Drawbars
- Drawbars shall meet the following: drawbar to be a minimum of 2 square inches total steel material at any point. This includes the area of the pin with the pin removed. The pin will be a minimum of 7/8 inch. Drawbar must be equipped with a steel hitching device not more than 1.5 x 1.5 square, (or 1.5 round), and with an oblong shaped hole 3.75 inches long and 3 inches wide. No drawbar support tubes attached above the centerline of the rear axle, unless using the stock drawbar support for that make and model. Absolutely no drawbar supports designed to pull only from, or to be attached only to a point above the centerline of the rear axle.
- Drawbar maximum height 20”
- Drawbar to be no shorter than 18” from center of axle.
Engines
- Each competing vehicle must have a working RPM pick up on their vehicle. The pick -up must be wired uninterrupted to a common 3 prong household electrical receptacle that is to be mounted on the back of the vehicle directly above the drawbar area. The pick- up MUST be in working order during competition. If a competitor’s pick up does not work at an event, a competitor may be hand tached immediately after leaving the track after a competitive pass. A competitor mut be tached trackside. If a competing vehicle leaves the track area before being tached, the vehicle will be disqualified.
- If a competitor’s pick up does not work at an event, they have until the next event to repair the problem. A competitor will not will not be eligible to compete 2 event entries in a row with- out a working pick up.
- Engine must be stock block and head for that make or model. Direct OEM replacement allowed (with board approval)
- Engines are limited to factory intake and exhaust manifolds for make and model of engine. Safety related replacement manifolds may be used with board approval. Adapter plates for turbo will be allowed, plates thicker than 1” must be approved by board. Intake inlet will remain in factory position and factory size. Adaptors will be allowed to make connection between turbo and intake. If manifold to cylinder head spacers are required tor clearance they will require board approval.
- No intercoolers allowed. OEM agricultural intercooler manifolds are allowed (if factory for the make and model tractor pulling) without any cooling assistance hooked up.
- Tractors are limited to 466 cubic inches.
- Engine RPM is limited to 2500RPM maximum or 2750RPM if engine is 430 cubic inches displacement or less.
- Turbo will be an S362 and will be purchased through Suits Farm Garage. You will have a choice of three exhaust housing sizes. No modification to the exhaust wheel allowed. There is a turbo claim rule. A competitor can purchase your turbo at any time for the cost of a replacement turbo. Other specified “box” turbochargers may be allowed at the discretion of the board of directors and may be subject to additional performance adjutments.
- Injection pump can be stock appearing or can be “upgraded” to up to and including a P7100 pump.
- No de-cubing allowed unless unanimously approved by the IPA board.
Chassis
- Tractors are to be stock appearing other than safety items. This is a Field Stock class and should be presented as such.
- Engine, transmission, frame rails and rear end housing must bolt together in factory position.
- Must run OEM wide front axles and OEM rear axle housings for that make and model of tractor. (including Planetary axle)
- Factory sheet metal required no aftermarket sheet metal or radiator supports allowed.
- All wheels will be steel (pressed steel rear rims will be allowed). Aftermarket hubs are allowed for pressed steel rear rims.
Exhaust Systems
- Exhaust must exit vertically with no rain caps.
- Turbocharged engines must have two 1/2-inch grade 5 bolts in horizontal portion of exhaust pipes as close to exhaust flange as possible. Bolts are to be installed 90 degrees of each other and within one inch of each other.
Fuel and Fuel Containers
- No nitrous oxide, oxygen or nitro methane.
- Tractors must run on diesel.
- No water or alcohol injection.
Kill Switches
- All diesel competing vehicles must have an air shut-off and fuel shut off in working order at all times.
- On a diesel tractor, the kill cable must activate the air shut-off and fuel shut off required on a diesel engine. A cable may be used for this purpose, but must have positive type enclosed cable for the air shut-off. The cap must have a spring-loaded closing mechanism. It is recommended that a gasket / seal arrangement be used to more effectively shut off air flow. Door or rain cap air shut offs (no “butterfly” type) will be required on all self-ignition engines with a separate control for the driver. Control for driver not to be the same as for the sled. No electrical operated air shut-offs allowed.
