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Tractor Pulling Discussion Forum

The scientific approach - tractor pulling formula?

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Zack Peterson

04-15-2005 11:23:50




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I am setting up an Allis Chalmers CA tractor for our 3000lb classes out here in Oregon. Our drawbar rules are 21" high and 18" from the center of the rear axle. I took the Allis CA (which has a wide front) to our local truck scale the other day to weigh it. It was 2800lbs, and 2000lbs (72%) were on the rear axle, 800lbs (28%) on the front. Has any body ever kept track of their "split weights" in determining where the optimal weight balance is? I have been tractor pulling for years with various tractors and have done some calculations, and of course used trial and error. Just for comparison I took my MM BF to the same scale and weighed it at 2750lbs. It also has a wide front but it's split weights were 950lbs (35%) on the front and 1800lbs (65%)on the rear. I will of course be loading them up to 3000lbs for the next pull, but I thought I'd see if anybody had any ideas about what percentage of weight to run on each axle. For example, if you decided to use a 30-70 rule, you would load the tractor to have 900lbs (30%) on the front and 2100lbs (70%) on the rear. These percentages may be applicable to any weight class. Of course track conditions may change loading but you could just have different percentages for a given track (ie- soft or hard setup). I guess I'm trying to devise a formula for tractor pulling but there may be too many variables. Any ideas?

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Chain length

04-17-2005 09:47:30




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 Re: The scientific approach - tractor pulling form in reply to Zack Peterson, 04-15-2005 11:23:50  
One more big factor to consider is the length of the chain that hooks to the sled, actually the angle it makes when hooked to your tractor. That has a big effect on the weight transfer from the sled to the tractor. With the 21" drawbar height you can get some good transfer rates. I'm guessing that you will need some added weight on the front of your tractor for sure.



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AO

04-15-2005 12:58:06




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 Re: The scientific approach - tractor pulling form in reply to Zack Peterson, 04-15-2005 11:23:50  
I start my WD at 80% rear and 20% front and adjust to track conditions, I have concidered a bracket in front of the rear wheels. Just never did it.



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