REVISED 2008 RULES DENOTED IN RED, BOLD, ITALIC TEXT

410 Sprint Car Rules & Specifications

General

1. A sprint car is defined as a racing vehicle of single seat design, built upon a racing chassis and mounted on four (4) racing wheels.
2. No rear engine cars or aluminum frames allowed.
3. Driver’s compartment shall be separate from the engine by a firewall of suitable material.
4. All cars must weigh a minimum of 1,375 pounds with driver following the completion of any event. There will be NO bolt on weight permitted. If a car fails to go directly to the scales when required to do so, that car will be disqualified.

Bodies

1. No carbon fiber hoods, nose pieces or seats allowed.
2. The body should give the appearance of completely covering the car’s frame and should be fully painted.
3. The hood or cowling need not enclose the sides of the engine.
4. One piece tail and fuel tanks are allowed, but must be streamlined.
5. No side foils, rudders or panels are to extend beyond roll cage on any side, no body pieces to extend beyond or underneath front torsion tube except hood.
6. Floor pans must be either aluminum or steel.

Engines & Heads

1. No carbon fiber intake manifolds, cylinder sleeves, oil pans, injector stacks or injectors allowed.
2. The engine shall not exceed 410 cubic inches. A random cylinder will be pumped to verify the cubic inch limit.
3. Double overhead cam engines, Dart or Buick heads are not permitted.
4. No turbine driven, turbos or blowers, and no offset motors are allowed.
5. No titanium crankshafts will be allowed.
6. No direct drives.
7. Only two (2) valves and one (1) spark plug per cylinder allowed.
8. No big blocks.
9. No computer operated or controlled parts such as fuel injections, fuel systems, chassis adjusting systems, data gathering systems, etc.
10. No traction control devices.
11. All engine cylinders must be machined from steel alloy only.
12. No Billet machined blocks or heads.

Roll Cage

1. Must provide maximum protection.
2. Gussets should be used in the drivers compartment.
3. The roll cage must be constructed high enough to cover the driver’s helmeted head.
4. Opening on left hand side of cockpit must be a minimum of 14 inches.
5. The drivers right side opening must be a minimum of 10 inch vertical opening at any point and a minimum 21 inch horizontal opening at any point.
6. A head rest or special high back racing seat is required.
7. Seats must be mounted to the frame with a minimum of three (3) 5/16 inch grade five bolts with 5/16 inch x 1-1/4 inch washers on the inside of the seat.
8. Windshield screens are highly recommended using a minimum of .090 screen.

Tires & Wheels

1. All right rear tires used must be a HOOSIER National Sprint spec tire, size 105/18-15. Any SC compound tire is permitted.
   • The same right rear tire must be used for the entire racing program including qualifying, heat and feature events.
   • Cars competing in the Consolation or B-Main may use a different tire for that event but must use their heat race tire for the feature.
   • Tire change between events results in car being moved to the rear of the starting line-up for the next race. Tire compound may be changed.
   • There will be a one time exemption per team for a tire change occurring after a qualifying event. The same compound must be used. When taking this exemption, a Lincoln Speedway official must be notified before the change.
   • The one tire per racing program rule will not be in effect for day shows.
2. Maximum wheel diameter is 15 inches.
3. Right rear wheel maximum width is 18 inches and left rear maximum is 15 1/4 inches.
4. No plastic wheels.
5. Wheel covers must be securely fastened.

Fuel & Tanks

1. Approved fuel bladders are required and there must be a solid cover over the bladder.
2. No oxygen bearing additives are allowed. No carbon fiber fuel tanks allowed.

1. No Titanium, only nerf bars and bumpers made of steel at least one-inch in diameter will be allowed.
2. Nerf bars, which offer adequate protection in the event of contact with another car, are mandatory.
3. Nerf bars must be bolted or roll pinned to the vehicle. No pop rivets may be used to fasten nerf bars, bumpers or wings. Nerf bars may not extend past outside of tires.
4. Maximum 8" front bumper or 23-1/2 inches from the center of the front axle to front of bumper.
5. Rear bumper minimum thickness of . 065".
6. Only steel front axles are allowed. Minimum sizes: 2" x .156, 2-1/4 x .120 or 2-3/8" x .095.
7. No front anti-roll bars are allowed.

