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<Procedure, Inspection and Safety Rules> <2008 Body Diagram> 2008 Official Car Rules 2008 Late Model Rules
Open to American automobiles provided they comply with, and adhere to specifications as outlined for this division.
TWO WAY RADIOS WILL NOT BE PERMITTED
Approved Competition Models
WORLD Dirt Racing League races are open to eligible American made passenger car production sedans.
The following are the only approved models eligible for competition:
Chevrolet Camaro, Monte Carlo, Impala SS
Dodge Charger Intrepid
Ford Mustang Taurus or Fusion
Pontiac GTO Grand Prix
Toyota Camry
Section 4 Car Bodies The car body must be acceptable to Series Officials and meet the following requirements:
A. Aftermarket bodies and trim parts will be permitted but must be acceptable to Series Officials. A weight penalty may be added for non-approved bodies.
B. Under pans will not be permitted. Cars must remain stock appearing.
C. All cars must have complete bodies, hoods, fenders, bumpers and nose assemblies in top quality condition. When installing the bodies on the frames, a maximum distance of 52 inches will be permitted from the leading edge of the front bumper to the centerline of the front spindle. A maximum of 52 inches will be permitted when measuring diagonally from the centerline of the rear axle to the top rear of the quarter panel. A maximum of 46 inches will be permitted when measuring from the centerline of the rear axle on a parallel line back to the quarter panel. (See body diagrams at rear of book)
D. Glass windshields will not permitted.
E. All doors must be fastened in a secure manner.
F. Fenders may not be cut or altered except for wheel or tire clearance.
G. The floors must be complete in the driver's compartment, and the floor must be made of metal not less than 19 gauge (.040 thick). The floor pan, front, rear, left, and right firewalls (Cockpit Tub) in the driver’s compartment, especially from the driver’s seat forward and up a minimum of six (6) inches in front of the driver’s feet should be made of minimum 1/8-inch thick metal. It may be either aluminum or steel.
H. A maximum of (1) stone deflector, for rear mounted oil pumps, oil filters, and for the main oil tank will be permitted. The deflector maybe made of steel, aluminum, heavy gauge wire, or plastic. The cover may only be mounted near the unit it is designed to protect with a maximum size of eighteen inches square (18"x18") and mounted only from the upper right frame rail to the lower right frame rail.
Section 4-1 Dash Panel All cars must have a dash panel acceptable to approval by Series Officials.
Section 4-2 Firewall A. All cars must have full fire-walls made of metal.
B. All fire-walls must be completely sealed.
Section 4-3 Doors Door panels must maintain a maximum of 33 inches when measured from the bottom of the panel, including any skirting up to the bottom of the window opening.
Section 4-4 Fenders, Quarter Panels, and Rocker Panels
The fenders, quarter panels, and rocker panels must be acceptable to Series Officials and meet the following requirements:
A. A maximum of 38 inches will be permitted when measured from the ground to the top of the rear quarter panel at the rear bumper.
B. The front fender can be a maximum of 37 inches in height. The measurement is from the ground to the top of the fender behind the front tires.
Section 4-5 Rear Deck Lids/Trunks
A. The rear deck area must not be lower than the rear quarter panels.
B. The fuel cell compartment firewall must be constructed of metal, and approved by the WORLD Dirt Racing League officials.
Section 4-6 Hoods A. The hood must maintain the original configuration.
B. The hood must have positive fasteners, right side, left side, front and rear.
C. It is permissible to cut a hole in the hood for the carburetor air cleaner. The hole may be a maximum of one (1) inch larger in diameter than the air cleaner used.
D. Holes for cooling the engine will not be permitted. The maximum length of the hood will be 58 inches.
E. The front of the hood of the car must maintain a minimum height of 26 inches.
Section 4-7 Roofs and Roof Posts A. All competing models will be required to have a full roof on their car. No half roofs permitted. Minimum roof size will be 44 inches long by 48 inches wide. Maximum roof size will be 54 inches long and 52 inches wide. Roof must be stock appearing and should be of aluminum, or fiberglass, but must be rounded and if it’s aluminum it must have a minimum 1inch lip on each side. No wings or spoilers permitted in the roof. No recessed roofs permitted. Must be on a minimum of a flat plane.
