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Tractor Pulling Discussion Forum

can i stroke 1941 b

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walt j d b

03-24-2005 16:25:19

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i like to know if i can stroke my 1941 John deere b can i go to 6" ? i would like to make this tractor in a puller for my i6 yr old. any help would be good thanks walt

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B PULLIN

03-26-2005 14:43:01

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Re: can i stroke 1941 b in reply to walt j d b, 03-24-2005 16:25:19

YOU WILL HAVE TO GRIND TOP OF CASE BY ENGINE COVER, YOU WILL ALSO HAVE TO GRIND SECTION OF CASE WHERE RODS PASS BY REAR OF CASE (WALL BETWEEN TRANSMISSION AND ENGINE CASE). A LOT OF TIMES IT IS EASIER TO JUST CUT SQUARE HOLES IN REAR WALL AND BOLT IN PANS FOR CLEARANCE. 7.25 INCH IS NOT REALLY ANY HARDER THAN 7 INCH TO MAKE FIT. THE CAM IS VERY DIFFICULT, GET PROFESSIONAL TO DO IT SCHOOLER MOTORSPORTS WILL HOOK YOU UP.

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walt jd b

03-28-2005 07:05:18

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schooler in reply to B PULLIN, 03-26-2005 14:43:01

do you have # for schooler i need all the help i can get.....

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buickanddeere

03-25-2005 13:07:57

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Re: can i stroke 1941 b in reply to walt j d b, 03-24-2005 16:25:19

What bore size are you running and how deep are your pockets?

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walt jd b

03-25-2005 18:54:06

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bore size in reply to buickanddeere, 03-25-2005 13:07:57

i was going to get after market 125 thousant over it will be 4 11/16" ????? ????? ????

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a puller

03-25-2005 19:11:21

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Re: bore size/cam in reply to walt jd b, 03-25-2005 18:54:06

your block stock is 4.5"....add .125 to it and you get 4.625....4 5/8 bore. on the cam, you have to either turn it down on a lathe where the rods/crank journals go around, or flat spot it (time consuming but stronger/more durable). its all so the rods will miss, the cam is the hold back on 2 cyl. stroke..lol..we have an A with a 7.25" crank..not ALOT of work..but still ahd to flat spot the cam and grind on teh back plate..and the top

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JPatton

03-24-2005 17:37:07

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Re: can i stroke 1941 b in reply to walt j d b, 03-24-2005 16:25:19

Walt - You can go 7.5" but you have to want that crank in there awfull bad. 7" is much easier and if done right, will be trouble free and easy to drive and maintain.

Jerry

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walt jd b

03-25-2005 05:55:12

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if 7 will i have clearance? in reply to JPatton, 03-24-2005 17:37:07

thanks for the reply. if i stroke to 7" will i have to grind anyting or will there be clearance for the rods to turn? thanks walt.

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JPatton

03-25-2005 06:59:21

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Re: if 7 will i have clearance? in reply to walt jd b, 03-25-2005 05:55:12

Walt - You will have to turn the cam down to clear the rods for sure. Some grinding on the back of the case and top where the access cover is. I haven"t done one yet but have my eye on a "41 if the present owner and I can get together on the price.

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walt jd b

03-25-2005 18:57:14

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cam down ? in reply to JPatton, 03-25-2005 06:59:21

what do you mean to turn the cam down??

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JPatton

03-25-2005 21:22:07

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Re: cam down ? in reply to walt jd b, 03-25-2005 18:57:14

Walt - The cam is too large in diameter to allow the longer throws on the crank to clear. On A & G tractors it is common to grind flat spots on the cam between the lobes to clear the rods. The problem with the B cam is that it is hollow to allow the oil to flow to the bearings. If you grind or turn too much off of the cam, it will be history. We turned one down with no problem. We used what ever the dimeter is for the bearing on the end. I think it was .750".

Jerry

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Drew

03-25-2005 21:39:57

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Re: cam down ? in reply to JPatton, 03-25-2005 21:22:07

I heard a guy once used a 50 cam because it was solid. Then you can flatspot it w/o problems.

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JerryBird

03-26-2005 16:26:35

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Re: cam down ? in reply to Drew, 03-25-2005 21:39:57

A "50" cam is hallow ,just like the"B".

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walt jd b

03-25-2005 05:49:50

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Re: can i stroke 1941 b in reply to JPatton, 03-24-2005 17:37:07

thanks for the reply. if i stroke to 7" will i have to grind anyting or will there be clearance for the rods to turn? thanks walt.

