2008 CHAMPIONSHIP SPRINTS

TABLE OF CONTENTS
Article 2: Chassis
Article 3: Bodies
Article 4: Engine
Article 5: Weight Rule
Article 6: Brakes
Article 7: Wheels
Article 8: Tires
Article 9: Fuel Tanks/Fuel
Article 10: Suspension Components
Article 11: Wings
Article 12: Bolts
Article 13: Bumpers & Nerf Bars
Article 14: Front Axles
Article 15: Floor Pan
Article 16: Carbon Fiber
Article 17: Titanium Components
Article 18: Listening Device
Article 19: Suggested Safety Rules

ARTICLE 2: CHASSIS
(a) Any sprint chassis is allowed, but it must pass any test prescribed by the safety inspectors. The safety inspectors have the right to deny any car from competition if they deem it is not safe for competition.
(b) No Champ Cars allowed.
(c) The roll cage must be a four-post design. No elliptical tubing used on or as part of the main frame structure.
(d) A drive shaft hoop or strap is mandatory.
(e) Wheelbase no less than 83 inches and no more than 90 inches. No additional anti-roll/weight transfer bars.

ARTICLE 3: BODIES
(a) All cars will be required to run a full sprint appearing hood.
(b) Hood must extend to the front torsion bar tubes or a similar location on coil over cars.
(c) Hood may be a multiple piece design, but must appear to be one (1) continuous piece.
(d) Rock guard and side panels will be allowed.

ARTICLE 4: ENGINE
(a) OPTION #1 (Steel Blocks ONLY):
(i) Maximum displacement of (360) cubic inches. (1)% allowance for tubing.
(ii) Steel Heads: Offset rocker arms with a maximum of (.200) offset allowed.
(iii) USRA BRODIX Spec Head: SPCH, SPFO or SPMO. Repaired spec heads must be recertified by BRODIX.
(iv) ASCS Spec Head: #27-211, #27-233 or #27-222. Must comply with ASCS head rule.
(v) USRA reserves the right to implement stack restrictors based on competition.
(vi) Fuel Injection: Fuel Injection will have a maximum bore of 2 3/16. If sleeved down, sleeves must be at least 3in. long and measure 2 3/16 throughout. No down nozzles. Only one nozzle per cylinder. Butterfly and shaft models only. No side plate or rotary barrels. No engine or cylinder head claims. Zoomie headers not allowed.

(b) OPTION # 2:
(i) USRA Generation IV E-98 6.2L Sprint Car Engine. For more information on the Sealed Engine approved for USRA Championship Sprint Car competition. Tracks and USRA officials will have computer boxes for random rotation.

ARTICLE 5: WEIGHT RULE
(a) All cars must weight a minimum of 1,500 lbs. with driver after race.
(b) Any added weight must be mounted with at least two (2) 1/2-inch diameter grade (8) bolts, painted white and have car number painted on it.
(c) All bolt-on weight must be between front and rear axles and between top and bottom frame rails, and must remain on car during the entire event. Cars not meeting these specifications will be disqualified.

ARTICLE 6: BRAKES
(a) Steel, aluminum, carbon fiber or titanium brake rotors allowed.
(b) Steel brake lines only.

ARTICLE 7: WHEELS
(a) No dual wheels allowed.
(b) No carbon fiber or plastic wheels allowed.

ARTICLE 8: TIRES
*****Tire Rule modifications (5/2/08)
We have decided to allow the Hoosier SC-25 on the right rear on a trial basis as an option. (The MD-50 will also still be allowed)
Left rear tire may be any brand, but must durometer 40 or harder.
Fronts will be open to any brand of sprint car tire.
*****Tire Rule modifications (5/2/08)
(a) Right Rear: American Racer MD62 with “USRA” or “NMRA” stamp.
(b) Left Rear: American Racer SD44 with “USRA” or “NMRA” stamp.
(c) All front tires must be American Racer.
(d) No softening of any tires allowed.

ARTICLE 9: FUEL TANKS/FUEL
(a) All fuel tanks must have a bladder.
(b) Fuel tanks must be securely fastened. Any means of mounting the tank must meet the approval of the officials.
(c) Fuel cells cannot be altered or modified and must be one-piece construction of cross-link polyethylene plastic.
(d) A 33-gallon fuel cell is HIGHLY RECOMMENDED.
(e) Tank used for qualifying must remain for all events.
(f) Methanol or Ethanol fuel only.
(g) No performance enhancing additives allowed.