B. All competing models will be required to have front roof posts, minimum of 1 inch wide, up to maximum of 2 inches wide. Rear roof posts (sail panels) must be fastened to the outside of the rear quarter panel and may be a maximum of 17 inches at the top and a maximum of 43 inches long at the base. The base of the sail panels must not extend past the front or leading edge of the spoiler braces. The rear roof panels must be alike in size, shape and design. (If one has opera window, both must have it) A maximum of 2 inch bow outward on the rear roof posts (sail panels) will be permitted.
C. It is recommended that all cars have an emergency roof hatch in the roof over the drivers head.
D. The minimum roof height, measured from the ground must be a minimum of 45 inches, with the maximum roof height being 48 inches. The roof may not have more than 1-1/2 inches difference in height from either the front or rear to the center.
Section 4-8 Front Nose Panels The front nose panel and/or header panels must be mounted in a manner acceptable to Series Officials.
A. All nose panels will be required to be approved production manufactured nose panels.
B. The bottom or sides of nose panels must not be cut or altered in any way.
C. The nose panel must be mounted so that the bottom is parallel to the ground.
D. All nose panels will be permitted a minimum ground clearance of four (4") inches.
E. Nose panels will be permitted to have side panels to be mounted over tires but must be made of flexible
material and must not extend past the front tires more than four (4") inches on either side. They will be required to be securely fastened and to taper back into the front fenders of the car.
F. The minimum heights permitted of all nose panels will be seventeen (17") inches.
G. All competing models should have a tow cable or chain mounted on the front of the car. If a cable is used, it should be a minimum of 3/8 inch cable.
The approved nose panels for 2008 are as follows. Chevrolet Camaro, Monte Carlo, Impala SS
Pontiac GTO Grand Prix
Ford Mustang Fusion Taurus
Dodge Charger Intrepid
Toyota Camry
Section 4-9 Windshield/Windscreen A. All competing models should use a screen in front of the driver acceptable to Series Officials.
B. All competing models will be required to use four (4) solid vertical bars in conjunction with the screen (minimum 1/4 inch in diameter). Section 4-10 Rear Spoilers A. A solid non-adjustable rear spoiler of clear polycarbonate or metal must be attached at the rear of the deck lid. Rudders, side spoilers or side windows will not be permitted.
B. A maximum of three (3) triangular braces may be installed in front of the spoiler for support. Spoiler braces must not protrude above the spoiler and may be a maximum of 18 inches in length. C. All cars will be permitted to use a rear spoiler not exceeding eight (8) inches in height and not more than 72 inches in width, and must be attached to and centered on the rear of the car. D. Straps that are no wider than 1" may be used if more than 3 spoiler braces are needed. Section 4-11 Rear Window The rear window opening cannot have glass of any kind in it.
Section 4-12 Side Window Glass A. All side window glass must be removed. A seven (7) inches high by seven (7) inches long aluminum or lexan vent-type window may be installed in each door window opening. B. The vent window must be attached to the windshield post and the top of the door panel. (No other glass, aluminum, or lexan permitted in window openings)
Section 4-13 Head and Neck Restraints, Window Nets or Arm Restraints Head and neck restraints, arm restraints or an approved nylon mesh screen in the left side driver's window is highly recommended. The window net, when in the closed position, should fit tight and be secured with a quick-release type latch at the top. Section 4-14 Ground Clearance requirements A. The frame rail and sheet metal clearance must be a minimum of four (4) inches. B. The front air dam clearance must be a minimum of four (4) inches. Section 4-15 Car Height Adjustment Devices
A. Mechanical devices for adjusting the car's height, which can be activated by the driver, will not be permitted inside of the driver's compartment. B. Hydraulic weight shifting devices will not be permitted at any time. C. Electrical, pneumatic, hydraulic or remote control devices, which change the handling characteristics or height of the car will not be permitted. D. The only chassis adjusting device permitted within the driver's compartment will be for adjusting brakes. Section 5 Rear View Mirror: The rear view mirror must not extend outside of the car. The maximum size of the rear view mirror must be three (3) inches by five (5) inches. Section 6 Wheelbase Requirements
The minimum average wheelbase permitted will be 103 inches. NOTE: The wheelbase will be checked as follows. The drivers (left) side will be set at 103 inches, then the right side will be checked without moving the steering wheel. Section 7 Overall Car Weight
All specified minimum weight requirements will be measured with the driver after the race.
