MARYSVILLE RACEWAY PARK
Wingless Sprint Car Series
General Rules, 2013 season
The Rules contained herein supersede any previously published safety and conduct rules. The rules set forth herein are designed to provide for the orderly conduct of racing events and establish minimum acceptable requirements for these events. These rules will govern the condition of all events and by participating in these events, the participants are deemed to have complied with these rules. No express or implied warranty of safety shall result from the publications of or compliance with these rules and/or regulations. They are intended as a guide for the conduct of the event. They are in no way a guarantee against injury or death to participant, spectator or official. The race director or promoter is empowered to impose or permit reasonable deviations from any specification herein or impose further restrictions that, in his opinion, do not alter the minimum requirements. No expressed or implied warranty of safety will result from such alterations of the specifications. Any interpretation or deviation of the rules is left to the discretion of the officials. The decision of the officials is final.
1. Open to any sprint car chassis.
2. Minimum cage structure to be no less than 1 3/8” O.D. with .095 minimum wall thickness. Cage MUST extend 2” above driver’s helmet. A halo bar will be required if driver’s helmet sits too high.
3. NO TITANIUM. NO EXCEPTIONS.
4. Motor, body, seat and fuel tank must be mounted to the centerline of the chassis.
5. Wheelbase minimum of 82”. Wheel base maximum of 96”.
6. All cars must weigh minimum 1650 lbs. with driver and all drivers’ equipment. You can be weighed at any time during the event. Driver must not exit cockpit prior to weigh in.
7. Bumpers and nerf bars will be constructed of no less than 1” O.D. and .60 wall thickness. Side nerf bars may have a triangular or 4 point configuration and may not extend outside rear tires.
8. Front bumper may be aluminum.
1. All drive trains must have a driveline or rear end coupler system (to disengage rear end from engine). Torque arm drivelines not allowed. All drivelines must be enclosed and have no more than 1 U-joint. That U-joint must be at the front of the driveline.
2. Buckley Yokes OK.
3. Torque tube safety strap or hoop mandatory.
4. Any conventional quick-change rear end is allowed with a maximum 2” offset.
1. Any conventional torsion bar or coil-over suspension is allowed. Combining the two is allowed.
2. No independent rear suspension allowed.
3. Straight front axle only.
4. One shock per wheel.
5. NO COCKPIT ADJUSTABLE SUSPENSION DEVICES. NO EXCEPTION.
WHEEL AND TIRES:
1. Any aluminum, or steel six-pin or spline wheel OK. Any wheel offset is allowed.
2. Maximum wheel width: front 10”, left rear 14”, right rear 18”.
3. Bead locks on all wheels recommended.
4. Hoosier 105 16/15 Med or Hard, this is the ASCS tire.
1. Minimum left front and left inboard rear brake system. Front and rear brakes must work at start of event. Rear brakes must work at ALL times. Additional right rear brake OK.
2. Steel, cast iron or aluminum rotors only. NO TITANIUM.
BODY/GENERAL APPEARANCE/AERODYNAMIC DEVICES:
1. Body/chassis must be well maintained. NO JUNK, PAINT OVER RUSTED HEADERS, ETC. Number must be legible and LARGE ENOUGH TO BE EASILY READ FROM THE SCORING BOOTH. NO EXCEPTIONS.
2. Numbers must be 1 or 2 digits (example: 012 - 09 or 1 - 99). Accepted letters will be X or XX ONLY. Suffixes may be added to denote differences in like car numbers. (i.e. 6 and 6x).
2. Conventional sprint car hoods allowed. Conventional side panels and tail tanks only.
3. NO AERODYNAMIC DEVICES ALLOWED. NO WINGS, WEDGES, FOILS, MODIFIED BELLY PANS (flat only) OR UNDERSIDE MODIFICATIONS. NO EXCEPTIONS. THE DECISION OF THE OFFICIALS WILL BE FINAL. No body part may be designed to trap air or otherwise form a windbreak, except those to cool or protect the engine or braking system.
4. Right side arm guard may not exceed 36” in height, measured from top of bottom frame rail.
5. Driver must be able to easily escape the car. Drivers will be asked to demonstrate this capability.
6. Firewall will be solid metal and fit between the engine and the driver. Access holes may be drilled for wiring and linkage.
