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| W Class will run engines with Bore and Stroke/Weight limit rule. R Carbureted or Fuel Injected Engines will be limited by ¾ inch restrictors, 600cc maximum and 750 lbs minimum. N Class will have 640cc maximum engine with 750 lb. minimum weight. KidSprint rules will be the Briggs World Formula as posted on the website. The only changes chassis wise is Aluminum rear axles are now legal. |
| Engine Size | Wing | Cockpit Controls |
Tire Specs | Weight |
| 600cc | 10 Sq 24x48;18x48 Sides |
1 | Open | 750 |
| 600cc | Any | Any | Open | 775 |
| 620cc | Any | Any | Open | 800 |
| 640cc | Any | Any | Open | 835 |
| An affiliated track may run a local class such as Stock 600, 250/270 Single or Sportsman. These Local Option classes will not qualify for National Points Championships. |
| The 600/750 lb and the R class are limited to the 10 Sq Ft wing with sideboard as stated above. No nose wings allowed in N Class. No cockpit adjusters in the R class. The wings in the other engine sizes must be within the outer edges of the tires as the racecars sits on the scales and behind the front edge of the front bumper and in front of the rear edge of the rear bumper. Wing construction is of aluminum with wood spars allowed. No carbon fiber or fiberglass other than the leading edge of the center foil. |
| R and K Classes will run the NMMA Spec Right Rear Tire. W and N tire rules are open and allow Grooving and Sipeing. Maxim tread width: 63” outside to outside of rear tires. K class max tread width: 48” outside to outside of rear tires. |
| Wheelbase: 50” to 70”average C/C of front to rear axle. Main Chassis rails (Main Perimeter Tubes and Cage hoops) min. Chromoly 1x.065 or Mild Steel CREW 1x.083. Appearance to resemble a Sprint Car. Body panels not to extend more than 1” beyond any frame member. Legible numbers on Wing Nose and Tail for easy scoring purposes. |
| For liability reasons the following are recommendations for affiliated tracks. Five point driver restraint system with 3 year limit from punched build date (month and year). One or two piece full coverage from neck to ankles uniform and gloves with a minimum SFI3.2-1 rating or greater and also recommend nomex underwear, socks and headsock. Full coverage competition helmet with one of 3 last Snell Ratings recommended. It is highly recommended a form with the checklist of the DC-14 be used to inspect racecars by affiliated tracks. |
| Gasoline will be VP C-12 or Sunoco Purple or Methanol or Ethanol….NO ADDITIVES. Fuel test will be by Digitron approved methods or any 600 MicroSprint USA method. |
| KidSprint: 6 to 12; Restrictor: 10 and up; N&W: 14 or 12 with one year previous R experience. |