A. All competing models must maintain a minimum weight requirement of 2,300 pounds after the race with the driver, unless using one of the engine combinations listed below in this section.
B. There will be a (25) twenty-five pound reduction in the minimum weight required for races of 50 laps or less.
C. There will be a (50) fifty-pound reduction in the minimum weight required for races longer than 50 laps.
D. All competing models using a maximum 360 cubic inch engine with un-ported steel cylinder heads that have a valve angle within one (1) degree of Original Equipment Manufactured cylinder heads and a steel engine block will be required to weigh 2200 pounds after race with the driver.
E. Competing models using a 360 cubic inch or smaller engine with approved aluminum un-ported cylinder heads that have a valve angle within 1 degree of Original Equipment Manufactured heads and has an approved stamp on the cylinder heads and in the roof and floor of the intake runners and the roof of the exhaust ports and a steel engine block will be required to maintain a minimum weight of 2200 pounds after race with the driver.
Section 7-1 Added Car Weight A. Added weight must be in block form of not less than five (5) pound blocks (no pellets). B. Added weight must be securely bolted in place.
C. Fluids of any type or dislodged weight will not be permitted to be added to the car after the race. D. Weight will not be permitted to be attached to the rear bumper. E. Stacking of weights will not be permitted. All weights will be required to be bolted in with a minimum of (2) two good grade ½ inch bolts. It will be required that all bolts used to mount weights and the weights be painted white with your car number on it. F. Weight will not be permitted to be mounted above the interior of the car or inside of the drivers compartment. Section 8 Steering Components The car steering components must be acceptable to Series Officials and meet the following requirements:
A. Rack and pinion steering will be permitted.
B. All cars must be equipped with an approved steering shaft.
C. The center top of the steering post and spokes should be padded with at least two (2) inches of resilient material.
D. A quick release metal coupling on the steering wheel is mandatory. The use of universal joints in the steering shaft must be acceptable to Series Officials.
Section 9 Engine Rules Engines may be interchanged within any manufacturer's line. It is mandatory that all engine blocks be produced by the manufacturer for sale to the public in a regular product offering.
Section 9-1 Engine Location A. All competing models using an engine that is 360 cubic inches or smaller may be mounted so the number 1 spark plug is located 8 inches behind the center of the upper ball joints.
B. All competing models using an engine that is larger than 360 cubic inches must be mounted so the number 1 spark plug is located 6 inches behind the center of the upper ball joints.
C. All engines with un-ported steel cylinder heads that have a valve angle within 1 degree of Original Equipment Manufactured cylinder heads, and a steel engine block may be mounted so the number 1 spark plug is located 10 inches behind the center of the upper ball joints.
D. Engines with approved aluminum un-ported cylinder heads that have a valve angle within 1 degree of Original Equipment Manufactured cylinder heads and has an approved stamp on the cylinder heads and in roof and floor of the intake runners and the roof of the exhaust ports and a steel engine block may be mounted so the number 1 spark plug is located 10 inches behind the center of the upper ball joints.
Section 9-2 Engine Displacement A. Any size engine may be used.
B. There will be weight breaks given to engines up to 360 cubic inches using un-ported steel cylinder heads or approved aluminum un-ported cylinder heads that have a valve angle within 1 degree of Original Equipment Manufactured heads and has an approved stamp on the cylinder heads and in the roof and floor of the intake runners and the roof of the exhaust ports and a steel engine block. Section 9-3 Engine Block Approval and Changing: A. All engine blocks must be approved by Series Officials.
B. Engines and engine blocks may be changed during the nights events, but must be approved by series officials. Section 9-4 Crankshaft A. Only magnetic steel crankshafts acceptable to Series officials will be permitted. The stroke may be increased or decreased.
B. Crankshafts may be lightened and balanced. The stroke may be increased or decreased.
Section 9-5 Connecting Rods Only magnetic steel connecting rods may be used. No titanium connecting rods permitted.
Section 9-6 Oil Pans and Oil Coolers Oil pans and oil coolers must be acceptable to Series Officials and meet the requirements that follows: Oil pans must be made of magnetic steel or aluminum. Engine oil coolers must be oil to air or an oil to water heat exchanger mounted adjacent to the engine. The oil cooler intake mounted above the interior sheet metal must not be larger than five (5) inches in height and 10 inches in width. The outside edges of the oil cooler must be completely sealed with sheet metal.
