Super-Stock Class Rules

Note: These rules state only those modifications that are allowed. It is the entrants sole responsibility to demonstrate that their "cars" meet these rules at all times. Modifications performed on entered "cars" that are not specifically identified in these rules will not be allowed and the "car" will be disqualified. In areas where specific modifications are identified, entrants may propose alternative methods, not listed in the rules, to achieve the same function as the identified modifications. The legality of these modifications will be determined on a case by case basis and may be allowed if the modification performs the function allowed without also resulting in a competitive advantage over the specific modifications identified.

Body Rules

1. Body must be one of the following:
• A. Stock Aurora T-Jet original,
• B. Stock Model Motoring original,
• C. Stock Johnny Lightning (JL) ThunderJet-500 original,
• D. Stock MEV original (Including GT Racers),
• E. Stock HO Detroit original,
• F. Stock Road Race Replica (RRR) original, including “RaceJets” with molded in glass.

Note:  Fairground specials, factory lightened, "Fray Kit" and similar lightweight bodies are not allowed.

2. Body cannot be lightened. Wheelwells and the lower edge of the body cannot be modified.  Body may be lowered.  However, the body posts must touch the chassis when placed on a chassis having full height gearplate rails.
3. All windows must be stock (thick plastic) glass. Film windows are not allowed.  Lower edges of windows may be trimmed to avoid interference with the chassis and/or gears.
4. Open wheel bodies (Indy, Grand Prix etc.) are not allowed.
5. The body must completely cover the chassis when viewed from above except for legal stock openings (i.e. windows).
6. Body must not exceed original width.
7. Each body must have originally equipped or reproduction bumpers.
8. Two screws must be used to mount the body to the chassis.  Screw heads may be modified for track clearance.  Screw heads shall be no larger than 0.165” in diameter.
9. Body must be equipped with two screw posts.
10. Split screw posts may be repaired or replaced with plastic in their original and intended position(s). No metal sleeves are permitted.

Chassis Rules

1. Chassis must be stock T-jet copper. Bending of motor brush springs is allowed. No other chassis modifications are allowed.
2. Removal of gearplate rail is permitted, patent number must be legible. No other cutting, grinding, or drilling of chassis, gearplate, or gearplate clamp is permitted.
3. Solder or glue is allowed to attach gears to shafts.
4. The cluster shaft shall be stock (steel).
5. All gearplate gears must be stock T-jet brass 14-tooth pinion and 24-tooth idler and driven gears. Gears may be polished to provide a smooth mesh. Drilled, grooved, chamfered, or lightened gears are not allowed.
6. Rear end gears must be stock T-jet 9-tooth drive pinion with stock T-jet 15 tooth crown gear.
7. Guide pins must be either stock black Aurora or mass-produced molded plastic guide pins. Pin length may be shortened. No rear or swivel guide pins permitted. Gluing of guide pins to chassis and countersinking of the guide pin screw hole are permitted.
8. Cars must use original stock, reproduction stock, or narrow double-flanged plastic T-jet rims mounted any magnetic steel axle. The width of the chassis must be no wider than 1.085 inches, measured at the outside edges of the rims.
9. Rims must be equipped with rubber, silicone or plastic tires.  Maximum tire width is 0.100”.  Minimum front tire diameter is 0.325". Minimum rear tire diameter is 0.355”.  Tires may not easily rotate independently from the rims.  Tire/Rim lubricant may not be used.
10. Maximum front axle lateral movement is 1/32" (0.03125”).  Non-metallic (i.e. plastic or phenolic) flat washer type spacers with a maximum diameter of 3/16" (0.1875”) may be used on the front axle only to limit lateral movement. All spacers must be located outside of the chassis. Wheel weights and/or hubcaps are not allowed.
11. Front axle may be located in any stock wheelbase position. The center (truck) position must not be used.
12. Any original Aurora pancake style "armature" with no more than two "stack" gray laminations and with all of its original windings "unmodified" may be used and may be balanced. (No stock-replacement, dewind, rewind, turned or epoxy coated motors are allowed).
13. The average "armature" pole resistance as measured from pole to pole must be equal to or exceed 16.0 ohms at ambient room temperature following a 5-minute cooldown.
14. Magnets must be stock Aurora that fit the T-Jet chassis. JL or Super II magnets are not allowed. Magnets must not be cut, drilled, or sanded. Legal magnet setups will not pick up a John Deere 10 gram groove pin (stock #25H534) completely off of the table. (Note: Test is performed on the assembled chassis).
15. Magnets may not be shimmed.
16. Any and only copper/carbon brushes, flat top and bottom, are allowed. The brushes may be lightly scored in a maximum of two places (X pattern) to prevent rotation.
17. Pickup shoes and springs must be stock copper T-jet or stock replacement. (Aurora or American Line) No weights, wires, or creative bends allowed. Pick up shoe travel may be limited. Ski shoes are not allowed.
18. The "step" in the pick-up shoe must remain intact and be unaltered, except for only that the first bend may be changed slightly so that proper "pick-up shoe" to "rail" contact can be achieved. No attempts to "flatten" the "step" are allowed. The area between bend 1 and bend 2 may be "flattened" to achieve better contact with the "rails". The front, vertical, slotted portion of the pick-up shoe may be bent to limit shoe travel. The rear, hook portion of the pick-up shoe may be bent to limit shoe travel and adjust shoe tension. Heat shrink tubing may be placed on the front, vertical, slotted portion of the shoe, prior to Bend 1, to limit shoe travel.

