Section 7 - Winged Sprintcars

Please refer to section 3 - MINIMUM SPECIFICATIONS
{wieght adjustment pending - per NSRA annual)

17.1   Engine Specifications
17.1.1 CID - Maximum cubic inch displacement is 360.0 ±1%.
17.1.2 Blocks - Aluminum blocks are allowed provided the car meets the minimum weight rule.
17.1.3 Rods - No titanium rods or crankshaft allowed. A method of inspecting rods and crankshaft is required. It is recommended that an inspection plug be put in the oil pan consisting of a one-inch pipe plug.
17.1.4 Injectors - Injectors will not be more than 2,187 inches in diameter. If down sized stacks or a restrictor is used, there must be at least three (3) inches of restriction starting at the bottom of the injector stack tube.
17.1.5 Nozzles - Injection nozzles in heads are permitted. A maximum of sixteen (16) injection nozzles are allowed. NO blowers, superchargers, or nitrous oxide allowed. 17.1.6    Heads - No #12 heads
17.1.7 GM - All General Motor heads must have 23° ±2°-valve angles.
17.1.8 Ford and Mopar - All ford and Mopar heads must be stock per factory production +1- 2°.
17.1.9 NOTE: The valve angle and injection size may be checked at the time the engine is pumped.
17.1.10         Compliance - Engines may be pumped for size and cars may be weighed for compliance at any time at the discretion of the Race Director.
17.1.11         Sealing Engines - Engines may be sealed by a technical official. After being pumped for size to eliminate the need for pumping at subsequent events by drilling two head bolts side-by-side.

17.2   FUEL AND FUEL SYSTEMS
17.2.1 Fuel - Fuel must be alcohol only with no performance enhancing additives of any kind or nitrous oxide.
17.2.2 Fuel Shutoff - All cars must be equipped with 1/4 turn fuel shutoff in driver's compartment within easy reach, fuel shutoff must be clearly marked as to "on" and "off' positions. It is recommended that the valve be accessible from the outside of the car. 17.2.3      Fuel Cells - The manufacturer for their intended use must approve fuel cells and/or bladders. They must be enclosed in a container constructed of steel, aluminum, or fiberglass of a minimum .063 thickness, or other approved sprint car tail tank.
17.2.4 Supporting the Fuel - It is highly recommended that the fuel tank have an adequate supporting structure under the forward section of the lowest portion of the tank. This structure should follow the contour of the tank and be welded or securely attached to the frame of the car on each side.
17.2.5 Mounting the Fuel Cell - When mounting the fuel tank to the chassis, all mounting points must have inner and outer plates attached to the shell. These plates must be of adequate size to insure the tank being secure to the chassis. All tanks must have a minimum of four mounts to the chassis.
17.2.6 Fuel Cell Cap - A flush-type cap is mandatory. The top access cover must be installed in direct contact with the fuel cell.
17.2.7 Tank Vent - The tank vent must have a check valve.
17.2.8 Below the Fuel Cell - The lower portion of the tail directly under the fuel tank must be louvered or left open to allow fuel to escape if the tank is ruptured.

17.3   CAR CONSTRUCTION
17.3.1 Size - The wheelbase must be at least 84 inches and no more than 90 inches . The overall length will be limited to a maximum of 14 feet . The overall width will . be limited to a maximum width of 78 inches from the outside left front or rear tire to the outside of right front or rear tire. The tread must be at least 47 inches center to center. 17.3.2       Weight - All cars must weigh a minimum of 1650 pounds with the driver. Any ballast used must be securely bolted within the confines of the frame tubes no farther than 16" forward of the front engine mount and no further rearward than the drivers seat. All ballast must be painted white and clearly marked with the car number. Minimum car weight rule must be met at all times.
17.3.3 Off Set - The maximum chassis offset allowed, for both front and rear wheels is four (4) inches ( 8 inches overall) measured to the inner wheel bead seat.
17.3.3.1                  The outside of the right rear wheel at the outside bead seat of the wheel cannot exceed 43 inches from the centerline of the rear axle center section.
17.3.3.2                  The outside of the left rear wheel at the outside bead seat of the wheel can not be less than 31 inches from the centerline of the rear axle center section.
17.3.3.3                  The outside of the right front wheel can not be more than 43 inches from the centerline of the chassis.

17.4    Four Wheel Drive - No four-wheel drive cars will be allowed.

17.5    Weight Jackers - Driver-adjustable suspension and/or weight jackers will not be allowed inside or outside of the cockpit.

