2013 Spring City Raceway
Mod Lite Regulations
All drivers must be a minimum of fourteen (14) years of age. All drivers under 16 years of age MUST have a signed waiver by parent or guardian.
1. BODY STYLES
Any car specifications not covered in these body specs are subject to North Ga Speedway interpretation. Any significant performance advantage will be addressed on an individual basis. North Ga Speedway reserves the right to determine what constitutes an unfair advantage.
(a)1928-1948 American made production vehicles only, 5/8 scale, two door sedans, coupes, or pickup trucks. These are to be known as Classic Modified body styles.
(b)Modified appearing body style such as IMCA or DIRT modified. These are to be known as Modified Lite body styles.
(c)All chassis specifications are the same for both body styles.
2. BODY REQUIREMENTS AND SPECIFICATIONS
(a)Body must be 5/8 scale, stock appearing. Maximum outside tire width 60″, Cars must pass freely through a hoop 60 1/2” wide by 50” high, 73” wheelbase plus or minus 1″.
1.Must have grill shell or simulated open radiator matching original body style, any material.
2.Doors, windows, and cowlings must retain stock appearance. Hood louvers allowed for cooling, but must maintain stock contours.
3.Engine compartment must conform to scale and match contour of body. Hole may be cut for breather clearance only. Ram air induction system prohibited.
4.Must have closed trunk lid or fully enclosed trunk access panel conforming to original bodylines. Louvers allowed no holes.
6.No wings or spoilers.
7.Ram air induction system prohibited.
(b)Body will be metal construction, 26gauge steel or .040″ aluminum minimum. Fiberglass or plastic grill shells allowed. All exposed edges must be folded or trimmed over. Legends cars may be allowed under local rules. No lips or spoilers of any kind.
(c)NO open top cars (roadsters, convertibles). No panel trucks, station wagons, or specialty cars.
(d)Classic Modified Overall Dimensions
1.NO car over 50” tall, top to ground. Body height maximum 44”, bottom edge to top (including frame rail).
2.Maximum body width: 38” Maximum frame width 34”; min 30”
3.Body contour must follow frame and roll cage. Roof hatch entrance allowed.
4.Frame ride height must not let car bottom out on track.
5.Drivers door must be operational and equipped with secure latch.
6.Fasteners on hood, trunk, or panels must be positive, locking type.
7.124” maximum total length, bumper to bumper.
8.Kick outs or side nerf bars must be mounted at three points and run full length between tires. 1 ¼” max .125 wall thickness. Cannot stick out beyond 1” from the side of the tire.
The intent of these preceding specifications is to follow the bodyline and design of an exciting IMCA or DIRT modified racecar.
2b. MODIFIED LITE
(a) OVERALL DIMENSIONS
1.A.. 42″ min 50″ max from ground total car height.
2.B. 124″ maximum total length, bumper to bumper.
3.C. SIDES AND REAR QUARTER PANEL 1.84″ max Door and rear quarter length.
2.2.. 30″ min 38″ max side height of rear quarter panel from the ground. 30” max height of quarter panel.
1.20″ min 27” max hood height excluding breather protectors (bottom of frame rail to top of hood). Ram air induction system prohibited. Rear of hood becomes part of windshield area rules. No part of nose section (in front of spindle centerline) may be wider than a maximum of 24”. Hood may taper out to door panels at the rear.
F. ROOF PANEL
1.40″ min 48″ max length of roof panel. 36″ min 42″ max width of roof. No part of roof panel may have more than 14o of angle rake. No deflector of any type on upper sides or rear of roof panel. Roof entrance hatch optional.
G. REAR UPPER QUARTER PANEL
1.20″ min 38″ max rear upper side panel may contain Plexiglas. Side panels maybe no higher than 3″ at the rear of the straight line of quarter panel top edge. Side panel may be no higher than an imaginary line from the rear edge of roof panel to 3” above the top edge of the rear quarter panel.
H. SIDE WINDOW
1.18″ min side opening length. 10″ minimum side opening height front and rear.
