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JD pulls

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dake K (Fl)

02-25-2001 17:34:52




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Went to a tractor pull this weekend and the poppers gave everybody a run for the money. They really get down and lug, as well I know as I have, and use, a model A. I have a question however. Most guys would firewall the throttle and pull till they spun the wheels. A fellow with a JD model B started out real slow and let that engine lug down till it sounded like he was running about 60RPM and it just popped away as loud as could be (don't you just love that sound!!) This guy pulled the whole 150 yards (full pull) and never slipped a wheel. It's my first time to watch a pull and I am wondering if that is the best way to pull a 2-cyl? If you don't get it right I think you would stall out rather quick. Any comments?

dave

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Joel Williams

03-02-2001 19:33:39




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 Re: JD pulls in reply to dake K (Fl), 02-25-2001 17:34:52  
I pull a 50 JD R model diesel and I very seldom end the pull at full throttle. The first time it starts to break loose, I pull the throttle back to let it get another bite. I do this several times till it won't bite any more and have won several pulls this way. If you let it spin the first time it breaks loose, your're done. I out pulled two JD G's last year using that method and they are hard to beat. I'm talking stock tractors here now too, the way STOCK tractor pulling is supposed to be. Anybody can hot rod an engine and cheat but you can drive the stock tractors right and usually get what you want. Putting a power block on a JD or turning a red 460 up to five grand is hardly stock pulling.

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Raymond Bagwell

10-17-2003 13:58:43




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 Re: Re: John Deere H in reply to Dave K, 10-15-2003 14:17:06  
I have used 2 new carbs rebuilt by a well known rebuilder. No adjustment seems to help. If I do get it running I have to screw the idle screw down quite a bit to make the tractor idle. When it tries to start it will hit hit hit maybe once maybe 10 times and will not open up and run. It appears as long as the magneto is using the spring it tries to run. Eventually it may take off and run just fine until you cut it off. Thanks for the responses.

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dave K (fl)

02-27-2001 18:20:52




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 Re: JD pulls in reply to dake K (Fl), 02-25-2001 17:34:52  
Thanks fellows, now I understand it better. This pull I was at were stock tractors. The sled was an affair that had a set of wheels under it and as you pulled the axel and wheels moved rearward, transfering more weight to the track (drag) as far as I could tell.

Dave



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LDL

02-28-2001 05:19:25




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 Re: Re: JD pulls in reply to dave K (fl), 02-27-2001 18:20:52  
Have never seen a stock B pull real well around here. Usually most have $$$ stuck in engine. Was this a power track or gravel?



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RichardS

02-28-2001 15:11:11




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 Re: Re: Re: JD pulls in reply to LDL, 02-28-2001 05:19:25  
I have a '50 JD B that pretty much rules the 4500# Farm Stock Class. It has had some engine work done but still falls in the 10% RPM variance allowed for the class. I actually beat my uncles '47 JD A once. It has a stroker kit, runs on racing fuel and has cut tires.
We run on dirt with a weight transfer sled. Don't run it much in the Antique class's that allow cut tires, can't compete.



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LDL

02-26-2001 20:40:54




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 Re: JD pulls in reply to dake K (Fl), 02-25-2001 17:34:52  
Was this a stock pull or could they modify the engines for more power?



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John Tdake,

02-26-2001 12:01:29




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 Re: JD pulls in reply to dake K (Fl), 02-25-2001 17:34:52  
Dake, as Ive said many times on here, Horespower is a function of Torque X RPM and the JD's, with the long stroke, get most their horsepower from torque, which is why even if the RPM lugs a little, they are still cranking out decent HP at the end, as opposed to high RPM Ollies which (way less torque) get more power from higher RPM and, therefore, their power fades off bad when they lug down. However, the fast ground speed off the line when the high revvers are at peak HP is what stores that early energy in the momentum (KE = 1/2 MV squared) of the moving sled and helps them. So, in a slow dead lug long pull the high torque JD's shine, but if the Ollie can get enormous momentum and early ground speed up, then they are tough as nails. The max friction on the track is just BEFORE the wheels loose traction, which is why you want to be geared as high as possible with enough power to just spin out at the very end and the front end floating to transfer all weight possible to the rears. Good luck Ol John T

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luke

02-25-2001 18:25:25




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 Re: JD pulls in reply to dake K (Fl), 02-25-2001 17:34:52  
there are different ways to look at this. the main factor is the type of sled you are pulling against with the tractor you have...sleds in my area are mechanical and hyd. mechanical sleds seem to be pulled better at wot (wide open throttle) you have more inerta (sp?) and will get the sled further. a hydraulic sled puts force down over a certain length after a certain distance. the further you can go before max force, the better off you are. on hyd sleds i tend to go at half throttle with a gear that puts me at the max speed limit. if start to slip some, i throttle off some to regain my traction and throttle up again. of course you need the brass to do this but it works for us here in north dakota. i prefer the mechanical sled with no speed limit.
my .02
luke

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