[SCCA] Solo II Miscellaneous Rules

This is an unofficial transcription of portions of the 2004 SCCA National Solo Rules. (Copyright Sports Car Club of America 2004; all rights reserved;) It is believed to be correct, but any questions should be referred to the official rules as published by the SCCA. Order your own copy here.

Text changed from the 2003 Rules look like this.
Text changed from the 2004 Rules look like this.


  • 1.1 Mandatory Provisions
  • 3.3.1 Driver Restraints
  • 3.3.2 Roll Bars
  • 3.3.3 Safety Inspections (Tech Inspections)
  • 3.6 FUEL
  • 4.3.1 Helmets
  • 15.6 (Prepared category) Brakes
  • 1.1 Mandatory Provisions

    Sections 1 (all), 2., 2.1, 2.3, 2.4, 3.1, 3.3, 3.6, 4.1, 4.3, 5.2, 5.3, 5.4, 5.5, and 5.8 are mandatory in all Solo II Events that a Region solely or jointly organizes, conducts, sanctions, or otherwise cooperates as a Region in organizing.  The titles of mandatory sections are underlined herein.  Vehicle classifications are not mandatory, and Regions should use classing structures which are best for the development of their own programs.  National vehicle classifications are located in Appendix A of these rules.  Suggested optional classes and rules are located in Appendixes G, H, and J.  The entire SIIR are mandatory for Divisional and National Solo events.  Additional rules governing the ProSolo NationalSeries are in Section 18 (should be 19 -- Ed.) of these rules.

    3.3.1 Driver Restraints

    Seat lap belts are required in all cars, and must be installed in cars with passive restraint systems which do not include a lap belt. Installation of shoulder belts or harnesses is strongly recommended, however non-factory upper body restraints systems may only be used in open cars, cars with targa-tops in the open position, or cars with T-tops in the open position when two conditions are met: 

    1. The roll structure must meet either the requirements of Appendix C ro Section 18 of the GCR.
    2. The top of the roll structure may not be below the top of the driver's helmet when the driver is in the normal driving position.

    3.3.2 Roll Bars

    Roll bars or roll cages are strongly recommended in all cars. A roll bar meeting the requirements of Appendix C, or a roll cage meeting the requirements of Section 18 of the General Competition Rules (GCR), is required in all A, B, C, and F Modified vehicles, and in open cars in Prepared Category, and in D Modified and E Modified.  The intent of this requirement is that all open cars using racing slicks must at a minimum have roll bars which meet Appendix C, regardless of Regional variations in category definitions and/or preparation allowances.  For open cars in the Stock, Street Prepared, Street Touring and Street Modified Categories, the roll bar or roll cage height may be reduced from Appendix C or GCR Section 18 requirements to the highest possible height which fits within a factory specified hardtop or convertible top. 

    Double-hoop roll bars must fasten properly to the chassis/unibody as required in Appendix C, particularly at attachment points in the center of the car.

    3.3.3 Safety Inspections

    (sometimes called Technical, or Tech inspection; Ed.)

    All vehicles must pass safety inspection on the following points prior to competing.  Entry fees, if already paid, will be refunded if a vehicle fails to pass safety inspection. Safety inspection is not concerned with the legality of a car.  

    The organizing Region may at its discretion provide an advisory inspection for vehicle classification and legality, in connection with technical inspection.

    1. Annual Inspection

      An Annual Safety Inspection for a calendar year will be available for vehicles presented for inspection by an SCCA member. When a vehicle has completed the requirements for an Annual Safety Inspection, an official Annual Tech card will be issued to allow Registration or other designated event officials to verify Annual Tech prior to the start of competition.  An official Region SAAC Annual Tech sticker shall be placed on the vehicle in a location that will be visible to the starter when the vehicle approaches the start line for a competitive run. If the Annual Tech sticker has been removed, the card may be used to obtain a replacement.  Alternatively, individual event tech stickers can be issued when the Annual Tech card is presented rather than the issuance of an Annual Tech sticker.  The Annual Tech should be honored for all SCCA sanctioned Solo II events.  The following conditions apply to all Regional implementations of annual tech:

      1. Regions have the option of placing additional restrictions on the Annual Tech process, such as limiting the classes allowed and/or restricting it to experienced drivers.