1.46″ min 50″ max width of rear shelf and body panels. Rear shelf may have no more than a 5o max rake and may not be concave or convex in design. Rear Spoiler may be used and will be a maximum of 4 inches attached to the rear deck lid only. The rear frame area from the rear shelf downward a minimum of 16” must be completely enclosed the width of the frame. Louvers allowed, no holes.
J. ADDITIONAL INTERIOR SPECIFICATIONS
1.36″ min 56″ max length of right side pod area with max 30o. Left side pod may be altered for driver access.
2.Rear quarter distance from center of rear 20″ min 30″ max.
3.Cockpit cover with a max of ½” lip will be permitted providing the on/off cutoff switch is reachable from outside the car by safety personnel.
4.Deck lid height from ground 30” minimum, 36” maximum. Rear Spoiler may be used and will be a maximum of 4 inches attached to the rear deck lid only
5.Side pod may not extend rearward past the centerline of rear axle.
6.Body must be centered on chassis.
7.If windshield is used, it must be flat.
8.All body dimensions will be teched + or – ½” unless otherwise specified.
K. Body will be metal construction, 26 gauge steel or .040″ aluminum minimum. Fiberglass or plastic grill shells and hood components allowed. Fiberglass roofs are allowed. All fiberglass/plastic parts must comply with all regulations for size and height.
a) All cars with STOCK 1000cc max engines must weigh a minimum of 1240 lbs with driver after race.
b) All cars following “Spec Motor” program or “open motor” that are oil or air cooled and under 1100 cc’ must weigh a minimum of 1300lbs, with driver after race. (1000cc motors modified beyond stock but that have not had displacement increased fall here as well as ALL oil or air cooled engines over 1100cc’s)
c) “Open Motor” program, 1200cc OEM and 1070cc engines will have to weigh 1450lbs with driver. 1000cc motors with increased displacement less than 1070cc must weigh 1340 lbs with driver after race. (1200cc engines will no longer be permitted in 2013.)
d) No weight outside of car body, i.e. on nerf bars
e) Hood will be clearly marked with cc displacement and minimum weight as outlined in Engine Specification, Paragraph 11.
f) This weight program will be monitored for parity and competitiveness and may be changed at the discretion of North Ga Speedway.
4. BUMPER DIMENSIONS
(a) Front maximum width 30″, Bumper height 6” to 8″ with 2 bar loop. Ground to top of bumper: 12” minimum, 16” maximum. Bumper may not extend more than 12″ forward of front tires.
(b) Rear maximum width 56” with 3 vertical bars. Bumper height 6” to 8″ with 2bar configuration. Ground to top of bumper: 12” minimum, 18” maximum. May not extend more than 8” behind rear body panels.
100.Bumpers must be hollow with max wall thickness of .1255. FIREWALL
(a) Firewall must be metal and must completely separate engine compartment from cockpit. Engine protruding into cockpit must be enclosed.
(a) Windshield must be Lexan, wire mesh, or protection bars. Lexan highly recommended when running asphalt. No Glass. All other cockpit areas must remain open. Deflectors may be used in front of driver. May be no wider than roll bar area.
7. NERF BARS
(a) Full length nerf bars between front and rear tires mandatory. Maximum outside diameter of 1.25” and .125 maximum thickness, must be hollow and may not extend out beyond tread width more than 1″ at the rear only.
(a) Seat must be high-backed aluminum, racing type. All cars will have a permanent bar located behind top of seat at shoulder level. Bottom of seat will not be more than 63″ back measured from upper ball joint. Seat may be tilted back for added driver head clearance, however, no portion of the seat may be back more than 70″ as measured above.
9. NUMBERS AND GRAPHICS
(a) Car number must be minimum 12″ in height and 2″ stroke. Must be displayed on each door, and roof or trunk. Numbers in 4″ size should be on front and rear of car to help with lineups.
10. WHEELS AND TIRES
(a) Steel wheels only, minimum wall thickness .090″, 13″ only, Wheel width maximum 8″.
