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Tractor Pulling Discussion Forum

stroking a 1937 john deere A

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jimbo

07-09-2004 18:56:58




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Would like some help from the green pullers on stroking a john deere A. What do I do with the oil canister, the crank almost hits it now. Also if I run a 6.5" piston what would a good stroke be
for the engine.




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Drew

07-10-2004 07:26:22




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 Re: stroking a 1937 john deere A in reply to jimbo, 07-09-2004 18:56:58  
9.250" is easy, 9.500" will go. You will have to cut slots in the back wall of the crankcase to swing it. The cam will also have to FLAT SPOTTED, not ground round to about .625"-.700" thick depending on stroke and how much you take off the top side of the connecting rod.



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?!?

07-10-2004 14:15:28




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 Re: Re: stroking a 1937 john deere A in reply to Drew, 07-10-2004 07:26:22  
how the heck do you get a 9.5" crank to clear? can i get some details???i'm impressed



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Drew

07-10-2004 18:19:38




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 Re: Re: Re: stroking a 1937 john deere A in reply to ?!?, 07-10-2004 14:15:28  
First off, this is using a 2.750 crankpin and a 329 diesel big end. Slots have to be cut out of the back wall of the crankcase for the rod to go thru. Then this requires pans to be put into these slots to keep the engine oil seperate from the transmission oil, or using motor oil in the transmission. The rod will come completely thru the top of the crankcase on the flywheel side and barely thru on the clutch side. A small piece can be made to cover the hole on the flywheel side and fit between the top cover and the governor housing. The cam has to be flat spotted down to .625"-.700", depending on how much you grind off the top part of the rod, which can be cut to .250" thick (housing bore to outside, not counting bearing thickness) where it goes by the cam. A piston with a short compression height needs to be used so a longer rod can be used to keep the wrist pin inside the bore. The oil lines for the main bearings have to be routed out of the way, but the oil pump itself isnt in the way. All this is considering a stock camshaft location, more stroke can be added if the cam is moved foward.

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holy cow...

07-11-2004 10:22:47




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 Re: Re: Re: Re: stroking a 1937 john deere A in reply to Drew, 07-10-2004 18:19:38  
that sounds interesting...lol...how much horse do they have? ours with 6.125x7.25 and a 60 head has about 60....i think we could get more..but i don't know our problem.. how much would these large machines have? have considered a G instead for a big stroke like 8 or 9 "..but maybe more if an A can be 9.5!!..lol...thanks alot for the info..



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Drew

07-11-2004 19:56:34




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 Re: Re: Re: Re: Re: stroking a 1937 john deere A in reply to holy cow..., 07-11-2004 10:22:47  
100+hp is possible if the with a Heisler head or a Jerry's head that is fixed to flow right. The 60 head shrouds the intake valve real bad, and in stock form, only feeds one bbl per cyl, not both barrels for each cylinder. The more air you can get into the thing, the better. I have heard of 11" cranks in G's, and have seen PART of one. I would not expect one that big to live real long. You could probably run the 9.500" in an A for 6-7 years and it still be in one piece, though I would have it magged when it got up that old to make sure its not starting to crack.

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8 is a big a

07-09-2004 22:54:01




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 Re: stroking a 1937 john deere A in reply to jimbo, 07-09-2004 18:56:58  
we have one 7.25..early styled..have considered 8"..but would wrather do a G.



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