ for extra HP is a luxury. To win requires traction.Find out in writing what the largest legal tire size in your class(s) and is cut tires allowed. Have a tire cutting shop grind or find a set then go out & pull to the end of the track. The competition will be spinning out in 2nd gear at mid track. Sounds like you will be pulling in the 6500lb and up class.

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