Drivers racing in Formula Mini Stox must accept that it is a full contact formula, but that contact is only permitted front

to back. Attacks on other parts of the car will be punished by the Steward/Board of Control. Gentle side to side contact

in the normal course of racing would be considered acceptable.

No car must go onto the circuit to race or practice until it has been scrutinised by an official scrutineer and the driver

has had his/her logbook signed.

It is the driver’s responsibility to ensure that his/her car has been scrutineered before it goes on to the circuit.

Scrutineers will check cars and engines at any time and at any meeting. Drivers with unsafe cars will be warned as to

the standard of build / maintenance and may be given a chance to bring the car up to standard.

Whilst every care will be taken during the scrutineering process officials cannot be held responsible for any items

contained in these rules being missed. If your car has been passed by a scrutineer it does not mean that it complies fully

with all items in these rules. However, the scrutineer does have the final say as to the construction, safety, and

suitability of any car.

The scrutineers may at any time request holes to be drilled to ascertain the thickness of steel tube, box section or plate

All welding should be first class and must reach a level that satisfies the scrutineers.

Mini Saloon, Clubman, all steel Travellers, vans or pick-ups are acceptable. Where vans are used the side panels may be

cut out as a Traveller. Cars and bodies must retain their original appearance. Fibreglass fronts (bonnets and wings) are

allowed.

A Formula Mini Stox car must remain standard in as much as length, height and width.

The weight limit for FMS cars is 625kg – 700kg.Cars may be weighed at random.

All the cars interior and exterior must be stripped of all original combustible material, glass and trim.

The car must have a full metal floor fitted from the rear of the front sub-frame to the front of the rear sub-frame and be

the full width of the car. This floor is to be securely bolted or welded in place and be at least equivalent to an original

mini floor.

The steering column, brackets and all cross-members in the vicinity of the driver shall have all sharp edges removed

and must be effectively padded to avoid leg injuries.

The speedo aperture and all other holes in the bulkhead must be covered over so as to complete a firewall between the

engine compartment and the driver.

A 3” hole must be provided in the body panels, in the vicinity of the carburettor, to assist in the case of fire.

A steel mesh must be fitted over the full front screen opening with a 50mm x 50mm maximum mesh size minimum

12SWG.

A full metal firewall must be fitted to entirely enclose the battery and petrol tank (including filler) in the rear central

area of the car. This firewall must be complete and be such that it meets the floor, sides and rear of the car and that by

looking into the car you should not be able to see through to the ground.

Aerofoils may be fitted as long as these overall measurements are not exceeded and there is no overhang: -

26” overall height

24” overall length

31” overall width

Front legs to be fitted directly to the roll cage and the rear legs to have feet at least 4” square, unless they are in the

driver area, when again they must be fitted to the roll cage. The frame and legs are to be made from lightweight box or

tube of maximum section ½”.

Protective armouring as detailed in the attached illustration must be fitted in the correct position to ensure even contact

between cars.

The doors and boot must be welded or bolted securely shut.

There must be sides at least 8” plus or minus 1” above the side rails and be so throughout the length of the car on both

sides.

No strengthening bars shall be fitted externally on the centre part of the sides below the side rails. Sides must be

completely flat.

The front bumper must run parallel to the width of the bonnet. Depth of bumper should be 12” minimum 14” maximum.

A fence protecting post to be fitted to both corners of the front bumper and be a minimum of 4” above top rail of

bumper.

A twin rail rear bumper of similar construction to the front bumper to be fitted downwards from the rear side rails,

minimum depth 4” maximum 12”.

Both front and rear bumpers should be angled into the side rails. (Angles to be approx. 45 degrees) – see diagram.

Bumpers and side rails to be constructed of 40mm x 40mm, 25mm x 50mm, 50mm x 50mm – 3mm wall thickness.

(4mm wall thickness is recommended for all new drivers). The use of hi-tensile steel is recommended.

Two bars of a minimum of either 40mm x 40mm, 25mm x 50mm or 50mm x 50mm – 3mm wall thickness must be

fitted underneath both sub-frames of the car and run from the front bumper to the rear bumper. (4mm wall thickness is

recommended for all new drivers).

A 3mm steel plate will be fitted to the area beneath the driver’s seat and will be welded to the under-car connecting bars

or to the roll cage.

All sharp edges must be removed from bumpers and side rails.

No coil-over shock absorbers of any type or spring assisted shock absorbers are allowed. Adjustable shock absorbers

may be used.

Adjustable suspension (hi-lo type) in conjunction with rubber cones are allowed.

Suspension arms and tie bars can be made adjustable but they must be made from steel and out of altered original

equipment.

The use of fully rotating rod-ends (rose joints) is not allowed anywhere on the car except as mountings for steering

columns or as engine stabilisers. They may not be used as performance enhancing parts.

Both sub-frames must remain original types.

Front sub-frame - Must be fixed in the original mountings on the bulkhead cross-member. It is not permissible to cut

and angle the bulkhead in order that the sub-frame can be mounted askew, nor is it permissible to add spacing to the

mountings to achieve the same effect. Tie bar eyes must remain in original position. If the sub-frame is welded to the

front-to-rear under-floor bars you may remove the rear fins and replace the front cross-member with a similar bar

between the front-to-rear under-floor bars. The suspension turrets must remain standard height, the bump stop mounting

plate must remain intact, suspension arms must be fitted in their original mounting positions.