17.6    Anti-Roll Bars - Anti-roll bars will not be allowed.

17.7    Cockpit Opening - The cockpit opening must be at least five hundred (500) square inches, located directly behind the engine compartment and measured on a plane parallel to the ground and level with the uppermost part of the body or windscreen. The front part of the body, known as the nose assembly, shall not be wider than the parallel lines of the body, may not exceed the width of the frame of the car and must have a minimum of 58 square inches of forward facing opening. The nose assembly may not extend forward beyond the confines of the front bumper.

17.8    Air Deflectors - Any air deflector that is used to direct air for cooling shall be completely inside the confines of the nose and the solid sides of the nose shall cover this deflector. This deflector will not be moveable.

17.9    Oil Tanks - Oil tanks, water radiators, oil coolers and any remote engine accessories or forward facing scoops must be within the confines of the mainframe tubes. Oil tanks mounted forward of the firewall must be behind the front axle and forward of the front engine mounting plate. Oil tanks mounted behind the engine plate/firewall may be mounted outside the main frame providing they do not protrude more than eight (8) inches from the mainframe tubes. For the purpose of this rule the frame tube will be considered a straight line between the front and rear attachment point. Cylindrical oil tanks mounted outside the frame, behind the engine plate/firewall, must be mounted as close to the frame as practical.

17.10  No water radiators or oil coolers are to be placed above or besides the cockpit opening.

17.11  Chassis Centerline - The engine driveline and rear axle center section must be mounted on the chassis centerline. The engine must be mounted in a vertical position. A maximum of one degree from vertical and 1 /2-inch offset from center will be allowed. The driver shall be seated directly behind the engine and on the centerline of the chassis. The tail tank and the car's bodywork must be on the centerline of the chassis.

17.12  Cockpit - A suitable guard must shield all revolving parts inside the cockpit. Open drive shafts must have adequate restraining loops fore and aft. These restraints should be a minimum of one (1) inch tubing or equivalent materials. The U-joints must have shields of a minimum 1/8-inch steel or aluminum.
17.12.1                   Torque Arms - Torque arms located within the driver's compartment must be restrained with safety loops of adequate strength.
17.12.2                   Torsion Bars - Chassis using front torsion bars May not have the bar tubes below the horizontal centerline of the front spindles.

17.13  Engine Cowling - The engine must be covered with a cowling or hood secured in place. The hood or cowling need not enclose the sides of the engine.

17.14  Floorboards/Under Pan - All cars must have a floorboard or under-pan, utilizing aluminum or equivalent alloy, under the cockpit area. The under-pan should extend from the engine plate to a point six (6) inches past the leading edge of the seat.
17.14.1                   Under Pan Specifications - Under pans may not extend rearward past the leading edge of the rear axle. Under pans or floorboards must be bolted to the chassis in the cockpit area.The under-pan or car bottom must be flat from side to side without any aerodynamic aids. Horizontal panels must not extend below the plane of the under pan. It is recommended that under-pans be constructed of aluminum or equivalent alloy, extending from the front of the engine to the rear engine plate. It is recommended that a fireproof absorbent pad be used under the engine.

17.15  Car Body Design - Body panels rigidly attached to the frame to prevent chassis flex will not be permitted. All body panels must be readily removable. Right side cockpit panels may be a maximum of thirty-six (36) inches high as measured from the top of the bottom mainframe tubes at the engine plate and projected rearward. Any hood or cowl panels higher than thirty-six (36) inches from the top of the bottom main frame tube may not extend rearward past a point twenty-eight (28) inches forward of the rear vertical (or more forward) roll cage tube. Side panes cannot extend rearward past the rear diagonal roll cage tube or brace, single panel sail panels between the rear cage upright and brace are allowed.

17.16  Spill Plates - Vertical spill plates may be used on the outer edges of the hood and can be a maximum of 2 1/2 inches in height. The outside dimensions of these spill plates cannot be wider than 24 inches at the front and 30 inches at the rear of the hood. Sun visors are limited to seven inches from the top to bottom including any tabs, extensions, etc. and cannot be wider than the cage. Sun visors cannot extend above the cage.