- Track officials and/or tech inspectors have the option of checking kill switches as they feel is adequate at any event. It is recommended that all kill switches be check on all competing vehicles at every event.
- All kill switches must be mounted independent of drawbar and/or wheelie bars / stabilizer bars.
- The kill switch must be located in the rear center (maximum of 6 inches off center in any direction), approximately four feet above the hook point.
- The breakaway kill switches must have attached to them a minimum of a 2-inch diameter ring, with a minimum 1/8-inch cross-sectional thickness. The cable from the sled will be attached to this ring.
- Portion of the kill switch and mounting bracket(s) must be able to withstand 32 pounds of pull per switch when pulled independently or collectively.
- If vehicle has a kill switch or shut-off located in a legal position, and during the pull it is pulled and the nylon strap is broken, and the presiding judge inspects and finds switch capable of operating properly under normal conditions, vehicle will be allowed to re-pull immediately or drop six positions. Decision to drop must be made before vehicle leaves the track. It is the puller’s responsibility to see that the official checks the switch before leaving the track.
- Diesel engines must have a fuel shut-off valve control within easy reach of driver (your normal fuel shut-off on diesel pump). All diesel engines must be equipped with an emergency shutdown air shut-off at the air intake, which can be utilized from the tractor seat.
Stabilizer Bars
- Stabilizer bars are required. The drawbar assembly will not in any way be attached to the stabilizer bar assembly.
- The stabilizer bar must extend a minimum of 32 inches behind a line drawn from the center of the wheel to the ground. Pad must not be more than 10 inches off the ground at 32-inch point and be measured during hitch check before competition. The stabilizer pad must be a minimum of 5 inches square with a minimum of 20 inches allowed from outside of one pad to the other. No crossbars between stabilizer bars allowed behind point of hook.
Safety
- Any engine driven fan must be shrouded 360 degrees.
- If an Illiana Pullers Association track official or tech official feels a vehicle is unsafe, they have the right not to allow vehicle to pull. Track official or tech official has the right to bar a competition vehicle from competing if he or she believes that the vehicle has a potential safety problem.
- All pulling vehicles must be equipped with a minimum of 2 lb Halon type or 2½ lb dry- powder type fire extinguisher, full charged with a gauge, in working condition and convenient to the operator.
- All tractors must either run safety tie bars mounted to rear axle housing with at least four axle housing bolts and extending forward to 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. Tie bars or frame must be sufficient strength to support weight of tractor with the bolts removed.
- Seat Belt required.
- OSHA approved ROPS are required. ROPS must meet factory weight of tractor.
- SFI clutch blanket is required. Bell housing blanket must meet the following construction criteria; 17 inches wide and long enough to wrap around the bell housing with at least 6 inches overlap, secured with six 2 inch wide nylon web straps along with four 2 inch nylon web retaining straps each at the front and back of the blanket.
- Bell housing blanket straps are to be fastened forward and rear of the clutch / flywheel assembly. All straps must be securely fastened and the blanket must be secure against the rear face of the engine block.
Tires
- Tire size is 18.4-38 or 20.8-38. No duals, chains or four-wheel drives.
- Top cut tires are allowed. Cut must not be into the casing of the tire or on vertical face of tread.
Weights
- Maximum weight for tractor and driver is 10,500 lbs.
- Weights must be safely secured and must not extend rearward beyond rear tires. No weight frame may extend more than 24″ beyond the furthest forward factory point of the tractor.
Competition Clause.
- In the event that one make and/or model of tractor dominates the board at its discretion may change class rules (for that make or model of tractor) to maintain the “equality” across all brands and models of tractor. This is presented as a beginners’ class and will remain as such as determined by the IPA board. The IPA encourages the diversity of brands of tractors in this class and will do its best to keep the class competitive for all colors of tractors.
- Potential rule changes included but not limited to:
- Shift under the green flag
- RPM (+/-)
- Weight
- Any IPA board member participating in the 10500# Field class may not vote on any “competition” rules changes.
All General Competition rules apply (applicable to class)