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walt jd b

03-27-2005 17:11:35

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b rods???? in reply to walt jd b, 03-25-2005 05:49:50

thanks for all the help with this b how about the rods? i took off the crank cover this weekend and the rod cap bolts look like there very close to the top do i need new ones? and when i stoke it do i have to do anything with the cly pet cocks holes becuse now the piston rings will go past them or not ??? thanks agan for all the info !!!!

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jd b puller

03-27-2005 18:40:42

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Re: b rods???? in reply to walt jd b, 03-27-2005 17:11:35

Walt: Forget about those B rods. Your gonna end up using something else and a smaller journal than stock. As long as the checkbook allows, if you are going to stroke it, try to find a powerblock or look at having yours sleeved. I think WTW might have an extra powerblock.

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walt jd b

03-28-2005 06:57:00

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b?????????? in reply to jd b puller, 03-27-2005 18:40:42

who is wtw do u have # how do know what rods .

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jd b puller

03-29-2005 19:06:33

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Re: b?????????? in reply to walt jd b, 03-28-2005 06:57:00

WTW (Dave) is very knowledgable about the B"s. Post something on the JD site asking for him. He can probably help you out.

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walt jd b

03-31-2005 05:18:56

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Re: b?????????? jd in reply to jd b puller, 03-29-2005 19:06:33

thanks jd do you have his #

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walt jd b

03-27-2005 17:05:16

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b rods???? in reply to walt jd b, 03-25-2005 05:49:50

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Green Weenie

03-24-2005 16:55:02

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Re: can i stroke 1941 b in reply to walt j d b, 03-24-2005 16:25:19

Sure, but if your going to whip a bear, whip a Grizzley, go 7.5"

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jd b puller

03-29-2005 19:08:33

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Re: can i stroke 1941 b in reply to Green Weenie, 03-24-2005 16:55:02

Weenie: Don't take this the wrong way, what tractor do you pull with? Which class? Aren't you somewhere out in the Midwest?

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Simple Awnser

03-27-2005 04:55:57

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Re: can i stroke 1941 b in reply to Green Weenie, 03-24-2005 16:55:02

Or you can get an A and save a lot of time and money!!!!

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Pullin A

03-27-2005 09:21:04

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Re: can i stroke 1941 b in reply to Simple Awnser, 03-27-2005 04:55:57

can you go 8 inches? I know a guy that is going to try but was wondering if it has ever been done? If not it will be soon!! 6.5inch bore too.

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jd b puller

03-27-2005 18:35:26

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Re: can i stroke 1941 b in reply to Pullin A, 03-27-2005 09:21:04

You can do whatever your wallet can afford. Would venture to say that people going to 8 will have a short life expectancy. I have talked with a couple guys that went 8+ but I'd give them a year or less. Kinda depends what you want for journal size - the bigger the journal, the better the chance of it holding together, but the harder it is to clear. The smaller they are, the bigger you can fit, but the more likely it is to break. The guys that I know of when with really small journala... I would rather have a big crank with some girth than a really big crank and itty bitty journals.

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walt jd b

03-31-2005 05:54:52

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Re: can i stroke 1941 b in reply to jd b puller, 03-27-2005 18:35:26

jd do you think if i only go 6 1/2 stroke it make a change in power? i dont want to go to big the frist time so i dont have to work on it after ever pull. do you have a # of some one that can help with the rods?

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jd b puller

03-31-2005 15:38:46

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Re: can i stroke 1941 b in reply to walt jd b , 03-31-2005 05:54:52

Walt, I think it wold be foolish to go 6.5". It is going to cost you the same up to about 7 or 7.5 - I would suggest Kieth Merfeld - Tell him you want to go 7.25" with the Oliver Rods. You can go bigger, but if you are trying to minimize work, work, this will really help. You MIGHT be able to just grind on the back case without going thru. At 7" I am almost certain you could get away with it. Just remember, like the Weenie said, "if you are going to whip a bear, whip a Grizzly". 7.5 will fit and should be reliable, just makes for a lot of grinding.

My e-mail is open

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walt jd b

03-31-2005 17:49:49

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Re: can i stroke 1941 b in reply to jd b puller, 03-31-2005 15:38:46

jd do you have kieth merfeld # when you say oliver rod you mean out of an oliver tractor????? ?

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jd b puller

03-31-2005 21:39:32

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Re: can i stroke 1941 b in reply to walt jd b, 03-31-2005 17:49:49

Yep, out of an Oliver tractor. Kieth's number is 563-582-8710. Best time to reach him is probably 4-6 Central time.