      2. The Annual Tech Inspection must be conducted by an experienced inspector appointed by the regional Solo II chairperson.  It is strongly recommended that the Regional Tech Inspector appoint and train an adequate number of assistants. 

      3. The SCCA member presenting the vehicle for inspection is required to possess a current copy of the National Solo Rules.

      4. The vehicle should be presented for Annual Tech in the same condition in which it will compete.

      5. It is the responsibility of all competitors in a vehicle with an Annual Tech to verify that all items in 3.3.3.B are in compliance.

      6. The event technical inspector or chairperson may require a vehicle be presented for a re-inspection if there is good reason to believe that a vehicle is not in compliance with the sections of 3.3.3.B.

      7. A vehicle must be re-inspected if modifications are made to the car after receiving an Annual Tech approval.

    2. Inspection Requirements
      1. All loose items, inside and outside the car, must be removed.  Passenger's seat back and squab shall be secured.  Video cameras must be securely mounted if installed.
      2. Snap-on hubcaps, detachable fender skirts, and trim rings must be removed.
      3. Wheels must be safely affixed.  They shall not be reversed so that the lughole taper does not mate with the chamfer of the lugs.  All studs and lug nuts must be present and functional.
      4. Tires must be in good condition, with no cord or belts showing or cracks in the tread or sidewall. Each tire must have measurable (i.e. exhibiting positive measurement values) tread depth at no less than two points on the tire which are 180 degrees apart around the circumference, and which are within the center one-half of the tread surface that normally contacts the ground. Tires may not have cord visible at any time during competition. Tires may not be re-grooved, nor may grooves be added to the tread pattern where none existed on the original tire.
      5. Seat belts (and harnesses if used) must be properly installed with attaching hardware, in good condition, secure, tight, and in compliance with 3.3.1.
      6. Throttle return action shall be safe and positive.
      7. No excessive fuel, oil, or brake fluid leaks should be observed when the engine is running.  For all Prepared and Modified category vehicles, engine crankcase and radiator overflow/breather lines must terminate in containers of at least one quart capacity.  These containers cannot be vented into the driver/passenger compartment.  All Prepared and Modified category vehicles must be equipped with an engine oil vent tank, and an engine coolant vent tank if coolant is used. Vent tanks are not required with systems which are completely closed, i.e. having no venting to the atmosphere.  All oil lines passing through the passenger compartment shall be made of metal braided hose with AN Series threaded couplings; or entirely covered and protected with a metal cover (this does not apply to the small oil lines used for mechanical oiling system gauges).
      8. Steering "spinner" knobs shall not be permitted.
      9. No broken or missing spokes or more than one loose spoke per wheel shall be permitted in wire wheels.  No cracks shall be permitted in disc or cast wheels.
      10. Brakes must have an adequate pedal, sufficient fluid in the master cylinder, and no apparent hydraulic leaks under pressure.  Vehicles must have a brake mechanism acting on each wheel. Karts are exempt this requirement.
      11. All swing axle cars, except Porsche, must have a camber compensator, or negative camber on the rear wheels, or have axle-limiting straps.  Stock pre-1967 Volkswagen straps are not sufficient.
      12. Wheel bearings, shocks, steering, and suspension shall be in good operating condition.
      13. Exhaust must exit behind driver or to the side of the car.
      14. On board starters shall be provided
      15. Any wet-cell battery moved from the manufacturer's original location shall be in a non-conductive marine-type container or equivalent, and the hot terminal shall be insulated.  All batteries (on-board power supplies) shall be attached securely to the frame or chassis structure independent of the marine-type container.  NOTE:  This will allow the use of gel-cell or dry-cell (AGM) batteries without a non-conductive marine-type container where applicable.