19. The chassis' copper pickup retainer may be bent slightly to improve electrical contact.
20. Pickup springs may be cut, crushed or lengthened. Washers or spacers shall not be used to adjust spring tension.

"NITRO" Class Rules

Note: These rules state only those modifications that are allowed. It is the entrants sole responsibility to demonstrate that their "cars" meet these rules at all times. Modifications performed on entered "cars" that are not specifically identified in these rules will not be allowed and the "car" will be disqualified.

Complete car rules

1. The complete "car" must not weigh less than 20.0 grams and no more than 24.0 grams.
2. The complete "Car" must not exceed the maximum allowed width of 1.3125" (1-5/16").

Body rules

1. "Bodies" must be based on and visually represent an actual full-scale car.
2. "Bodies" must be manufactured by either the process of casting or injection molding, be made of resin or plastic, have two screw posts and may be painted.
3. "Bodies" must be originally manufactured with the intention of being mounted, with the use of two screws via two body mounting posts, on a/an: Aurora Model Motoring (which includes: Vibrator, ThunderJet, Wild Ones, Tough Ones and Xlerators), Bachmann, Faller, Model Motoring ThunderPlus, Marx, Eldon or Tyco "S" series "HO" chassis.
4. "Bodies" with cast in handling pans or exaggerated details such as unrealistic or inappropriate hood scoops, sloped sides or snow plow noses are not allowed.
5. No ballast or fillers, other than color pigment, are allowed in the plastic or resin.
6. Maximum overall "Body" width is 1.200".
7. The maximum thickness of the sides of the "Body" including items such as fender flares and running boards is 0.125".
8. Spoilers, wings and other external detail may be added to the "Body" however these items cannot cause the body to exceed the body width limit.
9. With the "Body" mounted securely to the "Chassis" and viewed from above, the "Body" must cover the "Chassis" except through windows and radiator exhaust vents. Unrealistic or overly large windows are subject to repair (See Body Rule 23)
10. With the "Body" mounted securely to the "Chassis" and viewed from the side of the "Body", the upper edge of the top-plate, minus rails, cannot be above the top of the "Body" as measured at the rear of the top plate. (i.e. The gear plate cannot stick out the rear window)

