Pulling Terms

AC: An Allis Chalmers Tractor.

Allison: World War II vintage v-12 aircraft engine.1710 cu. In., approximately 2000 horsepower.

Arias: Racing engine brand common in Minis and TWD trucks.

Binder: International Tractor.

Bite: Traction.

Blower: Supercharger.

Boost: Air pressure generally by turbos or superchargers.

Bore & Stroke: Diameter of the cylinders and the distance the piston moves up and down the cylinder.

Box: Part of a weight transfer machine that carries and transfers the weight.

Brush Pull: Non-sanctioned pull.

Cam: The camshaft, a revolving engine part that moves the valves up and down.

Carb: The carburetor.

Chevy: A Chevrolet style engine. Also referring to the Chevrolet brand of cars and trucks.

Chevy Hemi: An engine that uses a Chevrolet style block with Hemi style heads. Arias is a common brand of this style engine.

Class: Type of vehicle and rules used to define that type of vehicle(s). Modified, Super Stock (Open or Diesel), Two Wheel Drive Truck, Mini Modified, Semi, Pro Stock, etc.

Clay: The most desirable track surface.

Cleats: The tread on a tractor tire.

Cubes: Cubic inch displacement of an engine.

Cut Tires: Trim the tire bar to a preferred angle for maximum bite.

Deere: A John Deere tractor.

Diesel: An engine that ignites the fuel by the heat of compression, rather than by spark plugs.

Drawbar: The part of the tractor or truck which attaches to the chain and hook of the transfer.

Drawbar Height: The distance between the drawbar and the track surface.

Drop the Hammer: Hitting the throttle hard.

4 x 4: Four wheel drive.

FWD: Four wheel drive truck.

Fuel: Either Alcohol or Diesel fuel.

Full Pull: Pulling the entire length of the track.

GN: Grand National level of pulling.

Gooney: A puller's helper.

Grenade- Damage to engine, usually terminal.

Headers: Exhaust pipes designed for free exhaust flow.

Hemi: A Chrysler engine with a dome-shaped combustion chamber.

Hired Gun: A driver who drives tractors or trucks other than his or her own.

Hook: The point of attachment to tractor's or truck's drawbar.

Hook Points: Points received for attempting a pull. Each competitor can earn 15 per attempt.

Hooking Up: Tires getting a bite on the track.

Horsepower: The ability to do a specific amount of work during a specific amount of time and over a specific distance. Abbreviated HP.

IH: An International Harvester tractor. (Also International)

Kill Switch: A required hook-up that automatically kills the engine if the tractor becomes unhooked from the sled.

Mini: Small modified tractor, 2050 lb.

Miss the Balance: Improper weight balance on a tractor, either too light on the front resulting in an uncontrollable wheelie, or too heavy on the rear resulting in poor power transfer.

MM: Minneapolis Moline tractor.

Modified: Tractor using any combination of engines, transmission and final drive.

Mopar: Chrysler products.

NTPA: The National Tractor Pullers Association, Inc.

Out the Gate: A full pull, going the entire length of the track.

Overspeed: A safety device on turbine engines to keep them at a safe operating speed. If achieved engine will shut down.

Pan: Part of the weight transfer that makes contact with the track to create the friction necessary to stop the tractor.

Pits: Area for pulling tractors and trucks to park.

Points Champ: The person who has won the most points at season's end.

Power Track: Track made with the combination of water and clay to pack, requiring a lot of power from the tractor to pull the transfer.

Pro Stock: One turbo charger and limited alterations being allowed in a class.

Pull-Off: A second pulling contest for pullers going past the full pull mark.

Purse: The total prize money awarded at an event.

Read the Track: Determine track conditions (soil type, soil texture. etc.) foweighting tractor and spotting sled.

Revs: RPMs or revolutions per minute of the crankshaft.

Sanctioning: A contract, which evidences the event's commitment to follow national rules and regulations of the sport and to provide a safe environment for the participants and spectators.

Second Attempt: If, on the first try, the tractor doesn't move the sled to the 100 foot line, the puller can try again.

Skid: Pan of the sled.

Sled: Weight transfer machine.

Slider: A clutch which uses the centrifugal force inherent in the spinning of the clutch to activate the clutch mechanism (also a Slipper Clutch).

Slip the Clutch: Prevention of 100% lock-up of the clutch, used to hook up the tires to the track. Also means a malfunctioning clutch which never locks up.

Smoke Machine: Used at indoor pulls, attaches to weight transfer machine, sucks exhaust smoke from tractor outside.

Smoker: Vehicle using diesel fuel.

SOHC: Single Overhead Camshaft engine.

Spotting the Sled: Puller choosing where the sled will sit along the start line for the pull.

Squeaked It Out: Barely pulling past the full-pull mark.

Staged: Lined up at the starting line. Also connecting turbochargers in progressive sequence on super stocks.

Super Stock: Refers to multiple turbochargers with few limitations to alterations in the given class.

Test Puller: First puller of each class to check sled gear and weight. Has option of re-pulling or dropping six positions, or dropping to last.

Throw Weights: To move detachable weight around on the tractor to achieve a preferred balance of weight for track conditions.

Torque: The power needed to twist or pull under counter pressure.

Transfer: Weight transfer machine to which the tractor hooks to pull.

Turbine: An engine using the exploding fuel to drive rotary fan blades, creating the turning power of the engine, as in aircraft jet engines.

Turbo:Turbocharger (an exhaust powered compressor adding power to the basic engine by adding more air).

TWD: Two wheel drive truck.

Under the Turbos: Not being able to keep engine speed up to the proper levels to maintain turbocharger pressure.

Weight Classes: 6200 Ib., 7200 lb., etc. The maximum weight of the tractor and driver for a particular class.

Wheelie: Lifting the front wheels off the ground.

Wrench: To repair, work on tractor.




Contact Info

  • ADDRESS:
    National Tractor Pullers Association
    6155-B Huntley Road,
    Columbus, OH 43229
  • PHONE:
    (614) 436-1761
  • FAX:
    (614) 436-0964
  • WEBMASTER EMAIL