      16. NOTE: This will allow the use of gel cell batteries without a non-conductive marine-type container where applicable.
      17. Roll bars, if installed, must meet the applicable portions of Section 3.3.2 and Appendix C, with specific attention to roll bar height.
      18. Helmets for all occupants of the vehicle are to be inspected for condition, fit, and compliance with Driver's Safety Equipment - Helmets (4.3.1)
      19. Flex fans are not allowed.

    3.6 FUEL

    1. Stock and Street Touring Class vehicles will use service station pump fuel only.  Pump fuel is defined as that which is "Federally approved for use on public highways".  This does not allow racing-type fuels which are available at service station pumps.
    2. Street Prepared, Street Modified, Prepared, and Modified class vehicles may use any grade of gasoline.  Gasolines consist entirely of hydrocarbon compounds.  Gasoline may contain antioxidants, metal deactivators, corrosion inhibitors, and lead alkyl compounds such as tetraethyl lead. Oxygen and/or nitrogen bearing oil additives are prohibited in two cycle engine oiling systems.
    3. Propane or CNG (compressed natural gas) fuel may be used in any category provided that the following conditions are met:
    1. The tank must be located in a safe location on the car, and be firmly and securely mounted.  This does not permit the cutting of vehicle sheet metal, e.g., the trunk floor, for tank installation in Stock, ST, SP, or SM.
    2. The tank must conform to Federal and local container standards, and have an emergency relief/cut-off control.
    3. For use of propane or CNG as fuel, no changes to the induction system of the engine may be made with the exception of the necessary fuel lines to the carburetor or fuel injection.  There may be no other engine parts changed.
    4. The entire system must meet local ordinances covering the use and transmission of compressed gas.

    4.3.1 Helmets

    Helmets meeting the following standards must be worn while on course.  All helmets meeting the current or two immediately preceding Snell Foundation standards (SA, M, or K) are acceptable.  For 2003 this includes Snell 2000, Snell 1995, or Snell 1990.  FIA approved helmets which are acceptable for use in Performance Rally events are acceptable for Solo II events.  See Appendix G for Kart helmet rules.

    For maximum protection, helmets must fit securely and should provide adequate peripheral vision.  The chin strap must be securely fastened.  Loaner helmets should be available to vehicle occupants not having their own.

    17.6 (Prepared category) Brakes

    1. Brake rotors/drums shall be located in the original position, (e.g., inboard vs. outboard).  The type of brake is unrestricted (e.g., drum brakes may be replaced with disk brakes).  There is no allowance for converting the parking brake actuation mechanism to one of another type.
    2. Brake rotors, drums, and calipers are unrestricted except that they must be made of metal, (e.g., no carbon fiber rotors)
    3. Any dual brake master cylinder(s) may be fitted.
    4. Any pressure equalizing or proportioning devices are permitted.
    5. A servo assist may be added, or a standard servo assist may be modified, removed, or replaced.
    6. Any brake pads and/or linings may be used.
    7. Any brake lines may be fitted.
    8. The hand brake and operating mechanism may be removed.
    9. Brake Ducting
      2. Brakes may be cooled by the ventilation of backing plates or the fitting of air ducts, provided no unauthorized changes are made in the bodywork for this purpose.
      3. Front mounted ducting shall not extend to the side beyond the bodywork, nor forward of the forward-most part of the front body panel or spoiler/air-dam.
      4. Rear brake ducts shall extend, in a forward direction only, no more than 24 inches from the rear brake discs/drums.
      5. Disc brake dust/splash shields may be altered or removed.
    10. Active Automatic Braking Systems (ABS)  may be removed in their entirety.  If retained, they must be the OE system installed on the vehicle and must be unmodified. 
    11. Traction and Stability Control Systems and devices  may be removed in their entirety.  If retained, they must be the OE system installed on the vehicle and must be unmodified. 

    ...Jerry Mouton || jerry@moutons.org || Last modified 03/19/04