Unlimited open wheel vehicles with limited engine.

DEFINITION

Unlimited 4 wheel single and two seat vehicles with a limited engine.

No production bodied vehicles allowed in this class.

GENERAL REGULATIONS

Entrants in this class shall comply with all applicable general regulations.

TECHNICAL REGULATIONS

This class is an open class and all components will be considered open unless restricted herein.

NOTE: The TR abbreviations listed under this class (I.E. TR1 HELMETS) refer to TR cross reference listings in the front of this book. These TR cross-referenced listings are part of the class rules. Where a conflict occurs between the TR cross-referenced listing and a rule contained under this class, the rule contained under this class takes priority.

SAFETY EQUIPMENT

TR1 HELMETS

See TR1 in Car/Truck/Moto Technical Rules.

TR2 PROTECTIVE CLOTHING

See TR2 in Car/Truck/Moto Technical Rules.

TR3 EYE PROTECTION and DENTURES

See TR3 in Car/Truck/Moto Technical Rules.

TR4 HEAD AND NECK RESTRAINTS

See TR4 in Car/Truck/Moto Technical Rules.

TR5 FIRST AID KIT

See TR5 in Car/Truck/Moto Technical Rules.

TR6 EMERGENCY SIGNALING DEVICES

See TR6 in Car/Truck/Moto Technical Rules.

TR7 HORNS

See TR7 in Car/Truck/Moto Technical Rules.

TR8 REFLECTORS

See TR8 in Car/Truck/Moto Technical Rules.

TR9 FIRE SUPPRESSION EQUIPMENT

See TR9 in Car/Truck/Moto Technical Rules.

TR10 SURVIVAL SUPPLIES

See TR10 in Car/Truck/Moto Technical Rules.

SUSPENSION COMPONENTS

TR11 SHOCK ABSORBERS and BUMP STOPS

See TR11 in Car/Truck/Moto Technical Rules.

TR12 SECONDARY SUSPENSION

See TR12 in Car/Truck/Moto Technical Rules.

TR13 WHEELS and TIRES

See TR13 in Car/Truck/Moto Technical Rules.

TR14 FASTENERS

See TR14 in Car/Truck/Moto Technical Rules.

STEERING and BRAKE COMPONENTS

TR15 STEERING

See TR15 in Car/Truck/Moto Technical Rules.

TR16 BRAKES

See TR16 in Car/Truck/Moto Technical Rules.

ELECTRICAL SYSTEM

TR17 IGNITION

See TR17 in Car/Truck/Moto Technical Rules.

TR18 BATTERIES

See TR18 in Car/Truck/Moto Technical Rules.

TR19 LIGHTS

See TR19 in Car/Truck/Moto Technical Rules.

TR20 STARTERS

See TR20 in Car/Truck/Moto Technical Rules.

FUEL SYSTEM

TR21 FUEL

See TR21 in Car/Truck/Moto Technical Rules.

TR22 FUEL TANKS

Fuel cell mandatory.

TR23 FUEL FILLERS LINES, VENTS, and CAPS

See TR23 in Car/Truck/Moto Technical Rules.

ENGINE, TRANSMISSION and DRIVELINES

TR24 ENGINE and ENGINE DISPLACEMENT

Any engine may be used providing:

1. It is a design that has been series produced in quantities of 5,000 units or more and is readily available to the general public in the U.S.A.
2. It did not displace more than 2500cc in the stock form.
3. It retains a maximum of four (4) valves per cylinder. Has no more than four (4) cylinders.
4. Single seat vehicles must not displace more than:
   1. 1800cc water-cooled eight valve with a single two-barrel carburetor.
   2. 1750cc water-cooled sixteen valve with a single two-barrel carburetor or stock fuel injection. Max throttle body size 58.5mm.
   3. 2200cc four cylinder, push rod, air cooled with one (1) or two (2) carburetors, or stock fuel injection.
   4. Stock production GM Eco-Tech engine. 2.2L, 2.4L or 2.5L. Engine must be sealed by an approved American Off-Road Racing Championship engine builder.
   5. Ford 2.0L 14-DI-TIVCT engine. Engine must be sealed by an approved American Off-Road Racing Championship engine builder.
   6. 2.4L Sealed Honda Engine Sealed by Approved Engine Sealer. Restricted to K24A block, and RBB intake and cylinder heads. Any wet sump oil pan.
5. Two seat vehicles must not displace more than:
   1. 1900cc water-cooled eight valve with a single two-barrel carburetor.
   2. 1850 water-cooled sixteen valve with a single two-barrel carburetor or stock fuel injection. Max throttle body size 58.5mm.
   3. 2400cc four cylinder, push rod, air cooled with one (1) or two (2) carburetors, or stock fuel injection.
   4. Stock production GM Eco-Tech engine. 2.2L, 2.4L or 2.5L. Engine must be sealed by an approved American Off-Road Racing Championship engine builder.
   5. Ford 2.0L 14-DI-TIVCT engine. Engine must be sealed by an approved American Off-Road Racing Championship engine builder.
   6. 2.4L Sealed Honda Engine Sealed by Approved Engine Sealer. Restricted to K24A block, and RBB intake and cylinder heads. Any wet sump oil pan.
6. It is not a rotary-piston engine.

