N.I.D.R.A

Modifieds Rules  

    DRIVERS WILL NOT AQUIRE ANY POINTS UNTIL THEY BECOME

A MEMBER OF THE NIDRA.    

For 2008 - 2010  

1. ROLL CAGES - Roll cages must be constructed of 1 1/2 inch OD

minimum 1020 steel tubing, having a wall  thickness of  0.120 or

equivalent materials. Must be minimum clearance of 3 inches between

drivers helmet and roll  cage top.  

2.  Roll cage will consist of four (4) uprights, two (2) front of the driver and

two (2) behind the driver,  boxed in at the top and rear uprights to be X’ed

Three (3) horizontal (sissy) bars are required on the left side and two (2)

on the right side of the cage. Either front or rear upright must be braced at

2/3’s of the cage height. Cage must be welded or bolted to frame, 1/4 inch

Inspection hole. Inspection hole in main cage is mandatory.  ALL WELDS

IN CAGE MUST BE GUSSETED.  

3. Padding required around driver.  

4.  Must have knuckle bar drivers side.  

Fire Walls:  

1.  Must be secure firewall between engine compartment and driver, and between fuel cell and driver. Must be metal or other fireproof materials.  

Batteries:  

1.  If mounted in drive compartment, battery must be in spill-proof box and well secured. If mounted else where, the battery must be well secured. No nylon or rubber straps. Must be metal straps or rods.  

2.  Covering with inner tube or such material will not be allowed.  

Safety Gear:  

1.  Seat belt must have a five point harness of aircraft type, less than five (5) years from date of manufactured or tech committee approved. Minimum width of seat belt is three (3) inches, shoulder straps also three (3) inches in width or as approved my tech committee. Seat belts must be securely mounted to the frame or roll cage and have a quick release. They must be worn at all times while your car is on the track. Harness must be inspected and approved by the tech committee.  

2.  All cars must carry a minimum of 2 1/4 lb. dry chemical fire extinguishers, within easy reach of driver while strapped in. MUST BE ABC TYPE.  Will be checked periodically by tech committee.                                     

3.  Battery kill switch that shuts off the car, must be highly visible and accessible by driver and outside, and marked with a fluorescent color to cue safety personnel.  

4.  Racing seat mandatory, securely fastened to the frame or roll cage. Must fit driver.  

5. SAFETY RULES WILL BE STRICTLY ENFORCED, NO GRACE ALLOWED.  

Screens:  

1.  Drivers half of the windshield must be covered with protective screen of maximum 1/2 inch mesh, of  high quality construction. Driver’s door should have an approved NASCAR net or 1/2 inch screen. MUST BE REMOVABLE FOR SAFETY.    

Mud Flaps:  

1.  Functional mud flaps must be sixteen (16) inches wide and two (2) inches from the ground on both sides. Flaps must extend outside the tire and be securely mounted to the car, subject to tech committee approval.  

Hoods, Doors and Trunks:  

1.  Hoods, doors and deck lid must be bolted in a minimum of two (2) places, if hinges are used. If hinges are not used, they must be welded or bolted in a minimum of four (4) places.  

2.  Hoods must cover top of engine and the radiator. Air cleaner holes are optional.   3.  Must have a two (2) inch roll on sides of hood or pass tech committee approval.  

Bodies and Frames:  

1. * Minimum weight for ALL modifieds  2800 lbs, including all liquids and driver.  

2.  Bodies may be coup or sedan, after market modified styles are optional, stock appearing. Must have a top over roll cage. Bodies should have no more then eight (8) inches of lift from front to rear.  

3.  *NO pick ups.  Model T’s and Model A’s allowed.  

4.  No mirrors allowed.  

5.  No front fenders allowed.  

6.  Frame may be any type. Any tube frame must be two (2) inch by three (3) inch - 120 walls minimums.  

7.  *8 inch spoiler allowed. Wing spoilers and airfoils are not allowed.  

8.  All cars must be neat in appearance, no dark colored cars.  

Suspensions:  

1.  Front type suspension may be (not to exceed a 3/4 ton pick up) straight axle or A-frame type. Commercial or power steering can be sued on all cars. All cars must be two-wheel drive, driven by rear wheels only.  

2.  Any front suspensions. After market upper A-arms are OK.  

3.  Torsion bars are allowed.  

4.  Rear suspension must be solid one-piece axle housing with leaf or coil springs, functioning in stock manner. May be lightened or beefed but must support weight of car.  

5.  Any weight jack may be added.  

6.  Differential must not exceed 3/4 ton pick up size.  

7.  All stock rear ends must have axle-bearing retainers spot-welded.  

8. Quick-change rear end optional. No gear change after time-ins, unless approved by tech committee.  

9.  Rear end width measured center of tire to center of tire, minimum of 60 inches.  

10.  No torque tube drive shafts allowed.  

11.  Any torque are or third link optional.  

12.  Coil over shock allowed.  

Nerf Bars:  

1.  Nerf bars MUST BE on front and rear of car, must have no sharp or protruding edges beyond frame. All must be 1 1/4 inch .095 wall minimum.   2.  Front nerf bar (bumper) must not extend past frame width. Nerf bars must be rounded, smooth bent. A minimum of 10 inches tall and 14 inches from the ground and 3/4 the tire width in the back.  