Section 9-7 Cylinder Head/s All cylinder heads must be approved and all modifications must be submitted to Series Officials before any proposed modifications will be eligible for competition. Approved manufacturers identification and part numbers must remain on the part being used in competition.
A. Any competing model using a maximum 360 cubic inch engine with un-ported steel cylinder heads with a steel engine block will be eligible for a weight break. (See Section 7, paragraph D.)
B. Competing models using a 360 cubic inch or smaller engine with approved aluminum un-ported cylinder heads that have a valve angle within 1 degree of Original Equipment Manufactured heads and has an approved stamp on the cylinder heads and in the roof and floor of the intake runners and the roof of the exhaust ports and a steel engine block will be eligible for a weight break. (See Section 7 Paragraph E)
Section 9-8 Cylinder head Eligibility To be eligible, the cylinder heads must be acceptable to Series Officials and meet the following requirements:
A. There is a limit of two (2) valves per cylinder.
B. There are no valve size restrictions.
C. Aluminum high performance cylinder heads approved by Series Officials will be permitted.
Section 9-9 External Changes External modifications will be permitted providing the external doesn’t change the valve configuration.
Section 9-10 Camshaft and Valve Lifters
A. Any magnetic steel camshaft may be used or roller camshaft will be permitted. The camshaft may be gear driven.
B. Solid magnetic steel or magnetic steel hydraulic flat tappet straight barrel valve lifters will be permitted.
C. Roller tappets, mushroom valve lifters and any type of mechanical assistance exerting a force to assist in closing the Valve and/or push rod, commonly known as rev-kits will be permitted.
Section 9-11 Rocker Arms and Valve covers Any rocker arm that is standard on the approved engine being used and roller bearing rocker arms acceptable to Series Officials may be used. Any type Rocker arm assembly may be used.
A. Valve covers must be made of metal.
Section 9-12 Intake Manifold The intake manifold must be approved and be acceptable to Series Officials. Hi-ram intake manifolds will not be permitted.
Section 9-13 Eligibility Requirements The floor of the intake manifold between the intake runners must have a single plane, smooth, unaltered surface.
Section 9-14 Modifications Permitted Polishing or enlarging of the portholes in the intake manifold will be permitted.
Section 10 Carburetor Any approved two or four barrel carburetor may be used.
Section 10-1 Carburetor Spacer A maximum 2 inch thick spacer/s may be installed between the intake manifold and the carburetor. Any open or four (4) hole spacer/s may be used. The outside configuration of the spacer must conform to the base of the carburetor.
Section 10-2 Fuel Injection or Supercharger Fuel injection, superchargers, and turbo-chargers will not be permitted.
Section 11 Air Cleaner and Air Cleaner Scoops A. Only a round dry type paper air filter element maintaining a minimum of 12 inches and a maximum of 17 inches in diameter will be permitted. The air filter element must maintain a minimum 1-1/2 inches and a maximum five (5) inches in height. All air must be filtered through the air filter element.
B. Only a round metal air filter housing will be permitted. The top and bottom of the air filter housing must be solid.
C. Tubes, funnels, or any device which may control the flow of air will not be permitted inside of the air cleaner or between the air filter housing and the carburetor.
D. Air Cleaner scoops will be permitted, but must be positioned in front of or around the air cleaner. The air cleaner scoop cannot exceed more than one(1) inch above the air cleaner. The scoop cannot extend more than twenty (20) inches forward of the air cleaner. The scoop cannot be designed with fins or raised edges with the intent to direct the air flow into the carburetor. The scoop cannot extend behind the rear of the air cleaner and will be permitted to have a maximum width at the rear of twenty (20) inches and a maximum opening at the front of ten (10) inches in width and one (1) inch in height.
Section 12 Oiling System
A Dry sump oiling system may be used, but must be acceptable to Series Officials. The lubrication oil reservoir location and installation must be acceptable to Series Officials. Dry sump reservoir tanks will not be permitted in the driver's compartment or behind the rear axle, unless it is mounted between the frame rails of the car.
Section 13 Engine Exhaust System The exhaust systems must be acceptable to Series Officials and meet the following requirements.
Section 13-1 Headers The exhaust manifold used will be optional with the exception of 180-degree headers, which will not be permitted.
Section 13-2 Collectors and mufflers All cars will be required to have collector pipes welded to the exhaust headers and extend beyond the bell housing.
