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Tractor Talk Discussion Forum

pulling a tractor question

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1965LONEWOLF

08-31-2007 04:41:52




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OK , I WANT TO HEAR FROM THE EXPERTS ! IF I PULL IN SECOND GEAR AND I HAVE A CHOICE OF 1200 RPM, 1500 RPM OR 2300 RPM'S - WHICH WOULD DO BETTER A PULLING A TRANSFER SLED ? IN A PERFECT WORLD IF YOU HAD A CHOICE OF THESE 3 DIFFERENT RPM RANGES WHICH WOULD YOU PICK ? I BELIEVE THAT AT 2300 RPMS THAT EVEN THOUGH ITS REVING THAT HIGH , THAT IT WOULD BE BETTER AT 1500 RPMS SO ITS IN ITS TORQUR RANGE ? PLEASE GET BACK TO ME - THANKS

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Janicholson

08-31-2007 16:25:38




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 04:41:52  
Engines make the most horse power when they are turning as fast as they can fill their cylinders. This means that (in most cases, faster RPM will provide more HP up to the point where the valve train, and intake system (including manifolds, carb, and ports) are drawing a partial vacuum) As the engine is pulled down in speed by load, it approaches a different plateau, the torque peak. Torque is what keeps pulling even at lower engine speeds, and it is where the cylinder filling, and combustion efficiency and the mechanics of the connecting rod geometry provide the greatest force on the crank. Ballancing the power such that the tires slip least at the speeds being pulled, the type of sled, and other factors, make the issue one of practice. Setting the RPM and leaving it there is usually like a snap shot film camera, if it isn't sunny, it is a bad exposure. Play with it. Tractors with 5000hp are different than those with less than 100. JimN

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Dick L

08-31-2007 08:25:56




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 04:41:52  
Tractor pulling goes thru a learning curve like most everything. You find out what your tractor will do by trying different things at different times. No amount of advise will short cut this learning curve. Advise just narrows the range of things to try. Then only if you pay attention to the advise and to what your tractor will do under different conditions. What works one day does not necessarily work the next. Most changes to the tractor on the track such as RPM's brakes, and gear choice are split second decisions that come from instinct built up over years of operating a tractor under different conditions.

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Walt Davies

08-31-2007 08:08:23




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 04:41:52  
Lonewolf, I think that you are on the right tract here you need to work with the tractor try to get your weight so that it is just below the next class this will help a lot. I pull Case LA and so far I have found it runs best at full RPM (i have it setup at just below 1600. You need to make test at home try tying the thing to a big tree in soft dirt and see what RPM the tires break free. I notice that a lot of the bigger tractors start out out at a low RPM then increase it as the go down the tract trying to keep it just below where the tires break free.
Walt

PS don't let these guys get to you an try not to use Capitals for your post as its considered to be Yelling an not very polite.

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buickanddeere

08-31-2007 06:46:19




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 04:41:52  
I have to ask if you are being serious or if you have zero experience on or around a tractor? b.t.y. The all capitals is very rude.



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1965LONEWOLF

08-31-2007 07:08:31




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 Re: pulling a tractor question in reply to buickanddeere, 08-31-2007 06:46:19  
WHAT ARE YOU A JOKER ? I VE BEEN AROUND TRUCK PULLING FOR 20 YEARS BUT TRACTORS ARE DIFFRENT , DON'T KNOW THE HORSEPOWER BUT I AM GUESSING AROUND 75 - 90 HP , FARMALL M TRACTOR , ITS BECAUSE I PULL AGAINEST A OLIVER THAT PULLS IN 1 ST GEAR AND KEEPS IT AT 1000 RPM AND CRAWLS DOWN THE TRACK . I AM IN THIRD AND IF I TRY TO GIVE IT TO MUCH GAS IT FEELS LIKE THE TIRES WANT TO SLIP A LITTLE - THATS WHY I ASKING ABOUT HTE RPM QUESTION

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John (MO)

08-31-2007 10:40:13




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 07:08:31  
Most rules limit you to a small % of RPMS over factory. So I doubt you are going to be able to run the high RPM numbers. Besides that isn`t typically where old tractor engines make their power at. If you are running in 3rd gear with a Farmall M, I have to wonder if you do not have a speed limit. I think you need to take a lesson from that guy that is beating you. He obviously knows where the power curve of his engine is and he is using that knowledge to blow you off the track. IT AIN`T ALL ABOUT SPEED DUDE. IT`S ABOUT HOOKING THE HORSEPOWER TO THE TRACK. ANY HORSEPOWER THAT AIN`T HOOKED TO THE TRACK IS USELESS.

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John (MO)

08-31-2007 06:44:37




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 04:41:52  
What tractor? what engine? what mods? what class? Have you had it hooked to a dyno to know where your power curve is? You got to try and meet us part way or we are really shooting in the dark.



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1965LONEWOLF

08-31-2007 07:09:46




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 Re: pulling a tractor question in reply to John (MO), 08-31-2007 06:44:37  
HI JOHN , PLEASE READ THE LAST REPLY I LEFT AND SEE IF YOU HAVE ANY IMPUT SIR - THANKS



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Mike (WA)

08-31-2007 08:22:42




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 07:09:46  
There are guys on this board who could be helpful, but feel strongly enough about the capital letter thing that they will not answer if that's the (upper) case. Pun intended. If you want information, no use trying to buck the tide.



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1965LONEWOLF

08-31-2007 12:50:02




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 Re: pulling a tractor question in reply to Mike (WA), 08-31-2007 08:22:42  
i could give two !@$#%*&^%$ what someone says about me using capital letters - but thanks for the support sir



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Mike (WA)

09-04-2007 08:33:57




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 Re: pulling a tractor question in reply to 1965LONEWOLF, 08-31-2007 12:50:02  
Wow, you are a little sweetheart, aren't you? I think your handle is well chosen. Maybe you could just tractor-pull yourself off into the sunset, and leave this board to folks who try to get along with each other.



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