Modified Class Requirements 4×4

Posted on Leave a commentPosted in 4X4's, Landrover Club, Range Rover
The following changes from the Standard Class Regulations are permitted in this class:-When optimising a road-legal vehicle for off-road use, owners may need to take advice on the suitability of any alterations to establish that they are not detrimental to safety for public road use, and that the terms of the vehicle’s insurance are not contravened.C.1.   VEHICLE DIMENSIONS
C.1.1. All dimensions given in the Vehicle Sizes Chart shall apply.

C.2.     STEERING.
C.2.1.   Power steering may be fitted to any model, using parts from any other product listed in A.2. Points of attachment may be strengthened where necessary.

C.3.     ENGINES.
C.3.1.   Any Land Rover or Rover car engines (and others with Rover part numbers) up to a Max of 4600cc may be used complete with their ancillaries subject to A2.
C.3.2.    Carburetors may be changed; air intake system and manifolds may be altered to any specification.
C.3.3.   Engine location and orientation is free on condition that the forward facing part of any engine block (the main cast structure and not ancillary equipment / bolted-on parts) shall be forward of the midpoint of the wheelbase of the vehicle.
C.3.4.      Forced induction petrol engines are not permitted.

C.4.1.      The transmission type and its location are free, provided the transmission consists of parts that have Land Rover / Rover part numbers or equivalent cross-references.

C.5.1.      Any Land Rover suspension system and components may be used on any model and the suspension mounts modified to accommodate the components, the use of air suspension is prohibited except in classes and periods where fitted as original equipment.
C.5.2.      Any axle types may be used (provided they have Land Rover part numbers or equivalent cross-references).
C.5.3.      Coil assisters (where the coil is separate from the shock absorber / damper) may be fitted to a leaf-spring vehicle. The suspension system shall then be deemed to be a coil-spring type and not a leaf-spring type.
C.5.4.      Bump-stops must be fitted in the appropriate location and must be complete factory-specification items that match either the chassis or axles in use.

C.6.       DAMPERS.
C.6.1.      Additional dampers may be fitted.

C.7.         BRAKES.
C.7.1.      Any type of braking system may be used except fiddle brakes.
C.7.2.      Bias braking (front to rear) is permitted but the ability to alter the settings from the driver / passenger compartment, or whilst the vehicle is being driven, is prohibited.

C.8.     CHASSIS

C.8.1.   The chassis may be modified from one or more original Land Rover chassis or one(s) of Land Rover design maintaining a chassis rail separation of Land Rover Ltd design specification. The profile and rectangular cross section above and between the axles must remain as the original.  All welding on the chassis must be of a high standard.

C.8.2.   Rail, space-frame or monocoque chassis construction may be used where factory fitted to that model.

C.9.1.     The radiator may be fitted in any suitable location within the confines of the original silhouette. Coolant hoses and pipework may be re-routed but must be separated from the driver / passenger compartment by means of lagging (if metal pipework) and a solid metal cover (if rubber pipework) to protect all persons including marshals and spectators.
C.9.2.     All pipework, header tanks etc. shall be covered to protect occupants, marshals and spectators should any part of the cooling system fail and cause water or steam to escape.
C.9.3.     The radiator shall be shielded from the driver / passenger compartment regardless of its location. Louvre vents are acceptable as radiator shielding.
C.9.4.     The cooling fan(s) must be protected by a grille, Louvre or similar.

C.10.       FUEL TANKS.
C.10.1.    Fuel tanks may be changed or repositioned but must be securely fixed in place and be of metal construction. Plastic or composite fuel tanks are permitted only where they are factory fitted to that model and mounted in the original position.
C.10.2.    If non-standard fuel filler is used, it must have a leak-proof cap, and be isolated from the driver / passenger compartment by the best possible method commensurate with the vehicle design. Under-seat lids shall be screwed down with a gasket. The very minimum protection for an early under-seat filler is the cap separately sealed. The fuel filler cap must be located in a safe place. Fuel tank air vents must be at least 25cm to the rear of the cockpit and must be designed to prevent the escape of fuel should the vehicle be inverted. It is recommended that a non-return valve is incorporated in the vent system. (See MSA Yearbook 2006 reg Q.6.)

C.11.       BUMPERS
C.11.1.    Heavy duty bumpers, and bumpers associated with winch installations are permitted on condition they are no smaller or weaker than the originals.  See Logbook article Dimensions Chart for bumper widths. (Rules B.12.2 and B.12.3 do not apply in Modified vehicles)

C.12.       SILHOUETTE.
Definition:- The “body capping line” on a “Series” Land Rover or Defender is defined as a horizontal line level with the top edge of the
fixed rear load area surround. The “window line” on Saloon / Station Wagon types is level with the bottom edge of the driver’s door
C.12.1.    The body parts above the “body capping line” or “window-line” (as defined above) may be removed.
C.12.2.    The silhouette (as viewed from the side and front) of the bodywork below the “body capping line” or “window line” (as applicable) must be retained. The chassis, fuel tank etc. are not considered to be part of the silhouette.
C.12.3.    Sill panels may be removed and wings cut away, provided they present no sharp edges. Inner faces of the wings (those either side and forward of the radiator panel on a Series Land Rover) shall remain leaving the silhouette of the body unaltered.
C.12.4.    Bodywork may be replaced with non-Rover items on condition that all other shape / dimension specifications above are adhered to




Road Taxed Vehicle (RTV) Trial – Specific Technical Regulations
E.1.     BODYWORKRule C.12. states which part(s) of the bodywork may be removed. However, in this class, the following applies:-E.1.1.  All vehicles must be in one of the following two configurations:-
E.1.1.1.   Soft-top vehicles – must have the manufacturer’s windscreen raised, and complete manufacturer’s hood and support structure in place. The rear flap on the tilt may be secured open.
E.1.1.2.   Hardtop vehicles must have the whole of the manufacturer’s hardtop or truck cab with all fastenings secured and all glass in position.

E.1.2.      Door tops must be in place complete with all glazing panels in place.
E.1.3.      The tailgate must be in place and secured closed.

E.2.         TYRES & WHEELS
E.2.1.   Vehicles must be entered on their normal road tyres which must be UK road legal for the vehicle on which they are fitted.
E.2.2.   Aluminium wheels and matching nuts may be used in place of factory-fitted steel wheels where suitable hubs are fitted. (See Scrutineering Guide in the ALRC Handbook for details on identification of suitable hubs.)
E.2.3.   Minimum tyre pressure to be 22 psi.
E.2.4.      Spare wheels and tyres need not be carried. (See MSA Yearbook 2006 H.36.7.2.)

E.3.         SEATS & SEAT BELTS.
E.3.1.   Seat backs and squabs must be secured to the vehicle structure at least as securely as originally manufactured unless originally manufactured with no securing devices.
E.3.2.   Vehicles must have a minimum of lap and diagonal seat belts fitted and worn by both driver and passenger. This is to apply even if the vehicle does not require seat belts for use on the public road. A properly fitted 3-point (or better) safety harness is an acceptable replacement for the standard seat belt. Lap belts only are required on Series vehicles up to 1965.

E.4.1.   It is recommended that all competing vehicles carry a fire extinguisher, minimum 1.75 litre AFFF or equivalent extinguishant / weight as specified in the MSA yearbook, operable or accessible from the driver’s seat.

E.5.         FUEL TANKS
E.5.1.   Where the fuel tank and filling system are unaltered from the original design, a standard filler cap may be used unless event SRs state otherwise. See also rule C.10.2.