PREPARATION OF RACE CARS

All glass, windows, original seating, loose wiring, lights, steering locks, roof cloths, loose fittings or any inflammable material must be removed.

Any engineering preparation work carried out to cars must be to the highest standard as determined by scrutineers.

Windscreen

Windscreens must be removed unless laminated, in which case a proper working wiper / washer system must be fitted. This may be tested at scrutiny.

Visors or windscreens must have the drivers full name clearly printed at the top to aid commentator in identifying drivers.

No other graphics are permitted on windscreen.

A central vertical bar of 25mm round or 25mm square hollow steel must be fitted, in the middle of the windscreen, securely attached at both ends

Rear view mirrors must be fitted to all cars.

Roll cage

A 6 point tubular roll cage must be securely fitted and be at least 2” above the drivers head with helmet fitted.

All piping to be steel and must have a min 30mm outside diameter

of minimum 3mm thickness and must have 4 anchor points on the floor and two to rear body work or wheel arches with a steel base plate of 3mm thickness welded to the cage, and bolted or welded to the floor and/or sill.

If bolted a minimum of two 10mm bolts per plate.

All welds on cage must cover a minimum of 75% of circumference.

Typically 1 inch gun barrel tubing is minimum suitable for manufacture of roll cage.

Aluminium or alloy roll cage not permitted.

“Box” section roll cages not permitted.

A side impact bar must be fitted inside the driver’s door.

A diagonal bar behind the seat may be fitted in either direction.

Horizontal bar behind drivers seat is compulsory.

Floor bars under seat are optional.

Roll Cage Option A:

 

Front View A

 

Rear View A

 

Roll Cage Option B:

 

Front View B

 

 

Rear View B

 

 

This is the minimum requirement roll cage. The Red bars in option A and the Black bars on option B must be positioned as shown. Bars shown in Green are highly recommended. All welding must be to a high standard as deemed by scruiteers.

 

 

 

 

Sample Pictures
 

Wheel arches are to extend outside or be flush with tyre wall and be presentable and safe with no sharp edges. No flimsy or loose fitting arches will be permitted. Wheel arches must be steel or factory made.

Towing eyes

A clearly marked towing eye must be fitted to the front and rear of race cars. It must be strong enough to enable disabled car to be towed from track.

Front protection

Protection of not more than 40mm steel box section, angle or tube

may be fitted between front chassis legs. One 25mm steel box section, angle or tube may be used to extend between the top of the wing to hold them in place. This bar may be braced from the top of the valance or the valance may be braced from the bulk head or roll cage, but under no circumstances can both be used, as a section of the car must remain collapsible.  (See figure 1).

Class 4, 5 and 6 space frames are exempt from this.

 

Thin metal sheet metal similar thickness to that of original car bodywork or “Hot rod folded” fronts may be used to cover front of car. (Max 1mm in thickness).

 

Rear protection

This is optional but if used must be no more than 40mm box section, angle or tube.  This must not be connected to the roll cage (see figure 1).

 

Bonnets

Bonnets must be secured with pins or similar to allow easy removal in emergency.

Nuts / bolts not permitted as they cannot always be removed quickly.

Lightened bonnets must be secured at all four corners.

Original bonnet catches must be removed.

 

Wiring

Wiring must be properly fitted, safely routed and insulated throughout the car. Where unused wiring cannot be removed due to complexity of ECU and management system it must be secured with cable ties and tape and all unused wire ends safely insulated. Grommets are recommended where wires go through body panels to prevent chaffing and short circuits.

Wheels

Mud flaps must be fitted on rear wheels for racing on loose surface or grass only.

Hub caps must be removed.

Tyres

See Class Rules

Fuel

Only standard pump fuel allowed.

Brakes and steering

All cars must have efficient brakes on all wheels. Brake tests will be carried out from time to time as part of scrutiny.

Brake lights are compulsory, and must be operable from the pedal switch only.

Steering must be in good condition with no undue free play.

Batteries

Batteries must be securely fitted and covered with a liquid absorbent material properly affixed to the top to absorb acid spillage in the event of a roll.

Those fitted in the cockpit must be enclosed in a plastic or metal box to prevent acid spilling on the driver in the event of a car

overturning.

Batteries inside a plastic or glass fibre box must have separate restraint bracket bolted through the floor and must not rely on the strength of the box alone to hold it in event of an accident.

