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Tractor Pulling Discussion Forum

cranks

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Chuckstr

08-20-2004 19:00:53




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IM looking into adding 1/4 to 1/2 inch stroke to a stock crank. what would be the best way to do this.Ive been considering stroking or off set grinding. I want a reliable engine when this is all said and done. Thanks for any help




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gunslinger

08-21-2004 13:55:29




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 Re: cranks in reply to Chuckstr, 08-20-2004 19:00:53  
Call me at my shop ,we can talk about your engine.My number is (419)946-6167.I will be gone on monday the 23rd,for my wedding anniversary,but I will be back on tuesday.Hope to talk to you,Mark.



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JDGnut

08-21-2004 08:55:43




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 Re: cranks in reply to Chuckstr, 08-20-2004 19:00:53  
Chuck... If you are going to have a crank welded.. Look at the cost of a small stroker compared to a bigger crank... Usually prices are the same.. or close to the same.. The difference is if you can use existing parts... (pistons and rods...) if you are buying new parts this is not a problem... The offset grinds are little tricks that work if you can find the correct rod.. (Ex JD A taking a 3in journal down to a 2.75, will add .250 stroke and push the piston up .125 more.. (also increasing compression) and .125 furuther down... If you are trying to use a stock piston.. and it has a ring below the piston pin.. make sure it does not come out the bottem of the sleeve...) What color is your tractor.. maybe someone could point you in a better direction...

Good Luck..
JDGnut

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Chuckstr

08-21-2004 21:15:31




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 Re: cranks in reply to JDGnut, 08-21-2004 08:55:43  
sorry its an allis wd45 crank



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CASEPOWER

08-20-2004 20:21:34




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 Re: cranks in reply to Chuckstr, 08-20-2004 19:00:53  
You can offset grind if your crank is meaty enough and you can find rods to match. If you stroke 1/4" your only talking about grinding 1/8" from the crank, which is .125". If you want to use your current journal size, you will need to weld it, then offset grind it. What engine are you working with??



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wrong

08-20-2004 22:24:18




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 Re: cranks in reply to CASEPOWER, 08-20-2004 20:21:34  
If you stroke 1/4 you offset grind 1/4 not 1/8 the centerline of the journal mooves half of what you grind and 2 times that moovement is the stroke gain



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CASEPOWER

08-21-2004 06:13:06




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 Re: cranks in reply to wrong, 08-20-2004 22:24:18  
You need to re-read my post. If you want 1/4 more stroke, your only adding "half" 1/8" to the crankshaft to get it. On full rotation it will give you 1/4" stroke.



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A.P.

08-21-2004 10:20:21




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 Re: cranks in reply to CASEPOWER, 08-21-2004 06:13:06  
If you are welding up the rod journal and keeping the original journal diameter you are correct. If you are just grinding a smaller journal from the existing material you would be incorrect.

If you have a 4" stroke engine with a 2 1/4" diameter journal, the center of the crank pin will be 2" (4/2=2) from the centerline of the crank. If you offset grind (towards the outside) the crank and reduce the journal to 2" it will move the center of the crankpin out only 1/8". Look at it this way, the outside surface of the crankpin does not move out when it is offset ground. The center of the crankpin for a 2 1/4" crank pin is 1 1/8" in from this surface. For the new crankpin diameter it is 1". So 1 1/8"-1"=1/8". The center of the journal has moved out 1/8" from the crank center line. 2x1/8"=1/4"ich would be the incease in stroke.

A.P.

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CASEPOWER

08-21-2004 11:09:54




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 Re: cranks in reply to A.P., 08-21-2004 10:20:21  
The point I am having so much problem explaining is, if you move the center point of the rod journal out .125" (no matter the way you do it) from the center point of the crank you gain .250" of stroke on the full rotation.



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JDGNut

08-21-2004 12:10:37




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 Re: cranks in reply to CASEPOWER, 08-21-2004 11:09:54  
Casepower... I think it is just the way you are explaining it... You are correct.. moving the center line of the crank .125 will add .250 of stroke... but you have to grind off .250 off the inside of the journal to move the centerline .125... All in all... it all means the same... JDGnut



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A.P.

08-21-2004 14:38:20




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 Re: cranks in reply to JDGNut, 08-21-2004 12:10:37  
I wasn't implying that Casepower did not understand what he saying, just that others might have gotten the wrong idea by how it was worded. I have had the argument before with people who truly believed that by grinding say 1/4" off of the inside of the journal that they were stroking the engine 1/2" without adding material to the outside of the throw. It does make for some wildly inflated stroke & cubic inch claims for an engine and usually pretty dissapointing power levels.

Happy Hooking!

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Chuckstr

08-21-2004 21:47:57




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 Re: cranks in reply to A.P., 08-21-2004 14:38:20  
Thanks for the help.Here is what I whant to do I dont want to ruin the integerty and the longgevety of the crank. Ive been told and shown that when you weld on it the crank becomes brittle.Even if I only need 1/2" You know the old addege.( more power) and thanks again for your coments.



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JDGnut

08-21-2004 22:48:49




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 Re: cranks in reply to Chuckstr, 08-21-2004 21:47:57  
AP.. I got ya... I understand what said and that you did too... I don't know why that is hard for others to understand sometimes...

Chuck.. there are different process out there that you can use if you are worried aboutthe cranks if it is welded... One that a few friends have used is cryo process.. they heat and cool the crank to help remove stress on the crank.. NASCAR uses it on a bunch of ther engine parts.. There are 1000's of welded cranks running out there without any problems.. 1/2 is not much of a stroke to add and it wir retain most of the orginal journal... All I can say is that if you are going to spend the time and money to have a crank built might as well build one with some size to it... JDGnut

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Chuckstr

08-22-2004 06:24:05




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 Re: cranks in reply to JDGnut, 08-21-2004 22:48:49  
I have been thinking about going up to 5" because then I wouldnt have to grind much off the block. Then someone brought the idea to me abought offset grinding so thanks again.



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