A. When required by the racetrack all competing models must use mufflers acceptable to Series Officials that meet the sound requirement of 98 DBA maximum at 100 feet.
B. When mufflers are required, all cars not having approved mufflers may be accessed a 50 pound weight penalty.
Section 14 Suspension A. All suspension components must be reinforced.
B. All suspension systems and parts must be acceptable to Series Officials and meet the following requirements.
Section 14-1 Rear Springs Any approved rear suspension will be permitted.
Section 14-2 Coil Over Front Suspension A. Coil over suspension will be permitted.
B. Strut bars will not be permitted for mounting of the coil overs.
Section 14-3 Sway Bars A. The sway bars must be acceptable to Series Officials.
B. The sway bars may be reinforced. Additional sway bars will be permitted.
Section 14-4 Shock Absorbers The shock absorbers must be acceptable to Series Officials and meet the following requirements:
A. Heavy duty shock absorbers may be used.
B. Only one (1) shock absorber per wheel will be permitted, with the exception of the rear.
C. Remote or electronically controlled shock absorbers will not be permitted.
Section 14-5 A-Frames The A-frames must be acceptable to Series Officials and meet the following requirements:
A. A-frames must have a stock appearance.
B. Upper and lower A-frames may be altered for tire clearance.
C. The distance from the centerline of the tread width, front and rear, to the mounting points of the lower A-frames, left and right, must be within one (1) inch.
D. A-Frame front suspension is mandatory. No Straight axles permitted. Section 14-6 Spindles and Hubs: The spindles, wheel bearings, and hubs must be acceptable to Series Officials and meet the following requirements: A. Heavy duty steel or aluminum spindles will be mandatory.
B. Aluminum hubs will be permitted.
Section 14-7 Brakes: A. Magnetic steel rotors must be used. NO titanium or carbon fiber rotors will be permitted.
B. Any material may be used for brake pads.
C. All cars will be required to have 4 wheel operational brakes at all times.
Section 15 Ignition System and Electrical System A. All ignition systems must be acceptable to Series Officials.
B. Electronic distributors' will be permitted that are equipped with a magnetic pickup, gear driven, and mounted in the stock location.
C. Only (1) live ignition coil will be permitted.
D. Only (1) live electronic firing module will be permitted.
E. Computerized, programmable, or multi-coil dual electronic ignition boxes will not be permitted.
F. Adjustable timing controls will not be permitted.
G. Retard or ignition delays will not be permitted.
H. Accessories to regulate the power supply will not be permitted.
I. A heavy wire (positive to the battery) and a heavy wire (negative to the ground) will be permitted. Other wires will not be permitted to enter or exit the amplifier box.
J. Magneto systems will be permitted.
K. Crank triggered ignition systems will be permitted.
L. Distributors must be mounted in original mounting position for the make and model of engine being used.
Section 15-1 Starter The self-starter must be in working order.
Section 15-2 Battery A. The battery location and mounting must be approved by Series Officials.
B. Battery cannot be mounted in drivers compartment.
C. Battery should be mounted ahead of the fuel cell and must be mounted so there is a fire wall between the battery and the drivers compartment.
D. The battery should be located between the frame rails of the car.
Section 15-3 Electrical Switch Locations All electrical switches must be located on the dashboard panel, within the drivers reach.
Section 15-4 Accessories A. Cars and drivers will not be permitted to carry onboard computers, micro-controllers, processors, recording devices, electronic memory chips, or traction control devices.
B. Remote lap timing or speed sensing devices (radar guns) will not be permitted.
C. Analog or digital gauges may be used, but if using digital gauges they will be subject to removal and inspection by Series officials at any time.
Section 16 Fuel Specifications A. Gasoline as fuel only, with the exception of engines with a maximum of 360 cubic inches and un-ported steel cylinder heads or approved aluminum un-ported cylinder heads with an approved stamp on the cylinder heads and in the roof and floor of the intake runners and the roof of the exhaust ports and have a valve angle within 1 degree of original equipment manufactured and a steel engine block as outlined in Section 7, paragraph D and E.
B. The gasoline must not be blended with alcohols, ethers or other oxygenates and it shall not be blended with aniline or its derivatives, nitro compounds or other nitrogen additives.
