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JD G connecting rods

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G-MAN

02-22-2002 10:27:54




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i'm building/restoring a 1948 g and am interested in useing lengthened rods to increase the comp. ratio. i am wondering about the durability of these types of modifications, will they hold up long term, or is this something to be done for pulling only? also looking info on shops that can perform this. i want the tractor to pull good on the track, but i'd like to be able to plow with it and not worry about a rod breaking. any help would be greatly appreciated.

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Mike in Mo

02-23-2002 11:32:45




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 Re: JD G connecting rods in reply to G-MAN, 02-22-2002 10:27:54  
G-MAN Another possibility is having your crank offset ground down to a 3.000" crankpin (7.375 stroke) and use an "A" or "60" rod. This would move the piston up 3/16" besides giving you about 22 cubes. Probably cost around $3-400, But having rods made would cost anywhere from 100-200. The rods can be pieced/welded and preserve the oil passage by putting a carbon rod in the passage when welding then driving it out when done(so I've been told). Good luck Mike

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fifthgeardeere

02-23-2002 12:56:30




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 Re: Re: JD G connecting rods in reply to Mike in Mo, 02-23-2002 11:32:45  
MIKE IN MO'S METHOD IS MONEY WELL SPENT. JD 4010 ROD WORKS GOOD TOO. MERFELD MACHINE DOES GOOD JOB PUTTING RODS TOGETHER.



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Gman

02-23-2002 07:58:45




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 Re: JD G connecting rods in reply to G-MAN, 02-22-2002 10:27:54  
Hi G-man it hard to have a work tractor and a play pretty all I the same time.When you cut the rods you lose the oil galley to the wrist pens so you will have drill them on top so they will be splash lubricated.You could order a set of one piece rods from Cunningham designed off the 4020 rod and use the F-485 block which is one inch longer than the F-551 block.Stroke the crank to 8 1/2 " you will have to figure out the rod lenght. I would be careful and not get to much compression,because it takes a lot of energy to compress the gases and you aren't going to turn a lot of rpms.The cunningham rods don't have the oil passage in them either,so working a tractor with this type of rod could be questionable. Have fun if I can be of assistance email. Gman

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G Taylor F- 485 F-551 cylinder blocks

02-23-2002 15:36:18




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 Re: Re: JD G connecting rods in reply to Gman, 02-23-2002 07:58:45  
Besides length what other differences/applications did the two "G" blocks have?



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lynn

02-22-2002 17:35:16




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 Re: JD G connecting rods in reply to G-MAN, 02-22-2002 10:27:54  
have used serveral cut rods in a b g trators for pulling and never had a problem..you can use an a rod for the wrist pin end..cheaper and easier to find..lynn



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G PULLER

02-22-2002 16:44:04




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 Re: JD G connecting rods in reply to G-MAN, 02-22-2002 10:27:54  
G-Man I don't know were you are located at but cornett machine shop at somerset ky can do what you want but you will need 2 sets of rods so you will only have one weld. I would deck the head & block & put in a set of M&W alum high top pistons instead will give you 12 to 15 more hp.



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G-MAN

02-23-2002 13:20:29




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 Re: Re: JD G connecting rods in reply to G PULLER, 02-22-2002 16:44:04  
thanks a bunch for all your input. i'v been thinking it over and i really don't have the time, money or inclination to build a mega-cube monster, so i think i'll probably go G-PULLER's route. i don't want to butcher this tractor as i'v wanted one for a long time and got this one complete for only $650. how much should i take off the head and block, and will this affect the fit of the other parts? i am a full time deere tech learning to work on tractors twice my age, but i'm pretty good on newer stuff, so if i can help anybody with technical or parts info on 20 series through 8020 series, please e-mail me. i'll be glad to help.

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surber@centurytel.net

02-24-2002 17:22:50




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 Re: Re: Re: JD G connecting rods in reply to G-MAN, 02-23-2002 13:20:29  
G-MAN just take off enough to make sure that both head and block are true.



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JDGnut

02-23-2002 16:05:58




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 Re: Re: Re: JD G connecting rods in reply to G-MAN, 02-23-2002 13:20:29  
You mentioned plowing with your tractor.. All of the mods U have listed will increase the compression ratio.. In result you will have to run high Octane fuel... about $5 per gallon.. Just letting you know before... When you get the compression up, you will have a nice, dependable puller.. I have one with the high compression pistons with a flathead.. Cheap power.. and a fun tractor to pull, and its dependable.. Drop me a line sometime.. talk pullers.. or 8020's common rail Denso injection systems.. haha.. Good Luck.. JDGnut

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