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walt jd b

04-03-2005 18:42:12

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Re: can i stroke 1941 b in reply to jd b puller, 03-31-2005 21:39:32

jd b puller i didnt call kieth yet but this week ill call him hope he can help

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walt jd b

04-01-2005 04:57:56

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Re: can i stroke 1941 b in reply to jd b puller, 03-31-2005 21:39:32

thanks jd will see what happens i hope i can get it done soon!!! ya right..... ..... .

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B PULLIN

04-01-2005 18:18:37

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Re: can i stroke 1941 b in reply to walt jd b, 04-01-2005 04:57:56

SCHOOLERS PHONE NUMBER 1-666-748-4475. HE MAY BE VERY BUSY RIGHT NOW BUT DON"T GIVE UP HE WILL BE A BIG HELP. IF YOU STROKE YOUR B TO 7 OR 7.25 YOU CAN MANAGE THIS, IT IS NOT TOO HARD. IT WILL TAKE TIME THOUGH. DON"T BE IN A HURRY DO IT RIGHT THE FIRST TIME. IF YOU FIND A BLOCK FOR A 48 OR NEWER B YOU CAND BORE IT LARGER THAN THE EARLY BLOCK AND SCHOOLER HAS NICE SHORT PISTONS TO FIT. THE RODS ARE ACTUALLY WELDED, FARMALL H AT THE CRANK END AND JDB ON THE PISTON END. YOU MAY NEED TO FIND A HEISLER HEAD IF YOU WANT TO RAISE THE COMPRESSION. ONE LAST THING SCHOOLER WILL TELL YOU GUYS ARE BUILDING 7.5 TO 7.75 STROKER B"S OR EVEN LARGER NOW. DON"T WAST YOUR TIME WITH THAT MUCH STROKE BECAUSE THE CRANKS BREAK. PULLING IS GREAT FUN ONLY IF YOU CAN TAKE YOUR TRACTOR HOME IN ONE PIECE.

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walt jd b

04-03-2005 18:31:19

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Re: can i stroke 1941 b in reply to B PULLIN, 04-01-2005 18:18:37

thanks B PULLIN for the info yes i dont want to go to big do you think i should go smaller then 7" if i went 6 3/4" would i still have to grind the cam? and mabe it would stay together better. Where we pull i dont think i need super powers..... ..... ..... .....

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jd b puller

04-01-2005 19:02:06

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Re: can i stroke 1941 b in reply to B PULLIN, 04-01-2005 18:18:37

Never used Schooler - left him messages 3 or 4 times and he never called me back. Not sure what he really does - don"t think he does cranks or machine work.

There are a lot better rods to use than Farmall H rods, as explained above.

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B PULLIN

04-03-2005 10:51:11

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Re: can i stroke 1941 b in reply to jd b puller, 04-01-2005 19:02:06

THE OLIVER RODS MUST BE NEWER THAN THE 77 AND 88 TRACTORS, I BELIEVE THEY WERE SPLASH LUBED. THE FARMALL H RODS ARE PRESSURE LUBED. SCHOOLER HAS YOUR CRANK STROKED OUTSIDE HIS SHOP BUT HE KNOWS WHAT NEEDS TO BE DONE WHEN YOU TELL HIM WHAT TRACTOR AND WHAT PARTS YOU WANT TO USE. HE DOES EXCELLENT CARB WORK AND HE ALSO GRINDS CAMS SO THEY CLEAR THE RODS. THE ONLY PROBLEM IS THAT HE IS BUSY AND IF YOU ARE STARTING A BIG PROJECT IT IS BETTER TO START IN THE FALL WHEN YOU HAVE TIME THAN NOW WHEN IT IS TO LATE TO BE READY IN TIME TO PULL.

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jd b puller

04-04-2005 18:26:22

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Re: can i stroke 1941 b in reply to B PULLIN, 04-03-2005 10:51:11

Many guys don't run pressure lube. When you weld 2 rods together to make one, sometimes you lose the passage. Also, these things aren't doing any more plowing, so splash lube seems to hold up.

B Pullin and/or Walt
Send me your e-mail or phone and I can call you.

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walt jd b

04-09-2005 06:59:36

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Re: can i stroke 1941 b in reply to jd b puller, 04-04-2005 18:26:22

hi jd sorry for the delay getting back if you have time give me a call leave your # an ill call you back so you dont spend your $ thanks walt

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jd b puller

04-09-2005 07:29:34

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Re: can i stroke 1941 b in reply to walt jd b, 04-09-2005 06:59:36

Hey Walt, you didn"t leave your phone number. Give me a call at 919-605-6040.

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walt jd b

04-12-2005 18:30:22

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Re: can i stroke 1941 b in reply to jd b puller, 04-09-2005 07:29:34

JD i dont have your right home # to call you at 9:15 i call your cell. thanks walt

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