C. Icing or cooling of the fuel system will not be permitted in the pits or on the racetrack.
D. All competing models using an engine with a maximum of 360 cubic inches, un-ported steel cylinder heads and a steel engine block, as described in (Section 7, paragraph D) may use either gasoline or alcohol for fuel.
E. Competing models using a 360 cubic inch or smaller engine with aluminum un-ported cylinder heads that have a valve angle within 1 degree of original equipment manufactured cylinder heads and have an approved stamp on the cylinder heads and in the roof and floor of the intake runners and the roof of the exhaust ports with a steel engine block, may use either gasoline or alcohol as fuel. (Section 7 paragraph E) For more information on what is considered a legal stamp contact the WORLD Dirt Racing League Technical Director (Mark Ludwig).
Section 16-1 Fuel System Fuel cell vent pipe check valves are mandatory. Check valves and the fuel cell must be acceptable to Series Officials. Pressure systems will not be permitted. Any concealed pressure type containers, feed lines or actuating mechanisms will not be permitted, even if inoperable. Icing, freon type chemicals or refrigerants must not be used in or near the fuel system.
Section 16-2 Fuel Pump The fuel pump must be acceptable to Series Officials and meet the following requirements:
A. Electric fuel pumps will not be permitted.
B. Only mechanical fuel pumps mounted to the engine block or belt-driven fuel pumps will be permitted.
C. Cooling of the fuel or fuel pump will not be permitted.
Section 16-3 Fuel Cell The use of a commercially manufactured fuel cell acceptable to Series Officials is mandatory. The fuel cell must meet the following requirements:
A. The fuel cell capacity is a maximum of 32 gallons.
B. Materials other than the standard foam, as provided by an approved fuel cell manufacturer, will not be permitted.
C. Fuel cell check valve is required and must be acceptable to Series Officials. All fuel cells must be equipped with an approved steel ball or a flapper valve fuel filler and an approved fuel vent check valve assembly.
Section 16-4 Fuel Cell Container The use of a fuel cell container acceptable to Series Officials is mandatory. The fuel cell container must meet the following requirements:
A. The fuel cell must be encased in a metal container and mounted with either 2 inch by 1/4 inch flat straps or 1 inch by 1 inch square tubing around fuel cell container.
B. Fuel cell container must be mounted between the frame rails of the car.
Section 16-5 Fuel Filler and Fuel Cap: All competing models will be required to have an approved check valve in the fuel cell filler.
Section 16-6 Fuel pickup and Fuel line A. Fuel pickup should come out of the top of the fuel cell.
B. Only (1) one fuel line from the fuel cell to the engine will be permitted.
C. Fuel line must be approved by Series Officials and cannot be routed through the drivers compartment.
Section 17 Frames All frames must be acceptable to Series Officials. Any frame rejected by the Series Officials will not be approved until necessary corrections have been made.
Section 17-1 General Frame Eligibility A. All frame components must be made of magnetic steel and welded.
B. Frames must be made of a minimum of 2 inch by 2 inch square tubing or 1 3/4 inch round tubing.
Section 18 Clutch The clutch and clutch assembly must be acceptable to Series Officials and meet the following requirements.
A. Clutch must be operable and the driver must be able to start the car and put it in forward and reverse gears.
Section 19 Flywheel Any steel or aluminum flywheel acceptable to Series Officials will be permitted.
Section 20 Bell Housing The bell housing must be acceptable to Series Officials and meet the following requirements:
A. Special production all-steel clutch housings will be permitted.
B. Special production aluminum bell housings will be permitted.
Section 21 Transmission The transmission must be acceptable to Series Officials and meet the following requirements:
A. Two (2) forward gears and reverse gear must be in working order.
B. Three (3) and four (4) speed transmissions will be permitted.
C. Automatic or semi-automatic transmissions will not be permitted.
D. Quick change transmissions will not be permitted.
Section 22 Drive Shaft The drive shaft must be acceptable to Series Officials and meet the following requirements:
A. The drive shaft, universal joints, and yokes must be similar in design to the standard production type.
B. The minimum diameter permitted of the drive shaft is two inches.
C. All drive shafts must be painted white.
D. All competing models must have a drive shaft safety hoop made of at least 1/4 by 2" flat steel and must be approved by series officials.
E. A second drive shaft safety hoop made of at least 1/4 inch by 2 inch is highly recommended.
Section 23 Engine Cooling System The engine cooling system must be acceptable to Series Officials. Icing, Freon type chemicals or refrigerants must not be used in or near the engine compartment. Portable cooling machines or devices will not be permitted.