7. Floor pan must extend from the firewall to the front of the driver’s seat.
8. Rock screen in front of driver mandatory.
1. A securely mounted fuel cell with bladder is required. Midget or sprint type is OK.
2. Minimum 25 gal. tank. Maximum of 40 gal.
3. Fuel tanks may not be mounted to the chassis utilizing any portion of the access plate or the nut plates bonded into the fuel bladder.
4. Mounting fuel tank of chassis: all mounting points must have inner and outer plates attached to the shell. The plates must be of adequate size to insure the tank being secure to the chassis. All tanks will have four different mounts to the cage.
5. Tank vent MUST have check valve.
6. Fuel systems must have shut off device within reach of the driver, marked in large bold block letters and painted a “Dayglow-Red” color for easy identification. A Waterman shut-off system is recommended for additional safety.
7. All fuel lines and filters will be securely and safely mounted to the satisfaction of the officials. NO EXCEPTIONS.
NO TITANIUM CRANKS, RODS, PISTONS OR ROTATING MASS. TITANIUM VALVES, SPRINGS AND RETAINERS OK.
1. 360 cu. in. plus 2%. 367.6 MAXIMUM. NO EXCEPTIONS PASS OR DON’T PASS RULE.
2. Cast iron block and heads required. Stock valve angle plus or minus 2 degrees (23 degrees for all GM motors).
3. Flat tappet cams only. Roller rockers and girdles OK. No roller cam bearings.
4. Gear drive and dry sump oil systems OK.
5. Holley #4412 or Demon or 9647 Series 500 CFM. 2bbl. carburetor. Track Go-No-Go gauge will monitor carburetor specifications, top and bottom. If you are using anything but a stock appearing 4412 have track teck personel approve before racing
6. 1 11/16” throttle bore; shafts and throttle plates must be stock. Choke tower may be removed. External jets OK. THREE METAL throttle return springs MANDATORY.
7. Venturi may be opened .010 over catalog specs. Venturi must be concentric
8. Aluminum 4bbl. intake manifold OK.
9. Bottom of carburetor may be no more than 4” from top of manifold. No ram intakes.
1. Any ignition system or magneto allowed.
2. Must carry battery. Recommended location: under driver’s seat.
3. If battery is WET TYPE, must be covered to prevent acid spills.
4. Cars must start each event from the staging WITHOUT ASSISTANCE. Cars requiring assistance at original start must go to the back of the pack.
5. On board, working starters are REQUIRED.
6. Assisted starts from red flag work area, during red flag conditions OK.
7. Steel or approved aluminum shield that covers the flywheel MANDATORY when bell housing is inside the cockpit.
8. Cars must have a clearly marked ON/OFF ignition switch within reach of the driver and visible to rescue workers.
9. Each car must have ˝ hole in valley of intake with unobstructed view of lifters. Those without this will be required to remove manifold.
1. RACING alcohol only.
2. NO ADDITIVES. Top end lube OK.
3. Specific gravity must be within 10% of on-track fuel for that night.
4. No electric fuel pumps.
MUFFLERS: Mandatory 95db @ 100 ft.
ALL SAFETY ITEMS WILL BE DESIGNED AND INSTALLED TO THE SATISFACTION OF THE TECHNICAL INSPECTOR. NO EXCEPTION WILL BE MADE IN THE AREA OF SAFETY. ANY ADJUSTMENTS OR ALTERATIONS SUGGESTED BY THE OFFICIALS WILL BE IMMEDIATELY ENFORCED. YOU HAVE NO RECOURSE.
1. Racing seats ONLY. High back recommended.
2. Headrest must be high impact and energy absorbing.
3. Seat must be mounted in 4 places to the chassis with minimum 3/8” steel bolt and nut.
4. Mounting hole in seat must have a 2” diameter mounting plate with a minimum .060”
5. Seat belts must be 2 years old or newer. 5-point hook-up with 3” belts minimum.
6. Roll cage padding required. Kneepads and guards required.
7. Quick release steering wheel mandatory.
8. Snell SA95 or newer helmets are required.
9. Arm restraints are mandatory.
10. Fireproof uniforms, gloves and shoes are mandatory. SF13.2A/1 rating minimum.
11. Head socks or skirts mandatory.
12. Neck collars or HANS type device required. HANS type devices are highly recommended.
13. No 2 way radios, Raceceivers recommended
WANTON VIOLATION OF RULES RECEIVES 2 WEEK SUSPENSION, LOSS OF POINTS FOR SEASON THUS FAR, & CONFISCATION OF OFFENDING PARTS.