3.  Nerf bars on side of the car are required and must be 1 1/4 inch OD minimum, must extend 10 3/4 of the outside of tires, not to exceed 1 inch past tire width. Subject to tech committee approval.  

Scatter Shield:  

1.  Any NHRA or NASCAR approved explosion-proof bell housing required or  have a scatter shield of 1/8 inch steel plate. Scatter shield will cover a minimum of 180 degrees of the top of the bell-housing, and be securely fastened to the frame or engine.  

2.  Automatics will have a safety blanket over transmission.  

3.  A driveline strap of 1/4 inch by 1 inch or equivalent steel strap must be installed within 12 inch of rear transmission. No chains or cables.   Transmission and Clutch:  

1.  Any American made stock production type transmission may be used.  

2.  Must have working reverse and neutral gears.  

3.  No in and out boxes.    

4.  Oil coolers may be added but must be below window line, shielded from driver and opponents, not in  the back window. Must pass tech committee inspection.  

5.  Clutches and torque converters are open.  

6.  Must run a flywheel, aluminum or steel.  

Brakes:  

1.  All cars will have a minimum of 3 wheel brakes in good working order, which will result in 4 skidding tires.  

Wheels and Tires:  

1.  Wheels must be steel only, not to exceed 10 inches in width.  

2.  Centers must be reinforced with 1/2 inch steel plate or extra heavy-duty type.  

3.  No duels allowed.  

4.  Minimum of 100 inch wheel base on both sides.  

5.  *New racing tires / recaps ONLY DOT approved highway tires, except in open comps. Which will be driver’s choice.  Sipping and grooving is optional. Tread width will be a minimum of 8inches and not to exceed 11 inches in width.  

6.  NO MUD, SNOW OR TRACTION GRIP TIRES.  

7.  5/8 inch studs mandatory.  

Engines:  

1.  Super traps on exhaust are allowed.  

2.  Engines must remain upright and in center of frame.  

3.  Engines set back no further then 17 inches behind center of line kingpin, as measured from the number one (1) spark plug hole. Center to lower ball joint center  

4.  All engines must be radiator type cooling.  Oil or additional coolers may be added but must not be in driver’s compartment.  

5.  All engines must have a working starter.  

6.  No electrical fuel pump.        

Engines V-8 Maximum 361 cid per engine serial number American only.  

1.  *Any single 2 or 4 BBL 750 cfm max. Carburetor must be used, Holly, Carter, Rochester or Motor craft. Choke horn optional. Deamon Carb allowed up to 750. NO predator allowed.    

2.  Any single 2 or 4 barrel cast iron or aluminum intake may be used.  An adapter may be used, 2 inch max.  

3.  Engine must be naturally aspirated. NO INJECTORS, BLOWERS, TURBOS OR NITROUS OXIDE SYSTEMS.  

4.  Headers are legal, but must pass tech committee.  

5.  After market Ignitions Allowed.  NO magnetos or crank trigger ignitions.   6.  Flat tappet cams only. Roller rockers optional. No roller cams. Any size cam.  

7.  No 400 blocks. No stroker engines, any steel rods any after market cranks, except for balancing.  

8.  Engine block heads and internal parts to be factory replacement type. NO ALUMINUM HEADS, BLOCKS OR RODS. Any pistons may be used or cast iron heads.  

9.   *Stock OEM heads can be ported and polished. No porting and polishing of intake or exhaust.  

10.  * Gear drives optional  

Engines 4, 6 and V-6 for Modifieds:  

1.  Any 4 or 6 cylinder American made may be used.  

2.  No CID limit. No stroker motors allowed.  

3.  Any intake and exhaust system may be used. Must be naturally aspirated. No injectors, blowers, turbo or nitrous oxide systems.  

4.  Any single maximum 750 CFM, 2 or 4 barrel may be used.  

5.  After market Ignitions Allowed.  NO magnetos or crank trigger ignitions.   6.  Any pistons and valves may be used.  

7.  V-6 must have cast iron heads and blocks, any intake and solid lifter cam.   8.  No porting, polishing or grinding of intake, exhaust or combustion chambers allowed.      

Fuel:  

1.  Fuel cell mandatory with metal outer casing, and foam inside the bladder.  Tank must be secured by 2 or more 1/8 inch by 1 inch steel straps or bolted.   2.  Racing fuel, trick fuel allowed. NO ALCOHOL OR NITROUS.    

IF IT’S NOT IN THE RULES IT’S NOT LEGAL!