 Top Wing Option #1

1. 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° angles with no variance allowed. Center foil top is to be flat from front to back and side to side.
   • Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges, etc. are strictly prohibited anywhere on the wing.
   • Maximum 1" removable wicker bill may be mounted on the rear edge of the center foil. Wicker bill must be 90 degrees to the top of the center foil. No built-in wicker bills or gurney lips allowed. Maximum dimension of wicker bill may change periodically.
   • The top wing can be cockpit/driver adjustable. Other than the slider mechanism, no moving parts permitted on or in foil structure. Only one slider mechanism allowed on top wing, allowing adjustment forward and backwards only.
   • Center foil thickness cannot exceed 9 inches. Underneath side of center foil must appear to be a continuous smooth arc with no recesses, concaves, or protrusions.
   • 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.
     No foils or rudders will be permitted anywhere on the top wing.

1. 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 no variance allowed.
   • Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges, etc. are strictly prohibited anywhere on the wing.
   • No wicker bills or Gurney lips permitted on Center Foil.
   • The top wing can be cockpit/driver adjustable. Other than the slider mechanism, no moving parts permitted on or in foil structure. Only one slider mechanism allowed on top wing, allowing forward and backwards movement only.
   • 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 ½ 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 ½ inch measurement ensures that the belly/curl arc is gradual.)
   • 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. 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. No car will be allowed to compete without a top wing.

1.1.2 Front Wing

1. Center Foil maximum size of 6 square feet with a maximum width of 36 inches. Center Foil must be square or rectangular in shape with all four corners set at 90° angles.
2. Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges, etc. are strictly prohibited anywhere on the wing.
3.  
4. Wicker bills or Gurney lips are permitted on Center Foil using a maximum 1" removable wicker bill that may be mounted on the rear edge of the center foil. Wicker bill must be 90 degrees to the top of the center foil. No built-in wicker bills or gurney lips allowed. Maximum dimension of wicker bill may change periodically.
5.  
6. Maximum distance from the Center Foil front edge to the front edge of the front axle may not exceed 20 inches.
7.  
8. 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.
9.  
10. Center Foil must be one piece. No split or bi-wings will be permitted.
11.  
12. 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.
13.  
14. 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.
15.  
16. No moving parts permitted on or in foil structure. No rudders or fins allowed.
17. The 5" section located at the rear of the front foil must not have a belly/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 2 ½ 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).
18. 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. Front foil thickness cannot exceed 3.6 inches.

1. 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.
2. No adjustable bracing allowed.
3. No aero elliptical brace material permitted.
4.  
5. No brace or support shall resemble a wicker bill or a split wing.
6. Side boards must be mounted square to the center foil and parallel to each other. No kick-out allowed.

1. Front side boards maximum 12 inches tall and 26 inches long with no more than one inch overhang from the center foil front edge to the side board front edge.
2. Side boards may have front, back, top and bottom turnouts of no more than ½ inch.

1. Top wing side boards maximum size, 72 inches long and 30 inches tall. The top 2/3’s of each top wing side panel shall consist of only 2 corners. Each corner shall be set at a 90° angle with no variance. This portion of the side panel’s leading edge cannot be behind the center foils leading edge.
2.  
3. Panels must be of one-piece construction.
4.  
5. Panels must be fabricated flat. Turnouts on all edges of the wing must not exceed 1-1/4" x 1-1/4" and must be orientated at a 90° angle to the flat portion of the side panel.

Hoods
Hoods are mandatory. No carbon fiber hoods. The rib may not extend higher than 2-1/4 inches.

Safety Restraints& Wear
The following safety equipment is required for the protection of the competitors. Enforcement of the following requirement to be done on a spot check basis to the best of the ability of speedway officials.

• Shoulder harness, lap belts, crotch belts and arm restraints are required.
• All drivers must wear flame retardant driving uniforms, minimum two (2) layers, and flame retardant gloves (it is recommended underwear, head sock, foot socks and shoes should also be flame retardant).
• Helmets must be SNEL approved and full face type.
• A right side quick release style roll cage net is required.
• Torque tube straps are also required.
• Seat fume deflector/heat shield is suggested.
• Drag link must be tethered to the frame with nylon webbing of at least 1 inch width.
• All teams must have in the rear of their transporter an easily accessable fire extingguisher of at least 2.5 gallons FFF or equivalent. Failure to have an operable fire extinguisher will result in a fine.