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2008 Southern Invitational 1.) Drawbar hook point is to be a minimum of 18 inches behind center of rear axle and a maximum of 20 inches high. Drawbar is to be rigid in all directions. Hitching eye is to be a minimum of 3 inches in diameter and a minimum of ¾ inches in thickness. Drawbar must have on inch of steel from outside of hole to outside of drawbar. 2.) Area 6 inches wide and 12 inches immediately above the drawbar must be free of all obstruction. 3.) S.F.I. approved clutch, flywheel, and pressure plate are required. 4.) Safety tie bars mounted to the rear axle housing with at least 2 axle housing bolts and extending forward of flywheel area and fastened to side of block or main frame with at least two 5/8 inch bolts; OR a one piece frame extending from front of tractor to rear axle housing mounting bolts. Note – tie bars or frame must be of sufficient strength to support weight of tractor with the bolts used to split the tractor removed. 5.) Flywheel guards must be used. A 20-ply ballistic nylon or 20-ply Kevlar 17 inch wide and long enough to wrap around the bellhousing with at least 6 inches of overlap secured with six 2 inch wide nylon web straps with steel D-ring and sewn the length of the blanket and secured front and rear with straps. 6.) The chassis shall consist of the following: a. The stock engine block or its replacement as listed of the manufacturer for that make. Example: IH tractor must use IH engine. b. The stock transmission housing or manufacturers replacement c. The final drive housing or manufacturers replacement. The original equipment manufacturer engine block or manufacturers replacement cannot be modified externally in any way except normal repairs. No aluminum replacements of engine parts, clutch housing, transmission case, rear end housing or rear axle housing. 7.) Tractor wheelbase will be a maximum of 114 inches from the center of the rear axle to the center of the front axle. 8.) All tractors must have wide front end. 9.) Tractor length of 13 feet maximum from center of rear wheels to the farthest point forward including front weights. 10.) Tire size limit is 30.5x32. No chains, duals, or 4 wheel drives allowed. Double cut tires are allowed with biased type tires only. Cut and ½ are allowed in biased or radial type tires. 11.) Side shields must be equipped and should be of 60 thousands steel or aluminum which is to be securely fastened to the tractor. They should cover from top of the frame to the hoods and as long as the engine. 12.) It is recommended that a quick release fastener be used (winged nut type or cotter pint type hood pins). Reason: ease of access in case of emergency. 13.) All tractors must have fenders or a shield between the driver and tires to consist of a solid barrier between driver and any part of rear tires sufficient to support weight of driver. 14.) Tractors must have a strong and rigid seat with seat belts anchored to something other than the seat itself. 15.) Stabilizer bars are required. The drawbar assembly must in no way be attached to the stabilizer bars. Stabilizer bars will extend a minimum of 32 inches behind a line drawn from the center of the wheel to the ground. The stabilizer pad must not be more than 10 inches off the ground. The stabilizer pad must be a minimum of 8 inches square. A minimum of 20 inches will be allowed from the outside of one pad to the other. Stabilizer bars are not to be mounted in any way to the drawbar. Note – The stabilizer bar system must be able to support the weight of the tractor in the heaviest class pulled. Jacking up the pads so the tractor is completely off the ground will be a good test. 16.) A 2.5 pound fire extinguisher, preferably Halon, must be convenient to operator. 17.) Fire helmet and full length pants are mandatory. 18.) The use of a protective roll cage or R.O.P.S. device is required. 19.) Engine must be manufacturer designed block for that make with factory appearing head for that tractor at the time of manufacture. No aluminum heads allowed. 20.) Diesel cubic inch limit is 470 with one turbo limited to 3" on intake side, no slots or enhancement ring. Diesel tractors under 360 cubic inches may run two 3"x4" turbos. Alcohol cubic inch limit is 370 with one turbo limited to 3" on intake side, no slots or enhancement ring. Naturally aspirated gas/diesel/propane engines may be up to 850 cubic inches. 21.) If turbo has MAF enhancement, or "slots", these must be welded permanently for competition. 22.) Tractor must have 200 lbs. of moveable suitcase weights. 23.) P-pumps or any pump smaller allowed. No French pumps allowed. 24.) Must use stock fuel for make and model of tractor. Gasoline, diesel, and propane are considered stock primary fuels. Ether, oxygen, alcohol, nitrous oxide, nitro methane are all illegal fuels for primary or secondary fuels. 25.) Water injection systems shall use water or a mixture of water and lubricant only. 26.) No pressurized tanks except propane, when used as a primary fuel only. 27.) Turbochargers only. No roots type blowers, belt driven blowers, or superchargers permitted. 28.) No air bleeds or secondary air allowed on intake (compressor housing). 29.) Turbocharger must be under hood or shrouded end to end and 360 degrees around with .60 steel or heavier. It must be shrouded if under a fiberglass hood. 30.) Exhaust pipes must have two 3/8 inch grade 5 bolts set with 1 inch and 90 degrees to each other in the vertical part of the exhaust or pipe. 31.) Tractors must have automatic ignition kill switch and air shutoff in working order at all times. Tractor officials or tech inspectors have the option of checking kill switches as often as they deem necessary. On a spark engine the kill switch must break or ground ignition and shut off electric pumps. On a diesel, the air shutoff must have a spring loaded closing mechanism. To be deemed acceptable it must prevent building boost. It is recommended that a gasket seal be used. A mechanical shut off, controlled from the seat, must be placed in the fuel line before the injection pump. 32.) The kill switch hook up will be located in the rear center of the tractor. Maximum 6 inches off center in any direction approximately 48 inches above its point of hook. A 2 inch ring should be made available to the sled. 33.) All tractors must have a dead man throttle which automatically retards to idle position when released by the operator. 34.) Tractors must have a bulkhead shield between driver and engine from top of hood to op of torque tube or transmission housing or clutch housing from side shield to side shield. This also serves as a flash fire shield. 35.) A safety light system is required on all pulling vehicles. A white light, automotive quality, minimum 2 inches in diameter, must be mounted directly above or below the safety kill switch at the rear of the vehicle. The light must be activated by a shift lever so that when placed in reverse will activate the light. 36.) Tractors must have an electric operated cooling fan. Stock steel bladed fans that are driven by a belt are not allowed. 37.) A .0060ths thick steel shield must run between the frames and under the harmonic balancer to prevent loss of harmonic balancer from the tractor. 38.) Modified intake and exhaust headers are permitted. |