Section 23-1 Water Pump A. Only mechanical water pumps in the stock location, turning in the same direction of crankshaft rotation, will be permitted.
B. Water pump impellers may be altered.
C. Coolant flow must be in the same direction as the Production engine.
Section 23-2 Fan The engine cooling fan must be acceptable to Series Officials and meet the following requirements:
A. Electric engine cooling fans will not be permitted.
B. Engine driven fans must be operational and belt driven from the crankshaft. Free spin or clutch type fans will not be permitted.
C. The installation and location of the fan must be acceptable to Series Officials.
Section 23-3 Radiator The engine cooling radiator must be acceptable to Series Officials and meet the following requirements:
A. The radiator must remain stock appearing and remain in front of the engine.
B. Radiator dust screens will be permitted.
C. Radiator installation must be acceptable to Series Officials.
D. The radiator overflow pipe may be relocated.
Section 24 Rear Axle The rear axle must be acceptable to Series Officials and meet the following requirements:
A. Quick change center section will be permitted.
B. Full floating rear axles are mandatory.
C. Differential oil coolers must be acceptable to Series Officials.
D. Only steel or aluminum axle housings will be permitted.
E. Cambered rear axle housings will not be permitted.
Section 25 Wheels A. All wheels must be 15 inches in diameter and a maximum of 14 inches wide with five (5) lug bolts.
B. Only reinforced magnetic steel or aluminum wheels will be permitted.
C. Heavy duty full threaded magnetic steel lug bolts may be used.
D. Heavy Duty magnetic steel or aluminum lug nuts may be used.
E. Bead locks will be permitted on all four (4) wheels. Foam or disc type wheel covers will be permitted.
Section 26 Tread Width Requirements The rear tread width must not be wider than the front tread width. (Left side and right side)
Section 27 Tires Only approved tires will be permitted. Approved tires are those tires that comply with the requirements listed below.
Unless otherwise listed on the pre race entry blank or notified on race day, the legal tire for all WORLD Dirt Racing League events in 2008 will be the Hoosier WRS or WRS-2 D-55, 88.0/11-15, 90.0/11-15, 92.0/11-15 or D-55 spec tire only. For information on identification markings on tires check pre entries on the web site or call the WORLD Dirt Racing League office.
Section 27-1 Physical Requirements To be named on each entry blank.
Section 27-2 Tire Manufacturer Obligations A. The tire identification markings must be unique to all sizes, construction, and rubber compound combination.
B. The same tires must be made available to all competitors.
Section 27-3 Tire Measurement Procedure To be determined by Series Officials.
Section 27-4 Tire Usage Rules The following rules govern the use of approved and qualified tires:
A. Should identification numbers, or serial numbers be defaced on any tire, this tire will be ruled ineligible for competition.
B. Tires that, in the judgment of Series Officials, have been altered by unauthorized treatment will not be permitted.
C. Tires may be grooved and siped. D. No softening will be permitted.
E. Any tire found to be softened will be confiscated by the WORLD Dirt Racing League officials.
Section 28 Roll Bars
A. Unless otherwise specified below, all roll bars must be made from round magnetic steel seamless tubing, minimum 1-1/2 inches by 0.090-inch minimum meeting ASTM A-519 specifications.
B. Electric resistance welded tubing; aluminum and/or other soft metals will not be permitted. Roll bar joints and intersections must be welded according to ASTM specifications for the material being welded.
C. All roll bars within the driver's reach must be padded, Padding acceptable to Series Officials.
D. Padding must be mounted so it does not change the configuration of the round tubing roll bars.
E. Additions to the roll cage for the purpose of trying to make the car more aerodynamic will NOT be permitted.
F. It is strongly recommended that all competing models have a vent window bar in the drivers door. The bar should be a minimum of 1-½ inches in diameter and must be mounted to the left front upright bar and to the top door bar. The vent window bar can be mounted no further than 6 inches from the top halo bar and must be acceptable to Series Officials.
Section 29 Decals A. To be eligible for any sponsors rewards, you must display their decals on both sides of your race cars.
B. No corporate sponsor cards may be used by race participants, team members, friends or relatives of participants. Email technical questions to Mark Ludwig at: markludwig@wdrl.net
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