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Tractor Pulling Discussion Forum

Advice Needed from JD pullers

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Crankshaft20

09-07-2005 06:20:17

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Hello all, First I must say that this site is one of the most useful tools that any tractor owner should be using; getting advice from experience is PRICELESS. Anyways with that said I need assistance with a new project I'm starting on. My dad, brother and I have decided to make our 1955 JD 70 into a competitive pulling tractor. One of the options we were considering was to replace the stock crank with a stroker. What are some of the advantages or problems that a first time builder needs to know before starting this adventure? Will I need to change my stock connecting rods or pistons for proper clearance with this new crankshaft? Who are the best people to contact bout getting one? Also is anyone aware of a differential lock used in the two cylinder John Deere�s. Feel free to email or call anytime, Thanks in Advance for all your help, Dan (724-984-2631)

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potentpuller

09-09-2005 19:38:57

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Re: Advice Needed from JD pullers in reply to Crankshaft20, 09-07-2005 06:20:17

Just an idea, but has anyone put deisel pistons in a Gas 70? If they're the same bore that would give you some serious compression. Course then you have to buy that $4.85/gallon Cam2!

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JDBert

09-10-2005 20:19:16

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Re: Advice Needed from JD pullers in reply to potentpuller, 09-09-2005 19:38:57

You can do diesel pistons in a gas. It would take some machine work and a littly fitting but you could make it work. You would have to bore the block out bushing down the wrist pin holes in the pistons down to the smaller size of the 70 gas rod and then you'd have to figure out what compression you wanted and do some milling off the tops of the pistons. BUT IT CAN BE DONE

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buickanddeere

09-09-2005 22:07:58

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Re: Advice Needed from JD pullers in reply to potentpuller, 09-09-2005 19:38:57

Where does this 70 diesel pistons in a 70 gas come from? Not even close. Just find or get a set of LP pistons made. Some careful and lucky people have bored the 5-7/8 block to 6-1/8 without hitting water.

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G/MAN

09-07-2005 13:40:21

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Re: Advice Needed from JD pullers in reply to Crankshaft20, 09-07-2005 06:20:17

Is your "70" an all-fuel tractor or gasoline/LP? All-fuels have the same cubes as the "G" - 412.5. Gas-burners and LPs have a smaller engine.

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Crankshaft20

09-08-2005 05:09:01

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Re: Advice Needed from JD pullers in reply to G/MAN, 09-07-2005 13:40:21

Mine is a gas/LP, So it is a bit smaller than the all fuel. Will a Flat head for a G fit on that block?
thanks

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G/MAN

09-08-2005 07:34:22

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Re: Advice Needed from JD pullers in reply to Crankshaft20, 09-08-2005 05:09:01

I'd have to look at the gasket part numbers for sure, but it might. I don't know why someone would want to use one though, since you're giving up the "swirl" effect of the cyclone cylinder head that's already on there, and the tuning benefits of the two-barrel induction system. There's more ways to make compression than flat heads.

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Drew

09-08-2005 10:13:11

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Re: Advice Needed from JD pullers in reply to G/MAN, 09-08-2005 07:34:22

You mean giving up the "swirl" effect, you are giving up shrouding half the intake valve, so with a flat head air can flow around the whole valve and not just the exposed half of it.

I do agree though that you definately want the two barrel. You get better velocity thru two smaller venturis than one big one.

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G/MAN

09-09-2005 07:38:34

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Re: Advice Needed from JD pullers in reply to Drew, 09-08-2005 10:13:11

Shrouding the intake valve serves a purpose in a two-cylinder Deere, and a good one. With those big bores and large cylinder volumes, as the intake charge comes in and reacts off the "eyebrow", it swirls the mixture and helps keep the fuel in suspension, resulting in a better burn and more power. I'm pretty sure the Deere engineers knew what they were doing when they made the change from flat heads to cyclone heads.

