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Note:  Some people have inquired about using racing tires in lower speed classes.  Given that racing tires are far more susceptible to puncture, we would recommend using an appropriate street tire.  We see no reason, however, to disallow the use of racing tires in lower Divisions, but strongly recommend that extra care be taken when using such tires.  If you plan to use non-DOT racing tires in ANY division, contact MKM or the Chief of Tech for prior approval, well before the event, or risk being turned down at Tech Inspection!

FUEL & FUEL EQUIPMENT RESTRICTIONS
 

1. Power Adders: defined as either a Nitrous Oxide injection system or an add-on (non-OEM) supercharger or turbocharger. (Note: for Motorcycle Unlimited, any supercharger or turbocharger, even OEM equipment, counts as a power adder.) No power adders are allowed in Pure Street.  For other Divisions, see the division requirements. When counting power adders, please note that for multi-stage systems, each stage is considered to be one power-adder. For example, a two-stage nitrous system counts as two power adders. Tandem or series super/turbocharging works the same way; for example, one turbo feeding into another, would count as two power adders. A twin-turbo engine with each turbo feeding a separate group of cylinders, however, would only count as having one power adder.
    
2. Nitrous Oxide systems must incorporate an arming/disarming switch within easy reach of the driver/rider, and a throttle-operated switch set up so that the system will only function at the fully-open throttle position. The system must be wired such that it shuts off with the ignition switch and/or kill switch. It is recommended that oil-pressure and fuel-pressure safety switches also be wired in series with the arming switch. Nitrous purge valves and blow-down tubes must vent outside the vehicle. Maximum of two 10-lb. tanks or one 20-lb. tank allowed. Tanks must be clamped in securely mounted metal brackets made for that purpose; no hose clamps, plumber’s tape or other crude mountings allowed. All plumbing for the system must be rated for the pressures used, with steel lines or braided-steel hoses highly recommended.
    
3. Positive displacement superchargers (i.e., Roots-type blowers) must be equipped with pressure relief valves and/or burst panels to reduce damage from any backfires that may occur. Retaining straps for the blower are highly recommended.
    
4. Fuels: For divisions except Unlimited: up to 100 octane pump gas allowed. For Unlimited: up to 114 octane race gas allowed.  Nitromethane, propylene oxide, or similar exotic fuels or additives are strictly prohibited.  Octane boosters such as "104" are permitted if less than 2% of the total gasoline volume. Diesel fuel is allowed in all divisions for suitable vehicles. E85 is approved for all divisions. Pure alcohol (ethanol or methanol) must have prior approval of MKM. Other fuels may be permitted at the discretion of MKM if proper application is made prior to the event. Compressed gas fuels such as Propane, LPG, CNG, Methane, Hydrogen, etc. are not allowed without special permission, except that a Propane Injection system is permitted as a Power Adder for diesel-powered vehicles in a division where power adders are allowed. Such a system must have the propane tank securely mounted outside the passenger compartment in a ventilated area.  Water or Water/Alcohol injection systems for detonation suppression are allowed except in Pure Street, but they must be declared to the Tech Inspectors, who will inspect and possibly seal the tank.
    
5. No fuel may be carried in the vehicle in any container other than the gas tank or fuel cell.
    
6. Any open compartment or “hatchback” style vehicle must incorporate a physical barrier between the fuel tank or cell and the passenger compartment. Lexan may be used if this barrier could impede rear visibility. It is strongly recommended that you consult with the Chief Technical Inspector or the Race Director prior to installation.