2008 Southern Invitational
12,000 lb. Hot Farm Rules
1.) Weight- 12,000 lbs.
2.) Brakes - All tractors must have working rear brakes capable of sliding the rear tires.
3.) Drawbar - Must be a minimum of 18 inches behind center of rear axle, a maximum of 20
inches in height, and be rigid in all directions. Hitching eye to be a minimum of 1
inch thick with a 3" by 3.5" inside diameter hole.
4.) Stabilizer Bars - Stabilizer bars are required (no wheels allowed). The stabilizer bars
cannot be bolted, welded, etc. to the drawbar in any way. The stabilizer bars must extend a
minimum of 32 inches rearward from the center of the rear axle. The skid pad cannot be
more than 10 inches off of the ground. The skid pad must be a minimum of 5" by 5" square.
A minimum of 20 inches is allowed between the two skid pads. No cross bars are allowed
on the stabilizer bars behind the point of hook. In addition to stabilizer bars, the vehicle
must have a brace that extends vertically 12" from the rear most tip of skid pads. There
must be a support brace extending inward to frame, axle or top of stabilizer bar arms.
Materials used must be of minimum strength of materials used for stabilizer bars. Design
and material must withstand severe impact of sled. Vertical brace should extend rearward a
mimimum 2" from radius of rear tires.
5.) Chassis - Maximum of 114" wheelbase unless originally produced with a longer wheelbase
at which point the wheelbase will remain stock. Maximum length of 13 feet from center of
rear axle to forward-most point of vehicle excluding the front hitch. Wide front-end required.
6.) Tires - No cut tires allowed. No four wheel drive. 20.8" tire max.
7.) 3,000 RPM max. P-pumps or smaller allowed - Vehicle must have an ISSPRO
#019R8906 SINGLE MAGNET magnetic pick-up attached to the front of the engine to measure engine RPM's.
The lead from the pick-up to the rear of the vehicle is to be made of 14 - 16 gauge wire
attached to a 110V, 3 prong female electrical outlet. The 2 wires from the pick-up need to
be attached to the 2 main spades, not the ground spade, of the electrical outlet. This outlet
receptacle needs to be mounted next to the rear mounted air shut-off cable. Wire must be
one (1) continuous wire outside the side rails and visible. NO SPLICES.
8.) Engine - OEM stock block, head, intake manifold & exhaust manifold must be used for make
and model of vehicle being entered. No after-market components allowed.
9.) Turbo - 3.0" maximum diameter inlet and outlet. Map-width enhancement grooves allowed.
Exhaust must have two 3/8" bolts, grade 5 minimum, positioned in the exhaust tube 90
degrees to each other, and within 1 inch of each other.
10.) Fuel - Diesel fuel only. Water injection allowed. Inter-coolers allowed.
11.) Throttle - Throttle lever must have a spring installed such that if the throttle lever is released,
the engine will return to an idle. Throttle must function such that moving the throttle lever forward
increases the engine's RPM.
12.) Clutch Blanket - Tractors must be equipped with a minimum of 17" wide, 6-strap SFI
4.2 clutch blanket. Blanket must over-lap a minimum of 6 inches.
13.) Fire Extinguisher - Vehicle must be equipped with a minimum of a 2.5 lb dry-type or a
2 lb Halon-type fire extinguisher. Fire extinguisher must be located within easy reach of the
operator. Fire extinguisher must be fully charged.
14.) Pressed steel wheels permitted.
15.) Side shields mandatory if tractor has a factory fan blade.
2007 Southern Invitational
12,000 lb. Hot Farm Rules
16.) Air Shut-off - Vehicle must have a cable-operated engine air intake shut-off device. Device
cannot be a 'butterfly-type' and must be spring-loaded. Cable must be located approximately 4 feet
above the point of hook and within 6 inches of the center of the vehicle. Device must prevent the
engine from building boost. The sled requires a 2 inch ring or equivalent be attached at the end of
the cable. Mount cable in clear view. Do not mount below weights.
17.) All drivers must wear helmet and fire suit.
18.) All tractors must have fenders and must support weight of driver.
19.) Tractors must have a factory ROPS and quick-disconnect lap belt. It is optional to have a
roll cage with an SFI, 5-point harness.