Section 12 - TRUCK GENERAL RULES¶

Unless specifically outlined below in the Truck General Rules the overall General rules outlined above will apply.

Any owner that is found illegal by tech and knows they are legal may prove themself by tearing down. When any vehicle is found illegal for cubic inches, the vehicle and owner will be suspended for 1 year and ten (10) days and will lose points for the entire season.

12.1 - Truck General: Operator’s Compartment¶

No fuel tanks, fuel pressure gauges, fuel pumps and/or fuel lines are allowed in the operator’s compartment.
If the fuel tank is located behind the driver, a fire barrier is required from the firewall to the rear of the driver’s seat. (0.060-inch aluminum or steel is an acceptable fire barrier material.)
No radiator, heat exchanger and/or water hoses allowed inside the operator’s compartment.
If a battery is inside the operator’s compartment, it must be safely enclosed and securely fastened

12.2 - Truck General: Drawbar / Hitch¶

Drawbar height or distance from center of rear axle cannot change during the pull.
Hitch point to rear axle centerline must be a minimum of 36% of wheelbase for pro stock and 30% for modified.
Primary hitch must be secure to the vehicle frame and rigid in all directions.
The hitch stem may be any length, as long as the point of hook is not less than the minimum % rule of wheelbase, maximum distance cannot change during hook.
The hitch stem angle must not exceed 25 degrees measured on the stem with angle finder. Main stem must be straight from point of hook to pivot point (on same plane)
Adjuster going to rear end must be attached on center line or lower.
Hitch adjuster support (turnbuckle sear) must be vertical.
Hitch adjuster must be located no more than 6 inches from point of hook. (This does not apply to the Diesel 3.0 Truck class.)
Hitch height cannot exceed 26 inches from the point of hook to the ground or track. This maximum cannot change during pull.
For Pro Stock and Modified Trucks, no drawbar angle greater than the angle of the sled chain. Acceptable angle is 0 degree to a maximum of 25 degrees. This will be measured by the angle of a straight edge from the point of hook to the center of the pivot point.
Hitch cannot pull from the rear end.
An area five (5) inches wide and twelve (12) inches high immediately above the drawbar must be free of all obstruction (including weights, wheelie bars and second drawbars) for ease of hooking and unhooking.
No L-shaped drawbars or trick hitches, which will be enforced by putting a straight edge from the point of the hook to the center of the pivot point.
If a body extends more than twelve (12) inches behind point of hook, the open area must be eighteen (18) inches above the drawbar and 24 inches wide at rear most point of body.

12.3 - Truck General: Body / Chassis¶

All side doors must be on and closed during competition.
Vehicle doors must have a single latch design, allowing the door to be opened from both the inside and the outside.
Front and back safety glass or Plexiglas required.
Flip-top body type vehicles and vehicles that do not have two (2) working doors, or less than stock size window openings, must have:
1. Door glass lowered or removed while under green flag
2. An escape hatch with a minimum size of 17 inches X 18 inches.
3. Working left hand door RECOMMENDED for safety issues.
4. An on-board Halon fire system with a minimum of three nozzles located in driver’s compartment/engine compartment. Must not be expired.
May compete without bumpers, tailgates, van rear doors for greater hook point visibility.
Truck bodies may be a fiberglass complete body or components.
A Vehicle box must have a floor or bed cover.
Vehicles must have vertical bumpers at the rearmost point of the vehicle. Bottom of bumper to be a minimum of 18 inches from the ground. Bumper to extend a minimum of eight (8) inches vertically. Must be rigid.
Tinted or shaded windows hindering the driver’s vision out the front or back will not be allowed.
Flip-top or funny car type vehicles must have the body in lowered position before vehicle may be moved under its own power.
Flip-top bodies must have a safety lock to hold up the body.
Body may be raised to start engine and may stay raised while engine is running as long as vehicle is not in motion.
A complete firewall is mandatory. No holes except for controls. Must be a minimum of one of the following materials, 1/16” aluminum, 1/16” steel or 1/8 Lexan may be used. Firewall must extend downward to bottom of the frame.