Sealed/Gel batteries need not be covered.

Petrol tanks

No additives allowed. Testing may be carried out from time to time.

A purpose built tank if used must be of metal (stainless steel, mild steel, or aluminium)

If a plastic tank is being used it must be the original car tank. Max of 10 litres to be carried at any one time.

All connections to the tank must be leak free and secure.

The overflow/breathing system must be outside & underneath the car.

All petrol pipes within the car must be of sufficient material with no joints inside the cockpit.

Petrol caps must be properly fitted with no leaks. (With the rubber O-Ring)

Plastic “Flexicaps” cannot be used under any circumstances.

Electric fuel pump may be used on carburetor engine in lieu of mechanical pump.

Any car observed to leak petrol while racing will be black flagged. Petrol leaking from a car can result in severe eye injury to following drivers as well as cause a major fire or skid hazard on the track.

Tanks must be securely fitted.  If inside the car it cannot be fitted on passenger side floor but must be behind driver or below floor.

All extra fuel being carried must be in an approved container clearly marked “highly flammable petroleum spirit” and fitted with a screw or other safety cap. The maximum capacity of this is 25litres.

When refueling the driver must vacate the race car and engine must be switched off.

Where a small tank is located inside the engine bay a fire extinguisher should be available when refueling in case of spillage onto hot exhaust or engine. It is recommended that engine be allowed to cool for a few minutes before refueling a tank adjacent to engine.

Water pipes

All water pipes within the cockpit must be of metal or reinforced rubber material, metal piping must be insulated. Joints must be kept to a minimum, ideally only at radiator or within engine bay. All hose joints must be secure and leak free

If radiator is located inside the car it must be behind the driver and have a shield to protect the driver from splash or steam from radiator cap.

Mid mounted engines

Any car fitted with a mid mounted engine must have a steel wall between it and the cockpit. Particular attention must be given to this where chain-drive is used.

Doors

Where driver’s door can be opened a secondary locking system of a spring loaded shooting bolt must be used.

Welded door is optional but if used the passenger door must be cut down to the level of the door handle to allow access in case of emergency. In this case there must be minimum obstruction such as water pipes etc. in passenger side of car.

The original locks may be removed. This applies to both doors. Mesh must be fitted to the driver’s door of plastic or webbing material. This must be fitted securely to prevent the drivers arm from extending out in the event of a rollover. Cable ties or similar should be used to enable it to be removed in emergency to gain access to driver in event of an accident.

Boot doors if remaining must be secured with a secondary fastening.

Seating

Competition type bucket seats are compulsory and must be securely fitted. Loose or badly fitted seats will be rejected at scrutiny. Stock Rod class are exempt to this rule. 

Harness

A full racing harness (min. 4 point) which complies with BS.3294 must be fitted using original mount points where possible.

Alternative mounting points may be fitted using min 3mm plate 50mm sq fitted below the floor at mounting points using minimum 10mm (M10) bolt to secure.

Drivers must be capable of starting and stopping the car with the harness securely fastened and pulled tight.

 

Engines

  • Engine oil pumps, oil filter system and sumps may be altered at the driver’s discretion.
  • Modifications permitted to engine and gearbox mountings.
  • Improved air filtration system can be fitted.
  • All engines must tick over at normal idle speed,
  • Cars ticking over at too high a speed will not be allowed race until it is reset to the proper speed.
  • Cars must have adequate silencing as agreed by scrutineer and committee, at least one silencer must be fitted.

 

Racing numbers 

Doors

Racing numbers must be displayed on both sides of the car. Minimum of 12 inches in height.

Font size or type is free but must be clearly legible and contrast with background colour. Committee decision will be final in this regard if there is any doubt.

Roof

Racing numbers must be clearly legible and displayed on centre line of roof (with a min height 6” numbers on a mounted plate, white on black or black on white). 2 fin plates can also be used.

Cars not displaying roof numbers or with incorrect roof number may not be recorded by lap recorders and as such may be excluded from prize winning or championship points.

Class Number to be displayed on visor or windscreen.

Advertising

Advertising on race cars is permitted and is encouraged; the committee will have discretion to prohibit any graphics or text that is considered unsuitable or offensive. Advertising or other graphics must be professionally printed or applied.

Presentation

Cars must always be in a clean and presentable condition. Cars arriving at scrutiny with excess mud or dirt from previous event will not be permitted to race until car is washed.