11. "Bodies" must be fitted with all the manufacturer's original or exact replicas bumpers, heads, rollover bars, etc. in their stock locations.
12. The "Body" to "Chassis" mounting posts may be shortened by cutting or grinding for the purpose of lowering of the "Body" on the "Chassis assembly" provided that Rule 10 is not violated.
13. Cracked or broken "Body" mounting posts may be repaired or replaced with the use of glue and/or a plastic sleeve around the original post or a plastic tube in place of the broken post.
14. Other than the plastic post reinforcements stated in Rule 13, no additional weight can be added to the "Body".
15. The "Body" may be lightened by removing material through the process of grinding or scraping, as long as rules 10 and 11 are not violated.
16. "Bodies" that have a separate roof and windshield casting/molding, and have molded in "interiors" (also know as Hardtops, e.g. Aurora's '65 Mustang), may completely remove the "interior" portion of the "Body".
17. Front and rear wheel wells may be opened up for tire to wheel well clearance. The wheel opening cannot exceed 0.125” from the outside edge of the tire. Bodies manufactured with oversize wheel wells will be allowed if the oversize wheel wells resemble those on the original 1:1 car. In those cases the wheel wells must not be modified. Examples would be the Dino and Cheetah.
18. Wheel wells must not be modified in such a way to allow the use of any other wheelbase than that was originally intended by the manufacturer of that body.
19. Two screws must be used to mount the body to the chassis.  Any body mounting screw may be used.  Non-magnetic screws are recommended so that a loose screw will not be picked up by a passing car, thus causing damage to the car and / or the track.  Screw heads may be modified for track clearance.  Screw heads shall be no larger than 0.165” in diameter.
20. Both front and rear screws must be used and must secure the body to the chassis at all times.
21. The front windshield must be plastic or resin, clear or painted, may be glued in place and must fill the frame. "Tape" windshields are not allowed. The side and/or rear windows may be removed.
22. Bodies that violate rules 9 and 10 by having illegal openings such as too large or unrealistic windows, missing engine covers and open truck beds may be repaired by gluing a 0.025" minimum thickness plastic cover over the opening. The repair must be made so that its thickness can be checked using a micrometer having a 0.250” diameter anvil.

Chassis Assembly Rules

1. Only original Aurora ThunderJet "chassis assemblies" with copper electrics are allowed.
2. The "chassis" axle and armature holes may be slightly opened up for increased clearance.
3. The "chassis assembly" must not be fitted with "bushings".
4. The "chassis" may be trimmed slightly (no more than .010") to allow for crown gear tooth clearance.
5. Any original Aurora pancake style "armature" with no more than two "stack" laminations and with all of its original windings "unmodified" may be used and may be balanced.  (No stock-replacement, dewind, rewind, turned or epoxy coated motors are allowed).
6. When measured across two different commutator segments, the average resistance of the "armature" poles must meet or exceed the ohm criteria at ambient room temperature following a 5-minute cooldown. 

·        Cars fitted with Johnny Lighting (JL) magnets shall use Gray 2-stack armatures with an average pole resistance of 16-Ohms. 

·        Cars fitted with Aurora magnets shall use 2-stack armatures with an average pole resistance of 15-Ohms.

7. Any and only original Aurora motor magnets without the "dimple" or JL magnets must be used.  JL magnets maybe lightly sanded for purposes of fitting them into the chassis.  The distance between magnets must be at least 0.700”. 
8. Aurora magnets may be shimmed with ferrous or non-ferrous material. JL magnets may not be shimmed. Shims are not allowed on the top of or under the magnets.
9. Any and only copper/carbon brushes, flat top and bottom, are allowed. The brushes may be lightly scored in a maximum of two places (X pattern) to prevent rotation.
10. The motor brush spring may be bent to adjust tension and improve electrical contact.
11. Only stock or commercially available 14-tooth "armature" gears are allowed.
12. Only stock or commercially available 24-tooth brass idler and driven gears are allowed.
13. Only stock or commercially available 9-tooth or 12-tooth rear end (final drive) pinion gears are allowed.
14. Only stock or commercially available 15-tooth crown gears are allowed. The crown gear boss may be trimmed or spacers may be added between the chassis and gear to adjust for proper gear mesh.
15. Gear tooth friction surfaces may be de-burred by polishing, filing or sanding.
16. Gears may not be chamfered, lightened or "relieved".
17. Gear and armature shafts may be adjusted up or down relative to the top plate gears. Shafts shall be stock, steel and may not be trimmed, cut or shortened
18. Solder or glue may be used to secure the gears to their respective shafts.
19. Any front tire, rim and axle assembly may be used. Minimum front tire diameter is 0.325"..
20. Any commercially available, mass produced, slip on silicone or rubber rear tire can be used on commercially available double flanged rims.  Minimum tire diameter is 0.355”.  Any rear axle may be used. Tires may not easily rotate independently from the rims.  Tire/Rim lubricant may not be used. Tire Doping or
    treating with chemicals is not allowed.
21. With the exception of gear spacers discussed in Rule #14 all front and rear axle spacers must be located between the chassis and the wheels.
22. Maximum overall width of any part of a Fray car must be less than 1-5/16" (1.3125"). Maximum front axle lateral movement is 1/32"
23. The center front axle truck hole must not be utilized.
24. Pickup shoes and springs must be stock copper T-jet or stock replacement. (Aurora or American Line/REH) or the BSRT #504 “Thundershoe”. No weights, wires, or creative bends allowed. Pick up shoe travel may be limited. Ski shoes are not allowed.
25. The "step" in the pick-up shoe must remain intact and be unaltered, except for only that the first bend may be changed slightly so that proper "pick-up shoe" to "rail" contact can be achieved. No attempts to "flatten" the "step" are allowed. The area between bend 1 and bend 2 may be "flattened" to achieve better contact with the "rails". The front, vertical, slotted portion of the pick-up shoe may be bent to limit shoe travel. The rear, hook portion of the pick-up shoe may be bent to limit shoe travel and adjust shoe tension. Heat shrink tubing may be placed on the front, vertical, slotted portion of the shoe, prior to Bend 1, to limit shoe travel.