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buickanddeere

09-09-2005 00:33:10

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Re: Advice Needed from JD pullers in reply to Drew, 09-08-2005 10:13:11

The G and all fuel 70 heads are the only ones that mix and match. The gasser/LP 70 have a different bolt pattern and length block. The 70 gasser is a serious puller even with the 5-7/8 bore. Sometimes a power-block can be found. They are a 7-2 if memory serves? The 70 build-up I previously posted will out power all but the best built G's. Reliable to the point of boring too.

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NEWGEN 4010

09-07-2005 12:17:14

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Re: Advice Needed from JD pullers in reply to Crankshaft20, 09-07-2005 06:20:17

First of all I love those 2 cyl. Deere's. Second, find out what year tractor you can use. Alot of places including here are letting in the 1960's tractors. If your going big, ie stroke, bore, head work etc. You'd better have DEEP pockets and be willing to do alot of work, and from what I've seen they do not last. You'll here others chime in here and say "They were'nt built right if they didn't last", But, I've seen them built right and not last more than 3 seasons. I'd rather have 7-8k in 6 cyl. than 12k in 2. If you just want a little bump in HP and run stock classes you should be fine. My 2 cents.

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G/MAN

09-10-2005 10:09:41

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Re: Advice Needed from JD pullers in reply to NEWGEN 4010, 09-07-2005 12:17:14

"Stock classes"? If you think two-bangers are only good for stock classes, I can show you plenty of evidence to the contrary. Granted, you don't see Division V two-bangers, but there are plenty of dominant Deeres in Div III. From what I've observed, guys that just want to spend money and win trophies buy and/or build Olivers, Farmalls, and the like. Deere pullers pull Deeres because they love the tractors. If you don't want to go 12 mph, you can go find yourself a creeper-gear two-banger, do your homework, pull in heavier classes where you can effectively stick the tractor in low gear and win. And there's all kinds of NON-creeper Deeres that win, too. As for "building them right", a good friend of mine has a 700-cube "GM" that's stayed together for a bunch of seasons. I don't know how many for sure, but at least 5. They freshened it last year and stuck it back together. And that tractor probably sees 30 hooks a year.

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NEWGEN 4010

09-10-2005 22:34:27

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Re: Advice Needed from JD pullers in reply to G/MAN, 09-10-2005 10:09:41

Where I pull there is no 1-5 Divisions, there's either 3.5 stock, which nobody is stock, or there's open, or classic. There are 3 G's, and 4 A's that pull around here, one has a broken crank, one has been just put back together, 2 A's are bow legged from pulling 10,000lb open classes and one G isn't used any more, why? cause he doesn't want to spend any more $ than he already has to make it competitive. I don't know where you pull and don't care, but around here, you better have horsepower and be able to stick it on the ground!

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super mta v8 puller

09-09-2005 14:55:02

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Re: Advice Needed from JD pullers in reply to NEWGEN 4010, 09-07-2005 12:17:14

coud not have said that any better

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buickanddeere

09-07-2005 09:19:52

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Re: Advice Needed from JD pullers in reply to Crankshaft20, 09-07-2005 06:20:17

Before you get too deep into the $$$. You will be pleasantly supprised how well a well a cheap tuned factory stock 70 will do. The 1st three things to get ironed out 1st are traction, traction and traction. A hard bitting set of tires, max legal drawbar height, perfect fore/aft ballance, ideal tire pressure and max legal weight. These will get you into the top 5% of the class even if the others have twice the HP. If getting over 6500lbs on a sticky clay power track. Then a set of LP pistons, a cam from Robert's carb, a dry aircleaner conversion, LP manifolds, three angle valve job, valve bowl blending and port matching. Then a dyno tuning session. These will get you into the 8000 and 10,000lb classes. Reliable and not months of work and buckets of cash.

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Tyler Neff

09-07-2005 06:48:30

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Re: Advice Needed from JD pullers in reply to Crankshaft20, 09-07-2005 06:20:17

Dan, How big are you wanting to go with it, or how much horsepower do you want? All this will determine how much work you will have to put into . If your gonna go up an inch or so you shouldnt have to many problems with stroke. If you go big (9.25-9.75) get to know your body grinder it will be your best friend for a while. Give me a call for more details (937)372-5438.

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