Single and two seat vehicles may use one carburetor providing:

1. It retains a maximum of two (2) ventures per carburetor.
2. Maximum allowable venturi size is 40mm.
3. Carburetor(s) must be of the production automotive type.
4. Four cylinder, push rod, air cooled motors may use two (2) carburetors.

Fuel injection is stock with the following restrictions:

1. Intake manifold must remain as delivered by the manufacture. It will retain it’s stock shape, size, and configuration. No porting or other modifications. Ports may be matched to heads, but matching may not exceed .250 inches (1/4 inch) deep. Manifold must be the unit that was installed and delivered on the engine by the original manufacture. Only U.S.A. delivery fuel injection is allowed. Manifold must be installed and sold on production vehicles that are sold for highway use in the U.S.A. and be readily available to the general public.
2. Throttle body must be production (OEM) type readily available to the general public in the U.S.A.

If American Off-Road Racing Championship at anytime during the racing season determines that any particular brand or make of engine has an advantage, we may equalize that engine either by a reduction in cc’s or the use of a restrictor. These changes may be required during the racing season.

TR25 ENGINE REPLACEMENT

See TR25 in Car/Truck/Moto Technical Rules.

TR26 TRANSMISSION/DIFFERENTIAL

See TR26 in Car/Truck/Moto Technical Rules.

TR27 THROTTLES

See TR27 in Car/Truck/Moto Technical Rules.

TR28 EXHAUST

See TR28 in Car/Truck/Moto Technical Rules.

TR29 DRIVE SHAFTS

See TR29 in Car/Truck/Moto Technical Rules.

TR30 FLYWHEEL SHIELDS

See TR30 in Car/Truck/Moto Technical Rules.

TR31 FLUID COOLERS

See TR31 in Car/Truck/Moto Technical Rules.

TR32 AUXILIARY EQUIPMENT

See TR32 in Car/Truck/Moto Technical Rules.

TR33 SUPERCHARGERS and TURBOCHARGERS

See TR33 in Car/Truck/Moto Technical Rules.

VEHICLE SAFETY EQUIPMENT

TR34 ROLL CAGES

See TR34 in Car/Truck/Moto Technical Rules.

TR35 SAFETY HARNESS

See TR35 in Car/Truck/Moto Technical Rules.

TR36 SAFETY NETS

See TR36 in Car/Truck/Moto Technical Rules.

TR37 SEATING

See TR37 in Car/Truck/Moto Technical Rules.

GENERAL VEHICLE COMPONENTS

TR38 DRIVERS COMPARTMENT

See TR38 in Car/Truck/Moto Technical Rules.

TR39 DOORS AND LATCHES

See TR39 in Car/Truck/Moto Technical Rules.

TR40 FIREWALLS

See TR40 in Car/Truck/Moto Technical Rules.

TR41 BALLAST

See TR41 in Car/Truck/Moto Technical Rules.

TR42 WEIGHT

See TR42 in Car/Truck/Moto Technical Rules.

TR43 FLOORBOARDS

See TR43 in Car/Truck/Moto Technical Rules.

TR44 BUMPERS and HAZARDOUS PROTRUSIONS

See TR44 in Car/Truck/Moto Technical Rules.

TR45 MIRRORS

See TR45 in Car/Truck/Moto Technical Rules.

TR46 SKID PLATES

See TR46 in Car/Truck/Moto Technical Rules.

TR47 STORAGE

See TR47 in Car/Truck/Moto Technical Rules.

TR48 CHASSIS and BODY

No production bodied vehicles allowed in this class.

TR49 HOSES

See TR49 in Car/Truck/Moto Technical Rules.

TR50 IDENTIFICATION MARKINGS

See TR50 in Car/Truck/Moto Technical Rules.

TR51 ADVERTISING on VEHICLES

See TR51 in Car/Truck/Moto Technical Rules.

TR52 RADIO EQUIPMENT

See TR52 in Car/Truck/Moto Technical Rules.

TR53 WORKMANSHIP

See TR53 in Car/Truck/Moto Technical Rules.

TR54 TRACKING DEVICE

See TR54 in Car/Truck/Moto Technical Rules.