26. The chassis' copper pickup retainer may be bent slightly to improve electrical contact.
27. The pickup springs may be cut, stretched or smashed.  Washers or spacers shall not be used to adjust spring tension.
28. The vertical "gearplate rails" above the "upper horizontal plane" may be removed. No amount of material may be removed from the "gearplate" at or below the "upper horizontal plane". The serial/patent numbers and letters must remain intact.
29. Only original Aurora black plastic or identical replacement plastic guide pins must be used. The pin portion may be cut, trimmed, or bent. The guide pin may be glued in place. Countersinking of the guide pin screw hole is permitted.

Johnny Lightning Class Rules

JL Body Rules

Note: These rules state only those modifications that are allowed. It is the entrants sole responsibility to demonstrate that their "cars" meet these rules at all times. Modifications performed on entered "cars" that are not specifically identified in these rules will not be allowed and the "car" will be disqualified.

1. Body must be JL bodies produced to fit the Aurora T-jet chassis. Split screw posts may be repaired or replaced with plastic in their original and intended position(s). No metal sleeves are permitted.
2. Body cannot be lowered. Fender wells may be cut for tire clearance provided general body rule #1 is not violated.
3. All windows must be stock. Lower edges of windows and the interior of the body can be trimmed to avoid interference with the chassis and/or gears.
4. Bodies must be mounted with stock JL Philips head self-tapping screws. Screws cannot be modified.

JL Chassis Rules

1. Chassis must be stock JL Tuff-One. Bending of motor brush springs is allowed. No other chassis modifications or replacements are allowed.   Rear axles may be replaced with 0.062” dia. steel, splined axles (i.e. truck axle).
2. Maximum front axle lateral movement is 1/32"  (0.03125”).
3. Any plastic front rim may be used.  Sleeves, washers or additional front end weights are not allowed.  Front rims must be equipped with rubber or plastic tires having a minimum tire size of 0.355".  Front tires may be glued onto the rims.
4. Any commercially available, mass produced, slip on rear tire can be used on commercially available 0.177” dia. double flanged rims.  Minimum rear tire diameter is 0.355”.  Maximum rear axle width is 1.250”, measured at the outside edges of the rims.  Tires may not easily rotate independently from the rims.  Tire/Rim lubricant may not be used.
5. Armature, Gears and Magnets must be stock as provided with the JL car.
6. Motor brushes must be stock JL or Thunderbrushes.  Thunderbrushes, if used, may be lightly scored in a maximum of two places (X pattern) to prevent rotation.
7. Guide pins must be either stock JL, stock black Aurora or mass-produced plastic guide pins identical in dimension to the stock Aurora pin. Pin length may be shortened. No rear or swivel guide pins permitted. Gluing of guide pins to chassis is permitted. The guide pin hole cannot be modified.
8. Pickup shoes and springs must be stock JL silver or stock replacement T-jet copper (Aurora or American Line/REH).  No weights, wires, or creative bends allowed.
9. The "step" in the pick-up shoe must remain intact and be unaltered, except for only that the first bend may be changed slightly so that proper "pick-up shoe" to "rail" contact can be achieved. No attempts to "flatten" the "step" are allowed. The area between bend 1 and bend 2 may be "flattened" to achieve better contact with the "rails". The front, vertical, slotted portion of the pick-up shoe may be bent to limit shoe travel. The rear, hook portion of the pick-up shoe may be bent to limit shoe travel and adjust shoe tension. Heat shrink tubing may be placed on the front, vertical, slotted portion of the shoe, prior to Bend 1, to limit shoe travel.

10. The pickup springs may be cut, stretched or smashed.  Washers or spacers shall not be used to adjust spring tension.