2.7. Openings may be made in the bonnet or boot lid for ventilation providing they do not make mechanical components visible.
2.8. The Bodywork must be of the vehicle manufacturers specifications and minimum thickness with the exception of airboxes, radiators, front wings, rear wings / rear quarter panels and removable parts and panels, which may be of alternative materials. Seam welding, and localised gussets / reinforcement is permitted.
3. Engine
3.1. The engine may be modified but the block must be from a mass-produced engine and must have the same number of cylinders as the original mass-produced engine for that Vehicle.
3.2. Specialist Competition Engines as defined in Ch. 1 App. 1( Nomenclature and Definitions) are also permitted.
3.3. The engine must be located within the original engine compartment. 3.4. Twin engine configurations are not permitted unless mass produced in that form.
4. Oil Systems 4.1. Oil systems must have catch tanks fitted.
4.2. Any oil tank located outside the chassis or main structure of a Vehicle must be covered with a protective coating( eg GRP)
5. Fuel Systems
5.1. These should be equipped with an effective method of stopping fuel supply which can be operated by the Driver when seated normally with seat belt secured.
6. Transmission 6.1. Transmissions can be modified.
6.2. The clutch and its control are free but automatic operation of the clutch is prohibited unless fitted by the manufacturer to that body style. The clutch must be operated by the Driver’ s feet, unless an alternative method of operation is fitted by the manufacturer to that body style. Modification for disabled Drivers permitted in accordance with Ch. 7 App. 2 Art. 3.
6.3. The final drive assembly, differentials, propshafts and driveshafts are free. Electronically-controlled systems are prohibited.
6.4. * The Official Documents may require four-wheel drive Vehicles to be subject to some form of handicap( not necessarily a delayed start).
7. Electrical Systems
7.1. Vehicles should be equipped with an ignition cut-off switch, having a clearly marked and positive ON – OFF position, which can be operated by the Driver when normally seated with seat belt secured. It must also isolate electric fuel pumps.
7.2. Any forward-facing lamps of more than 32 sq cm surface area must be adequately protected against glass breakage.
7.3. All lights may be removed but all Vehicles must be equipped with two rear red warning lights to be used in fog, with a minimum of 15W each and an illuminated area of 60 sq cm. These must work with or replace the car brake light system at all times, must be between 1150mm and 1500mm above the ground and must be clearly visible from behind.
7.4. Generators are optional but a self-starter system must be operable at all times.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 16 Part B( Rallycross) Appendix 10- Technical Regulations 593