(b) , Hoosier racing tires plated UDRA, TUSA, RC1, RC3, or RC5 will be allowed. Maximum tread width 10”. Minimum durometer reading will be 38 with no variance measured before the main event. American Racers will also be allowed.
(c) Bead lock rims are optional
11. ENGINE SPECIFICATIONS
Special note. “STOCK” as referred to throughout this section is defined as the original or direct dealer replacement parts available for the specified year, make, and model of the donor motorcycle. Air box, oil pan and header are outside this rule. The only acceptable variance shall be replacement of known weak parts with “stronger” ones as long as they are not lighter or provide a performance increase. (for example replacement of stock zx12 rods with “h-beam” would be ok but “knife cut” would not)
(a) “ Spec Motor” Specifications:
*1000 cc or less Water-cooled engines produced after 2000 may compete in this program
1. Must remain stock bore and stroke, no altering rod or piston specifications.
2. All head components must remain stock, (except cam sprockets may be slotted type). Cams must be as per original equipment manufactured (OEM) and must meet specs as per manufacturer.
3. OEM stock ignition system only. Power Commanders or fuel monitoring devices permitted but may not include any additional boxes, modules or devices to alter motor functions.
4. Engine must retain its stock fuel induction system. May run aftermarket air filters
5. Alternator recommended but not mandatory.
Engines eligible for this program, Suzuki GSXR 1000, Honda CBR1000RR, Yamaha YZFR1, and Kawasaki ZX10. All other engine requirements apply from section c.
(b) “ Open Motor” Specifications:
1. Side draft motors 1250cc (+1%)
2. Down draft motors limited to 1200cc maximum with no variance.
3. ZX12 Must remain UNALTERED STOCK. Stock OEM fuel injection only. All components must be OEM stock. No lightening or balancing of any components. Removal of flywheel and stator allowed. OEM stock ignition box only to control engine functions. Power commanders or fuel monitoring devices permitted but may not include any additional boxes modules or devices to alter motor functions.
4. Water-cooled engines 1100cc and below can run carburetors or fuel injection systems. Engines above 1100cc OEM must remain in their original stock configuration of carburetors or fuel injection.
5. Down draft engine must run gasoline only.
6. No engine can be modified to be less than original stock configuration OEM specifications.
7. Engine must be in production for a designated time period to determine its competitive relationship with our current motor program. Any major changes to existing engine by the manufacturer must be reviewed by board before approval.
8. OEM Electronic engine components (Power Commanders permitted) will be reviewed annually to insure equality.
9. Carburetors and cams optional. (Except ZX12)
10. Aftermarket cylinder & cylinder heads: No aftermarket cylinder or cylinder heads allowed on water-cooled motors. No aftermarket cylinder heads allowed on oil & air-cooled motors, aftermarket cylinders authorized.
11.Porting, grinding, polishing or changing stock configuration of intake or exhaust ports allowed for oil & air cooled motors. Carburetor/Fuel injection boot must fasten directly to head in the stock intake port location.12. No porting, grinding, polishing or changing stock configuration of intake or exhaust ports allowed on water-cooled motors. Casting part lines must be visible upon inspection. Intake port area may be altered to match intake boot. Alteration not to exceed 3/8” into intake port. Carburetor/Fuel injection boot must fasten directly to head in the stock intake port location
13. Header must attach directly to head in stock exhaust port location
14. Oiling system may not include a dry sump system.
15. No increasing or decreasing of motor stock stroke in any way.
16. 1200cc engines will no longer be permitted in 2013.
(c) “General Motor” Specifications:
1. Four cycle, four cylinders maximum only. Must have working transmission, clutch, and starter with all parts in place. Complete Clutch assembly must remain in engine. External reverse boxes allowed. No air controlled shifting devices.
2. Charging system optional. Battery powered ignition system only. Alternator cover allowed.
3. No auxiliary starters.
4. Engines must be front mounted in engine compartment.
5. Engine setback: The “square of the engine” (rear fins of the jugs) may not extend rearward more than 17″ from the center of front spindle. No part of the engine or transmission may extend rearward more than 21 inches from center of front spindle.