ARTICLE 10: SUSPENSION COMPONENTS
(a) Tie rods/drag links may utilize 4130 steel or aluminum at least 1-inch in diameter and a minimum wall thickness of .058 inch and must use solid steel bolts and steel heims.
(b) Drag link strap will be mandatory.
(c) Drive lines must be fully enclosed by a torque tube. No open drive lines.
(d) No traction control devices allowed.
(e) No driver controlled hydraulic adjustment devices of any kind allowed.

ARTICLE 11: WINGS
(a) TOP WING:
(i) Center Foil maximum size of 25 square feet with a maximum width of 60 inches. Center Foil must be square or rectangular in shape with all 4 corners set at 90 degree angles with one (1) degree variance allowed.
(ii) Center Foil shall be fully sheathed in aluminum. Vent holes are strictly prohibited.
(iii) No wicker bills or Gurney lips permitted on Center Foil. Flat Wing Option: Wings with flat (no belly/curl/arc) Center foils may utilize a 1” wickerbill / turnup on the trailing edge of the center foil.
(iv) Other than the slider mechanism, no moving parts allowed on or in foil structure.
(v) The 12-inch section located at the rear of the Center Foil must not have the belly/curl arc out of proportion with the rest of the Center Foil. The belly/curl arc must span the entire length of the Center Foil and appear to be a gradual arc with the deepest point no further back than 48 inches from the leading edge. As measured on a 12-inch straight edge, the belly at 6 inches from the rear of the Foil may not be deeper than ½ inch. There is zero tolerance on this 1/2-inch depth. It is suggested that the wing blue print specify 15/32-inch depth, so that if any deflection or movement of the wing occurs, the depth will not exceed the ½ inch specification. This 1/2-inch measurement ensures that the belly/curl arc is gradual.
(vi) The belly/curl arc must start at the radius of the Center Foil’s leading edge and shall not exceed a depth of 2½ inches. Center Foil thickness cannot exceed 9 inches. Flat Wing Option: Wings with no belly/curl/arc may have a Center Foil thickness of 11 inches. Center Foil top surface from side to side must remain flat. Center Foil must be one-piece construction. No split or bi-wings will be permitted. Wings must be fabricated of metal alloys only. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wings. Top wing must not extend beyond outside of rear tires.
(vii) Two stationary foils or rudders will be allowed to run the entire length of the underneath portion of the top wing. Maximum height proportions are 1 inch at the front and 3 inches at the rear. Nowhere shall the foil exceed 3 inches in height.

(b) FRONT WING:
(i) Center Foil maximum size of 6 square feet with a maximum width of 36 inches.
(ii) Center Foil shall be fully sheathed in aluminum. No vent holes allowed.
(iii) No wicker bills or Gurney lips permitted on Center Foil. Flat Wing Option: 1 inch wickerbill.
(iv) Maximum distance from the Center Foil front edge to the front edge of the front axle may not exceed 20 inches.
(v) The Center Foil front edge must remain at least 1 inch behind the front edge of the front bumper. Center Foil top surface from side to side must remain flat.
(vi) Center Foil must be one piece. No split or bi-wings will be allowed.
(vii) Wings must be fabricated of metal alloys only. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wings.
(viii) The Front Wing must not extend beyond outside of front tires. The Front Wing may not be cockpit or driver adjustable while the car is stationary or in motion.
(ix) No moving parts allowed on or in foil structure.
(x) The 5-inch section located at the rear of the front foil must not have a bell/curl arc that is out of proportion with the rest of the front foil. As measured on a 5-inch straight edge, the belly at 2½ inches from the rear of the foil may not be deeper than 3/8 inch. There is zero tolerance on this 3/8-inch depth. It is suggested that the wing blue print specify 11/32- inch depth, so that if any deflection or movement of the wing occurs, the depth will not exceed the 3/8-inch specification (this 3/8 inch measurement ensures that the belly/curl arc is gradual.
(xi) The belly/curl arc must span the entire length of the front foil and appear to be a gradual arc with the deepest point, no further back than 12 inches from the leading edge. The belly/curl arc must start at the front foil’s leading edge and shall not exceed a depth of 2 inches. Top foil thickness cannot exceed 3.6 inches (5 inches for flat Center Foils).
(xii) No rudders or fins on Front Wings.