17.17  Roll Cage - All cars must have a roll cage, which is integral with the frame and does not encroach upon an imaginary cylinder, 20 inches in diameter, extending through the top cockpit opening. The roll cage must be adequately braced fore and aft, and side to side, to secure it in an upright position in case of rollover. The roll cage should extend four inches above the driver s helmet when he/she is seated in the driving position. All roll cages must be constructed of SAE 4130 seamless tubing with a minimum O.D. 1 3/8" and minimum wall thickness of .095. The roll cage must be gusseted in all four corners. For all new construction, gussets must be tubular and attached a minimum of 2 inches from the centerline of the angle being gusseted. Material must be a minimum of 11/16" O.D. x .095 wall thickness or 7/8" O.D. x .065 wall thickness.

17.18  Nerf Bars - All cars must be equipped with rear wheel nerf-bars. The right rear nerf bar can not extend beyond the outside edge of the tire. Nell bars must be constructed from SAE 4130 alloy tubing or equivalent having an O.D. of one (1) inch, a minimum wall thickness of .065 inch and a maximum wall thickness of .120 inch . A maximum of three horizontal and/or three vertical tubes are allowed in the construction of nerf-bars. No ballast is allowed in the nerf-bar tubing. With the exception if the exhaust system, no components or accessories may be attached to the nerf bar assembly.

17.19   BUMPERS
17.19.1         Rear Bumper - All cars must have an adequate rear bumper for push starting. 17.19.2          Front Bumper - All cars must be equipped with a front bumper. No part of the car may extend beyond the front bumper.

17.20 STEERING AND SUSPENSION
17.20.1         Engineering - The steering mechanism must be engineered and assembled in accordance with sound engineering principles.
17.20.2         Design - All highly stressed steering parts must be made from SAE 4130 steel or an alloy, specified by the manufacturer of the part as equivalent in necessary strength for its intended use.
17.20.3         Heat Treating - All such parts must be heat treated (including stress relieving, normalizing, annealing and hardening when applicable) after forming and/or welding as recommended by the manufacturer of the alloy being used.
17.20.4         Brazing/Soldering - Parts may not be joined by brazing, soldering or by dissimilar metals.
17.20.5         Electroplated Parts - All steering parts that are electroplated must be oven baked at a temperature of 375° Fahrenheit ±2° for a period of not less than three (3) hours after plating.
17.20.6         Parts Stripped of Plating - Parts that have been stripped of plating must also. be baked according to the specifications in Item (5), unless the parts are to be reprocessed within a three (3) hour period.
17.20.7         Shot Peening - Shot peening is recommended for all highly stressed parts. Authorized facilities should be used.
17.20.8         Steering Wheel - The steering wheel hub must be padded with a resilient material or not less than three-fourths (3/4) inch thickness. Removable steering wheels incorporating a quick release mechanism are mandatory. Pip pin type mechanisms are not allowed
17.20.9         Steering Link Strap - The use of an approved steering link strap is recommended.

17.21  Traction Control Devices - No traction control devices of any kind will be allowed, mechanical or electronic. All MSD boxes/coils will be mounted on the engine side of the firewall and all wiring associated with these devices will not enter the driver's compartment at all. At the discretion of the Race Director the magneto of a suspicious car will be pulled off and sent in for testing by a professional. Meridian Speedway or one of its car owners will provide a magneto to the suspect car owner while the testing is being done. If it tests negative for traction control devices, Meridian Speedway will pay for the testing. If it tests positive for traction control devices the owner will pay for testing, pay back any purse monies received for the season to date and loses all points earned from Meridian Speedway previously in that season before he will be allowed to compete again with Meridian Speedway.

17.22 AXLES
17.22.1General - Independent suspension is not permitted. The car's axles connecting the wheels must be of one-piece tubular construction without the capability of camber adjustment to the wheel assembly. Any other construction will be considered as independent suspension. The rear end gear assembly must be of conventional design with only one set of spur gears located behind the ring and pinion.
17.22.2         Spools - Axle spools attached by the coping method must have the axle wrap around the spool at least two thirds of the spool diameter. Gusset plates are recommended on all spools.
17.22.3         Front Axle - All front axles must be constructed of SAE 4130 steel or a steel alloy equivalent in structural strength. Titanium front axles are not permitted.
17.22.4         Spindles and Hubs - Steel front spindles and hubs are recommended. Steel or one (1) inch aluminum torsion bar arms and stops are recommended for the right front suspension. Any car using a lug-nut type right front hub must use all six lug nuts. A 360-degree pressure plate of either 1/8-inch steel or 3/16-inch aluminum must be used between the lug nuts and the wheel face.

