Post by LightninBoy on May 28, 2015 1:09:08 GMT -6
Pure Stock Rules
1 Body
1.1 | The main body structure must be made from wood. |
1.2 | The car body may be enhanced by the addition of other stable materials such as plastic or metal. Any additions must be firmly attached and meet car size requirements. |
2 Car Specs
2.1 | Width: Not to exceed 2 3/4 inches |
2.2 | Length: Not to exceed 7 inches |
2.3 | Weigh: Not to exceed 5.0 ounces (143 grams) on a scale accurate to 1/10 ounce |
2.4 | Height: Not to exceed 2 3/4 inches |
2.5 | Center Rail Clearance: The center rail width is 1 5/8", the wheels must clear center rail and must be on the outside of the rail. |
2.6 | Bottom Clearance: Car must be built to clear the track center rail. The height of the center rail on the track is 1/4" tall. |
2.7 | Wheelbase: Wheelbase must be 4 3/8. There should be no less then 7/8" from one end of the body and no more then 1-3/4" from the other. |
2.8 | There must be 4 wheels and axles installed on the car. Axles must be installed to the side of the body and angle no more then 45 degrees. It is not required that all 4 wheels make contact with the track. |
2.9 | The following modifications are prohibited 1. Having any part of the car go beyond the starting peg 2. Starting devices or propellants (car must be gravity powered) 3. Electronic or lighting devices 4. Liquids, wet paint, oil, sticky substances or powders of any kind (other than lubrication) 5. Glass or excessively fragile parts 6. Bearings, bushing, washers, hubcaps. 7. Loose objects on car 8. Magnets 9. Solid one piece rod style axles |
3 Wheels
3.1 | BSA wide wheels are the only wheels allowed |
3.2 | 1.170" Minimum Diameter/ 7.50mm tread width (Tread width will be measured from the outside of the decorative edge to the inside edge of the wheel) |
3.3 | Wheels may be lathe turned, polished and/or sanded to true the tread surface, diameter, and the edge of the tread. |
3.4 | The tread surface must be flat and parallel to the wheel bore |
3.5 | Removal of the inner and outer step is allowed as well as re-coning of the inner hub. |
3.6 | Wheel Bore treatment is allowed including polishing and/or tapping. |
3.7 | You may add material to the inside of the wheel to aid in balancing |
3.8 | Wheel covers may be used only if the entire wheel is visible |
3.9 | The following wheel modifications are prohibited: |
Wheels will be checked with a digital caliper and a post race inspection including removing wheels from the car if needed. The race director's decision is final
4 Axles
4.1 | Minimum axle diameter is .084 |
4.2 | Nail type axles are the only axles allowed (BSA, DerbyWorx, Derby Evolution, Jewkes, ect.) |
4.3 | Modification of the axles and grooving is allowed as long as the journal portion of the axles (the part the wheel rides on) is no less then .084 diameter. Axles must have a nail style head, headless axles are not allowed. |
5 Lubricants
5.1 | Approved lubricants includes (but is not limited to) graphite, Teflon, nyoil, and krytox. |
5.2 | Over application of lubricant which results in excessive shedding onto the track surface is not allowed. |
6 Reasons for disqualification
6.1 | Failure to meet race requirements and/or rules |
6.2 | If any part of the car interferes with another car |
6.3 | If your car leaves it's lane and interferes with another car |
6.4 | If your car is causing damage to the track or stop section |