NOTE: Escape hatch will not be counted as a working door

12.4 – Truck General: High Pressure Common Rail Fuel System – Safety Shutdown¶

All diesel engines equipped with High Pressure Common Rail Fuel System (HPCR) are required to incorporate a manual switch that can be operated by track official that will disconnect battery power supply to any fuel injection control ECU and injectors. This includes disabling any aftermarket dash, tuners, modules, or ECU that controls, monitors, or supplies power to HPCR fuel injectors. When manual switch is activated, the engine must stop running immediately. Tech Official may request this feature be demonstrated at anytime during inspection. The main battery disconnect can be used for this purpose if that switch is labeled and located in the required position.
1. Pro Street Diesel 2.6 4X4 Trucks, Pro Stock and Super Stock Diesel 4X4 Trucks - HPCR disconnect switch must be located at left end of the front weight box or weight rack. Switch must be easily accessible and identifiable.
2. Semi - HPCR disconnect switch required to be located at left end of bumper. Switch must be easily accessible and identifiable.
This rule does not eliminate the required 3-way fuel bypass valve located in fuel supply system before the high pressure pump

12.5 - Truck General: Engine¶

All pulling vehicles must be required to have a steel plate or billet flywheel. The flywheel must be made of steel with the following mechanical properties: tensile strength of 60,000 PSI and yield strength of 40,000 PSI. Any aluminum or magnesium flywheel that meets or exceeds SFI specs will be acceptable.
Any truck with engine-driven fan blade is required to have a fan shroud of 1/16-inch minimum steel, 360 degrees around the blade. Shroud shall be no more than one (1) inch from radiator core and one (1) inch past rear blade.
All exhausts must discharge vertically or underneath and straight back.
Only one (1) automotive type engine per vehicle.
No electronic fuel injectors or metering devices will be allowed. Except Diesel 4x4 classes that have a factory computer.

12.6 - Truck General: Driveline / Drive Shielding¶

No computers allowed that automatically control any mechanical operation of the competing engine, clutch or vehicle except for water injection. A vehicle must have three (3) round metal loops per drive shaft.
360-degree loop must be a minimum of 3/8-inch aluminum or 5/16-inch steel, 3/4-inch-wide (or wider) and not more than 2 inches from the shaft in any direction.
End loops to be placed no farther than six (6) inches from universal covers, with third loop in center of shaft.
Must use a solid tube (3/8-inch aluminum or 5/16-inch steel) to meet the above requirements.
If planetary reductions at wheel are used, the following drive shaft shielding criteria will apply.
1. No cast metals.
2. All remaining drive train, excluding additional manual transmissions, must be enclosed in 5/16-inch minimum steel or 3/8-inch aluminum, round, inside diameter not to exceed two (2) inches more than the outside diameter of the largest universal joint, fastened every six (6) inches or closer, with 3/8 inch or larger bolts, grade #5 or butt and seam welded and securely mounted to vehicle’s frame. Applies to all vehicles with exposed drive shaft. No more than ¼ inch of the end of driveline shall be visible with driveline shielding in place.
3. Drive shafts between engine and transfer case must have solid shielding a minimum of 3/8-inch aluminum or 5/16-inch steel.
4. Vehicle must have 360-degree metal shield around the universal joints, 3/8-inch aluminum or 5/16-inch steel, minimum width six (6) inches. Joint should not be visible from side, top or bottom.
5. May use solid tube (3/8-inch aluminum or 5/16-inch steel) to meet the above requirements.
No counterbalances permitted in driveline.
No cam type rear-ends. All rear ends must be welded or bolted solid to the frame with a minimum of 3 bolts per side.
The intermediate shaft on FWD driveline shield components must be tethered using the rules stated in the Driveline / Driveline Shielding rules in the General Rules section.
FWD drivelines that use driveshaft hoops must use tether configuration stated in the Driveline / Driveline Shielding rules in the General Rules section to be attached to main or common hoop holder between chassis and hoop assembly.
If a split shield design is used, mount as in Rule 12.5.b above.

12.7 - Truck General: Weights / Wheels¶

No dual wheels, chains or studded tires allowed. All tires must have rubber or rubber compound contact between tire and pulling surface.
Axle and hub bolt shield are required, except where planetary final drives are used.
1. Shield must be at least 0.060 inches thick.
Minimum diameter of axle end or hub bolts to be covered on both front and rear axles.
Mounting shield cannot be mounted to axle end or hub bolts.
A hole may be installed in center of front shield, so a lock can be operated, so long as hub end or axle bolts are covered.

12.8 - Truck General: Fuel & Water¶

VP Racing Fuels are mandatory for all truck classes.
VGM water is the only injected water that is allowed.