(c) SIDE PANELS:
(i) Side Panels may not be supported by braces whose section is not horizontal. All braces or supports shall be oriented thin edge to face the air stream. Only rectangular, round or oval metal braces not exceeding 1 inch in width may be used.
(ii) No aero section Side Panel brace material allowed.
(iii) No brace or support shall resemble a wicker bill or a split wing.
(iv) Top Wing sideboards maximum size, 72 inches long and 30 inches tall. The top 2/3 of each top wing side panel shall consist of only 2 corners. Each corner shall be set at a 90-degree angle with no more than an 8 degree variance. This portion of the side panel’s leading edge cannot be behind the Center Foil's leading edge. Panels may not measure more than 84 inches on a diagonal measurement from all outside corners. Panels must be of one-piece construction. Panels must be fabricated flat so as to have no turnouts or flaps made of more than 2 inches of material on the front or rear of panel and no more than 1 1/4 inches on the top or bottom. Panels must be mounted parallel and square to the center foil with no more then 2½ inches of turnout as measured from the Center Foil.

(d) Wing Sliders are not allowed.

ARTICLE 12: BOLTS
(a) No hollow or drilled out bolts allowed on the drag link or tie rod.
(b) Drag link and tie rod bolts must be solid steel.
(c) No aluminum bolts.

ARTICLE 13: BUMPERS & NERF BARS
(a) All rear bumpers and nerf bars must be steel and hollow.
(b) No weight of any kind added to or inside of bumpers or nerfbars.
(c) Minimum 1 inch in diameter with minimum .065-inch thickness.
(d) Rear bumpers must be on at all times during the race.
(e) No car will be allowed to compete without a rear bumper.
(f) Front bumper maximum length is 8 inches.

ARTICLE 14: FRONT AXLES
(a) Steel only.
(b) Minimum size 2 inches x .156 inch or 2¼ inches x .120 inch or 2 3/8 inches x .095 inch.

ARTICLE 15: FLOOR PAN
(a) Steel or aluminum only.

ARTICLE 16: CARBON FIBER
(a) Except for brake rotors, no carbon fiber parts allowed in the suspension or drive line.
(b) No carbon fiber hoods, nose pieces or fuel tanks.
(c) No carbon fiber sleeves or seats allowed.

ARTICLE 17: TITANIUM COMPONENTS
(a) No titanium drivelines allowed.

ARTICLE 18: LISTENING DEVICE
(a) The RACEceiver Elite 1600 will be mandatory. Channel must be 454.000 only.

ARTICLE 19: SUGGESTED SAFETY RULES
(a) SEATBELTS: Seatbelts should have the five or six point configuration of attachment to the frame or roll cage. The shoulder belts should be attached about waist high behind the seat to the frame or roll cage (cannot be attached to seat or fuel tank). Arm restraints are also suggested. The USRA reserves the right to withdraw any car from competition that it deems to have an unsafe seat and/or poorly mounted seat belts.
(b) DRIVER’S EQUIPMENT: The driver’s suit should be of multi-layered Nomex. Nomex underwear, socks and head sock are suggested. Driving gloves and racing shoes are strongly suggested. No alterations. Helmets must be Snell SA2000 or SA2005. The USRA reserves the right to inspect any helmet for cracks or structural damage and reject same if necessary.
(c) CAR’S EQUIPMENT: Use a securely fastened steering wheel with a quick disconnect and removable steering wheel. No Aluminum roll cages, front axles, frames, rear bumpers or nerf bars. All roll cages must be higher than the driver’s helmet. Opening on left hand side of cockpit must be a minimum of (14) inches. No pop rivets or cotter keys to be used to fasten wings, bumpers or nerf bars to race car. Only two (2) valves and one (1) spark plug per cylinder allowed. No titanium crankshafts or rods will be allowed. You cannot race without a hood. If you lose a rear bumper you may continue the race unless the car is stopped. If a red flag occurs you must replace the bumper in the allotted time before you can restart. A triangular safety net is suggested on the right side of the roll cage. Metal fasteners are strongly suggested. Left side net is suggested.
(d) ROCK SCREEN: Required. If a competitor does not have a rock screen, he must have one installed before the next night.
(e) MISCELLANEOUS: Neck collars are HIGHLY RECOMMENDED. Knee pads or other devices to keep the knees from banging around on objects causing injuries are HIGHLY RECOMMENDED. Shoulder/helmet restraints are also RECOMMENDED. A padded head rest and roll cage padding around the cranial area is HIGHLY RECOMMENDED. A type of styrofoam or fiberglass insulation of 1 inch thick with an upholstery type covering is RECOMMENDED. If you use armafax or foam rubber, it should be considerably thicker.