Classes
& Rules
2010 Smokin Iron Classes:
 Super
Farm Tractors
Two
Wheel Drive Trucks
Four
Wheel Drive Trucks
Modifieds
Semi
Exhibition
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Super Farm
Tractors
Super Farm Tractors
(SFT) are closest to "off the farm" workhorses as you will find in NTPA
competition. Engine size is limited to 640 cubic inches, they must use
the OEM manifold and heads for that brand engine and can only use one
three inch turbo. Diesel fuel is still the only permitted fuel and tire
sizes are also the same as Pro Stock Tractors. The fuel pump is limited
to a "P" type pump and competitors must use the stock intake and
exhaust manifold for that brand engine. The Super Farm class is
extremely competitive and any competitor has a shot at winning.
Two
Wheel Drive Trucks
These are the
"Funny Cars" of tractor pulling - the "wheel standers". You are as
likely to see a Ford Thunderbird in this division as you are to see a
T-bucket, you could see a Chevrolet S-10 or a Willy's Jeep. Regardless
of the vehicle bodies, they will all be powered by a big block V-8 with
a super charger in most cases, but with a sprinkling of turbo-chargers.
This division competes at a weight of 6,200 lbs.
Four Wheel
Drive Trucks
Perhaps the closest
in appearance to what the average pulling fan drives on the street, the
Modified Four Wheel Drive trucks are also the only "naturally
aspirated" division in NTPA competition and utilize both rear and front
wheels to pull. With no turbo charger, or super charger to force air
into the engine, a competitor in this division must rely on the engine
itself to pump as much air as possible and that means that engine
settings like the proper air/fuel ratio are more important than ever.
Chassis setup, gearing, tire pressure, and the driver all must be
perfect to win in this division.
Modifieds
Modifieds utilize various powerplant
arrangements, such as multiple supercharged engines, twin V-12 Allison
aircraft engines, and even jet turbines, developing approximately 5,000
horsepower at 100 M.P.H. wheel speeds. These multi-engine monsters are
sure to please those hungry for horsepower.
Super
Semis
Tractor Pulling is
called the "Heaviest Motorsport on Earth" and the Super Semis are the
heavyweights of tractor pulling. Weighing in at 20,000 lbs., these
behemoths overshadow everything else on the pulling track and for that
matter, anything else in motorsports. When they come thundering down
the track, the heavier the load gets, the harder they pull. Sometimes
you wonder if they'll ever stop. The Super Semis are one of the most
popular divisions of NTPA pulling.
2010
NTPA Rulebook
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Click
here to order a copy of the NTPA 2010 Pulling Rulebook.
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