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Tractor Pulling Discussion Forum

Gears Classes for a Super M

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Newcomer

10-30-2005 17:56:20




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I plan to pull for the first time w/ my '53 Super M. Motor has been rebuilt to 55 hp. Tires are 70%. Stock wheels, straight rig, nothing fancy.
I've heard that over 50 hp the tires will spin pulling in first. Second gear is a better choice to get the power to the ground. Is this true?
Also, how is it that a tractor can enter different weight classes? If a tractor weighs 5500# isn't that the class it's in? What's the advantage of a Super M moving up or down in class? Thanks.

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ChadS

11-03-2005 10:30:05




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-30-2005 17:56:20  
My Super M runs anywhere from 6000-7000 lbs farm stock, low gear, its about 62 hp, at 6000 with 14.9's Ill spin out, at 6500, it goes a little further down the track, works the engine nicely, at 7000, Its running out of power but usually out pulls em distance wise when it does that. 55hp is pretty good for what you have, but Ill bet, that the lighter you go, the harder it will be to hook the tires. But, if you did lighten it way up, and put the weights in a good spot to balance it out and make it pull, you may just do very well! I know next year, Im putting a few extra ponies in my Super M, and going after the molines. Tom, better step up in the game now, cause its about to get real ugly, (especially if ya allow 18.4's!!!!) ChadS

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JakeF

10-30-2005 18:59:01




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-30-2005 17:56:20  
I have 60HP with my super M and run 6K and 7K classes. I can't do as well in second as in first running in the 6K class so I've never tried it in the 7K class. With my engine at 1950RPM I'll spin out in first in either class, and have to be carefull not to break the 3MPH limit. If I go to second it's even worse for breaking the 5MPH limit in that class. I'm running 14.9 tires. Jake



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Newcomer

10-31-2005 03:40:40




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 Re: Gears Classes for a Super M in reply to JakeF, 10-30-2005 18:59:01  
JakeF
Thanks for answering.
Now what's the deal w/ running in different classes?
Why weigh a tractor if you can choose a different class?
What's the advantage for your SM?
Thanks



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JakeF

10-31-2005 19:21:44




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-31-2005 03:40:40  
My SM has a wide front so I can't get down to 5000 pounds so I run it in 6K & 7K classes. Our rules don't allow much in the 3MPH classes, so I can't go to pressed steel wheels. In 6000# I only have 320#'s to move around, as the bare tractor with me on it weigh's 5680. I have weight brackets at the front, behind the front axle, just ahead of the rear axle and studs to mount weight on the rear wheels.

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TOM GRAVERSON

10-31-2005 13:01:41




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-31-2005 03:40:40  
heres the deal, i run my DC case in four classes 45-55-65- and 7, just ad weight to balance have four times the fun tom



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JCS OH

10-31-2005 08:38:26




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-31-2005 03:40:40  
There are "classes" and there are "classes"...

Weight classes are obvious.... other "classes" (I think better called "divisions") have to do with how modified your tractor is, how fast you are allowed to pull the sled, how high your hitch can be, what size tires (and how you are allowed to sharpen them), etc. Divisions rules and names vary by local club(e.g. NATPA-Div I, Div II, etc; USAP-Super Farm Stock, Modified Stock, etc.)

As you move up in weight and speed, you will need more power. As my general "Jim's Rule", to be competitive, your tractor should have power equal to or greater than the product of the weight (WT in lb) and speed (in MPH) divided by 300.

HP>WT*MPH/300

For 3 MPH and 5500#, this is a 55 Hp tractor. Note that for 4 MPH and 6000#, this is an 80 HP Tractor.

Jim

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colekicker

10-31-2005 08:27:29




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-31-2005 03:40:40  
Remove as much stuff off the tractor as possible, ie: hydraulics. Get the tractor as light as possible so you have a better power to weight ratio. Then, you have the ability to add suitcase weights where you need them, or a more technical term would be "moveable weight". This way you can put enough behind the axle that you can get it balanced to life the front, and put enough on the nose so you can keep it just off the ground. Just look at what the people who are winning do. They must be doing something right. They wouldn"t be winning if they weren"t.

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super_m

10-30-2005 18:02:08




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 Re: Gears Classes for a Super M in reply to Newcomer, 10-30-2005 17:56:20  
with 55 horsepower i would keep it in 1st all the time on a hard and soft track



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it depends

10-31-2005 15:05:53




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 Re: Gears Classes for a Super M in reply to super_m, 10-30-2005 18:02:08  
it just depends on your area, track, sled, etc. at a lot of places 55 hp would pull 7500 lbs just fine. where I pull 55 hp would choke at half track at 7500 lbs. so it just depends. try it and see.



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