17.23 BRAKES
17.23.1         General - All cars must be equipped with a foot operable braking device to stop all wheels.
17.23.2         Master Cylinder and Brake Lines - Master cylinders not fixed to the frame must have flexible lines. Copper tubing is not allowed anywhere in the braking system.
17.23.3         Loss of Brake During an Event - If at any time during a competition it becomes evident that a car is without brakes the necessary repair must be completed before the car can continue in the competition.

17.24 WING
17.24.1         Total Area - Maximum Top Wing Area 3600 sq. in. Maximum Front Wing Area 1300 sq. in.
17.24.2         Dimensions - All Meridian Speedway Sprint cars' wings will meet the following specifications: Maximum length or width of 72" and cannot extend outside of the rear tire/wheel assemblies. Top wing sideboard height will be a maximum of 30". No wing rear lip (wicker bill) will exceed 1" in height. All stages of multi-stage wings will be measured in a straight-line method and added together for a total wing area. All wing assemblies must be securely attached to the chassis of the car.
17.24.3         Obstruction of View - Sitting in the car's seat, the driver must have a minimum 135-degree of unobstructed vision on each side for a total 270 degrees. This rule pertains to all wing (airfoils) attached to the bodywork and free standing.
17.24.4         Rear Wing - Airfoils mounted to suspension components will not be permitted. The top wing may not extend more than 36" beyond the centerline of the rear axle. 17.24.5 Wing Adjustment - No Wing adjustment devices in the cockpit allowed. Manual solid mounts only. 

17.25 EXHAUST SYSTEM
17.25.1         General - The angle of exhaust shall be parallel with the ground and must deflect the exhaust and heat so that it will be diverted from cars and drivers following.
17.25.2         Muffler - A muffling device will be required. All cars must meet local speedway DBA requirements or they will not be allowed to compete. DBA reading will be 95 or less as measured at start-finish line from 100 feet .

17.26 MISCELLANEOUS
17.26.1         Ignition - All cars must be equipped with an ignition switch located within easy reach of the driver and clearly marked "on" and "off'.
17.26.2         Throttle - Throttle toe straps are mandatory. In addition, a minimum of three (3) return springs must be connected to different locations on the throttle system. One spring must be on the butterfly shaft. If the throttle mechanism is the cable type, the cables must be encased to insure push-pull action. The throttle pedal must have a wide-open pedal stop.
17.26.3         Violations - Proof of any willful violation of Section VII -Car Specifications will result in loss of points and money for that program.
17.26.4         Non-Conformance - Non-conforming vehicles may be allowed to compete on a race-by-race basis at the discretion of the Technical Official with approval of the Race Director. However, if correctable at the track with equipment on hand before the event, the vehicle will be made to conform to Meridian Speedway rules according to Car Specifications, Section VII of this Rule Book.

17.27 WHEEL SPECIFICATIONS
17.27.1         Total Number - The number of wheels allowed is restricted to two (2) front wheels and two (2) rear wheels only on each car.
17.27.2         Rims - Wheel rim width is limited to a maximum of twenty (20) inches, measured between the outer bead seats of the rim. The right rear wheel rim must have a safety bead or some form of tire bead locking device on the outer bead seat of the tire and wheel assembly (NSRA mandatory rule, Meridian Speedway is optional). The rim diameter must be at least 15" and all wheels must meet with the official's approval. 17.27.3     Approval - The manufacturer must approve all wheels utilized for racing. Standard production steel passenger car wheels will not be permitted. Fabricated and/or split rim wheels must have the specific approval of the Meridian Speedway Tech Officials or Race Director.

17.28 TIRE SPECIFICATIONS
17.28.1         Altering - Tires must run exactly as they are manufactured. No soaking, sipping or grooving is allowed.
17.28.2         Recaps - No recapping of any tire will be allowed.
17.28.3         Tires - All tires will be marked before the start of qualifying and you must run that same tires during Main event. During the Main event, if you change the Right rear tire after the original green flag you will be put to the back of the full field of cars and be placed one lap down. However, if the tire was damaged by a crash or debris, and if Meridian Speedway Tech Official or Race Director approves, you can change that tire but must start at the rear of the field. Any tire damage caused by an accident prior to the push off of the main event may be changed with Meridian Speedway Tech Officials or Race Director’s approval and no penalty. Tire replacement will be a used tire, no new sticker or scuffed tire allowed.