6. No aftermarket fuel injection, and no turbos. No nitro, or nitrous oxide. OEM fuel injection must remain stock.
7. Engine must be cooled by original intent. May use extra fan or oil cooler.
8. Engine exhaust must include muffler and exit rearward. All muffler devices must include baffles. MUFFLER MUST MEET LOCAL TRACK REGULATIONS,
(d) Engine Tech Procedures
1. Cylinder cranking compression minimum 100 p.s.i., Maximum 220 p.s.i. per cylinder average of 4 cylinders, no variance, measured with a Snap-On compression gauge, part number EEPV303A, with adapters EEPV304A, EEPV306A or MT26J200, after ten (10) compression revolutions of cranking, 15-45 minutes following feature event.
2. Carburetors or Fuel Injection and all 4 spark plugs must be removed before checking compression.
12. BATTERY, FUEL SYSTEM
(a) Battery and fuel pump must be mounted outside driver compartment. Battery must be secure and held with non-rubber strap. Electric fuel pump allowed.
(b) Fuel cell mandatory, maximum 5 gallons, located in trunk.
(c) Gasoline or race gasoline available at the event. No alcohol or fuel additives allowed including oxygenation.
(d) Reinforced or steel braided line must be used in all high pressure areas.
(e) A direct manual cutoff switch wired to ground circuit will be installed on the right rear shelf or rear fire wall within 6” of the corner formed by the rear deck and rear fire wall. Switch will be located over the right shoulder of the driver. The emergency electrical cut off switch will be clearly located and marked.
13. DRIVE TRAIN
(a) Must use steel drive shaft from transmission to automotive rear end. Minimum 2.50″ x .083″ or 2″ x .120″.
(b) Quick change rear ends allowed with steel tubes only.
(c) Drive shaft tunnel must have minimum of 2 (3 recommended) 360degree hoops between firewall and seat back. Must be fabricated of minimum .1875″ X 1.5″ steel bar. 1″ X .095″ steel tube highly recommended.
(d) Rear must be locked or have a solid spool.
14. FRAME AND ROLL CAGE
(a) Main frame members will be minimum of 1″ X 2″ x .120″ wall rectangular steel tubing only. Mainframe rail consist of the length between the front lower a-arm
cross member and the rear main roll bar upright. No aluminum allowed in cage or frame.
(b) Main frames will have a minimum of 3 cross members between firewall and back of seat fabricated of same material as frame rails. Alternate material may be steel angle, min. .125″ X 1.5″ X 2″. Cross-bracing in floor under driver strongly recommended. Rear frame rails at rear roll bar must be 34” max and 30” minimum outside dimension. Rear roll bar must meet same dimension as the frame it is mounted to. Frame may taper forward of driver seat area. Front engine area frame width must be 24: max and 20” min outside dimension. Left and right frame rails must be the same + or – ½”.
(c) Roll cage must be DOM steel minimum 1.25″ x .083″ (.095 recommended) in all cars manufactured from 12/98 on.Track may grandfather older cars with 1″ x .065″ tubing. Cross-brace or diagonal strongly recommended in hoop over driver’s head.
(d) All cars must have cage bars installed across door openings on both sides. Bars should be welded in place as part of roll cage. Minimum size 1″ x .065″. (1.25″ x .095″ recommended) cars with bars mounted on doors should have full doorframe and minimum of 2 horizontal cross bars. Minimum 1” x .083″. Cars with bats mounted on doors must have 1/4″ x 2″ steel stops welded in on each side of opening, totaling a minimum of 4″ on each end of door.
(e) It is required to have a steel bar with a minimum size of 1″ X .065″ from doorpost to doorpost, under the dash. Steel plate on driver’s door bars recommended
(f) It is recommended that, if using rivets, body panels attach to tabs welded onto cage instead of drilling multiple holes into cage bars.
(g) No down tube frame cars allowed. Any bars going from cowl area to snout must remain below the upper line of hood.
(h) Classic pickups may have two (2) bars going from upper rear roll cage down to rear clip.