RACE FORMAT AND RULES REGARDING PROCEDURE
A Pill Draw as designated by the Marysville Raceway Park officials will determine the heat race starting line-ups.
Heat race format will be 8 laps, up to 10 cars per heat race. Track officials will determine how many cars will transfer to main event, depending upon car count that evening.
“B” Main Event to be scheduled when necessary to determine the final starting positions in
the “A” Main Event field. Race will be 10 laps or less, as determined by track officials.
“A” Main Event will be 20 cars, 20 laps, or as determined by car count, at official’s discretion.
All qualifying cars will be listed in order of start for each event on Pit Board prior to race.
All cars must start WITHOUT ASSISTANCE from the staging area for every initial start in every event. Cars requiring assistance on initial start prior to green flag start must go to the back of the pack. On board starters are required. NO EXCEPTIONS.
1. Front row cars will be side by side at the turn 4 cone. NO EXCEPTIONS.
2. Two original starts will be attempted.
3. A jumped start will result in one or both front row starters penalized for jumping the start at the discretion of the flagman.
4. A single file original start may be imposed by the flagman after two original starts have been unsuccessful.
RESTARTS: The green flag will be displayed when the leader is at the turn 4 cone. You may pass only AFTER passing the turn 4 cone. NO EXCEPTIONS.
The promoter (only) may conclude a race prior to the completion of it’s scheduled distance.
A driver may NEVER switch cars during the course of a Marysville Raceway event. A driver MUST compete in the car he has signed in with at the pit gate.
POINTS (when applicable)
HEAT RACE: NO HEAT RACE POINTS
MAIN EVENT: 1st - 50 points, 2nd - 47 points, 3rd - 45 points, 4th - 43 points, 5th - 41 points. Then a one point drop through the entire entered field, assuming they compete in their scheduled events. You must start an event to earn a finishing position and the points associated with it.
YELLOW- CAUTION, MAINTAIN POSITIONS. No pit crews are allowed on racetrack during yellow flag. If you stop on a yellow, you will go to the back of the lineup, unless a safety issue is recognized by an official. Any car that receives two charged yellows in any one race will be black flagged for the remainder of that race, but he/she will receive starting points if earned and/or any position gained at the finish of that race. Being charged with a red and a yellow flag will have the same effect as two yellows.
A charged yellow will be when a car brings out the yellow flag by their own actions and not as the result of trying to stop to avoid another incident on the track. If a car brings out the yellow but continues (i.e. car does 360 but keeps going), that car will be sent to the back for bringing out the yellow flag. This will not be considered a charged yellow flag for purposes of the two yellow rule.
Laps run on a yellow will not be counted and will revert back to the previous lap scored.
RED FLAG - STOP, DANGEROUS CONDITION. Any car involved in a red flag will go to the back of the pack on the restart.
On a red flag, all work is permitted in the designated red flag work area only. To hold your
position on a restart, your car must stay on the track. If you go to the pit area, you will lose your restart position. If a car is not ready in a timely manner after a red, they will lose their position and restart the race at the rear of the line-up.
BLACK FLAG - PLEASE EXIT TRACK IMMEDIATELY
Rough driving and/or unsportsmanlike conduct, loss of muffler or exceeding sound level, excessive smoking or other condition deemed a hazard to themselves or others will be black flagged. Car will be allowed to return to the race track after repairs have been made, during the next caution flag, but will be put to the rear of the field.
It is our intention to have a safe and fair environment. Please adhere to the rules herein. Approval of a vehicle shall only mean that the car is approved for participation. Approval does not mean the car is mechanically safe or sound. Marysville Raceway Park, it’s staff or management will not be liable for losses due to any mechanical failure, driver error, nor for any losses, injuries or death resulting from same.
The top four winners of the “A” Main Event will exit to the tech area immediately following the race. DO NOT GO TO YOUR PIT AREA. All points for the night will be deducted. If you are not sure, go to the tech area first. No crewmembers permitted within 20 feet of the car during tech inspection. Any violations will result in a $25 fine and deduction of 5 championship points.
AMB Transponders are MANDATORY, either direct powered or rechargeable.