Rear sub-frame – Must be securely fitted to the rear of the car. Adjustable cones, adjustable shock absorbers and

adjustable camber mountings are allowed. The outriggers must remain in place. The back bar of the sub-frame can be

removed providing it is replaced with a bar of equal strength.

Both sub-frames may be strengthened.

No other modifications to sub-frames apart from those listed are allowed.

A full roll cage must be constructed; it will consist of a screen hoop and a hoop to the rear of the driver’s head. There

will be connecting bars in the roof and the sides. Two bars are to be fitted to both sides of the roll cage, one at knee

height and one at floor level. There must also be two bars or a 3mm steel plate fitted above the drivers head. Bars to be

9” apart. Plate to be a minimum of 12” wide by full length of the roll cage.

The roll cage must be an all-steel construction and be made from the following materials: -

All sizes are a minimum.

34mm round tube x 4.5mm wall thickness

38mm round tube x 3.5mm wall thickness

40mm square section x 3mm wall thickness

All sizes above these dimensions are permitted providing the 3mm minimum wall thickness is maintained. The upright

posts of the whole cage must be either bolted or welded to either a sound floor or the front to rear under floor bars.

Extra braces and connecting bars between roll cage and sidebars are to be fitted at the constructor’s discretion. Front

cross-members between side bars and roll cage must be fitted either flush or in front of the roll cage uprights. Care must

be taken to position bars in such a way that they do not make contact with the driver’s legs or body when strapped in.

A full and secure headrest must be securely fitted within 1” of the rear of the driver’s crash helmet when he/she is

strapped in.

A 3mm steel plate will be fitted to both sides of the car or roll cage and run from the side rail height to the top of the

ankle height bar – minimum size 24” x 13”.

Any Rover ‘A’ series engine up to 1300cc as originally manufactured.

You may do whatever you like to the internals of the engine.

No aluminium cylinder heads are allowed.

No engine management systems are allowed.

You can use either Luminition white or black box or equivalent Lucas electronic ignition systems only. The use of any

other system of electronic ignition or ‘magneto’ type distributors will not be allowed.

No forced induction is allowed.

No straight cut gears other than 1st gear are allowed.

No straight cut primary or idler gears are allowed

Only standard conventional operation differentials are allowed although ratios may be interchanged. (No limited slip

differentials, worm drive, torque locked or welded differentials are allowed)

Only a single S.U. carburettor up to 1¾” is allowed. However, you may do as you wish to the internals of this

carburettor.

The original petrol tank must be removed and a replacement metal tank fitted with a metal screw cap (6 litres max

capacity). Overflow / breather pipes must encircle the tank to prevent spillage; all fuel must be drawn from the top of

the tank. The tank must be securely fitted behind the driver and be protected by the firewall.

The fuel lines must be metal although a maximum of 6 rubber petrol pipe joints of 6” maximum length will be allowed.

Alternatively Aeroquip type steel braided hose may be used providing it is fitted with the proper connections. The fuel

line must be routed away from ALL electrical cables. Fuel lines must be securely fixed down.

A fuel shut off tap must be fitted in the line, within easy of the driver when strapped in and must be labelled ON/OFF.

Both mechanical and electrical fuel pumps are allowed.

Only 4 star leaded, LRP or unleaded pump petrol with a maximum octane rating of 101 is to be used.

Aviation petroleum is not permitted under any circumstances. Random fuel checks will be taken and any guilty party

will be responsible for the payment of that sample’s laboratory tests, sealed containers etc. Any guilty party risks a

minimum sixty-day ban.

Radiators must remain within the engine compartment.

Any exhaust and inlet manifold may be used.

An exhaust pipe which reaches the front of the rear sub-frame must be fitted to all cars.

An effective silencer must be fitted to the exhaust system at all times. (Bosal 230-773 or equivalent is recommended).

The exhaust must be suitably silenced to the satisfaction of the Scrutineer/Steward.

The battery must either be enclosed in a box or covered with rubber (so as to prevent acid leakage) and be securely

fitted behind the driver and be protected by the firewall. (Jelly or dry type batteries are recommended)

The main electrical lead must run separately to the fuel line. A battery isolator switch must be fitted in the earth lead

within easy reach of the driver when strapped in and must be labelled ON/OFF. All electrical wiring must be securely

fixed down.

All cars must be fitted with a well-maintained and efficient braking system. The brakes must work on all four wheels

and a compensator valve must be incorporated in the system. An adjustable bias valve may be used as long as the

system still works on all four wheels.

10” or 12” diameter Mini wheels with maximum 6” width are allowed.

Only road legal tyres are allowed. No racing or competition tyres permitted.

Any tyre which “APPEARS” to contravene these rules may be independently checked for validity.

Only metal, injection moulded plastic or fibreglass seats are allowed. (Where plastic or fibreglass seats are used they

must be supported in a steel frame and accepted as safe by the scrutineers.) Rally type seats with metal frames and

hardboard backs are not allowed. Where seats with integral headrests are used, care must be taken to ensure seat belts fit

correctly. All seats must be adequately padded with fire retardant foam.

The seat must be securely mounted at shoulder height to crossbar or roll cage and bolted securely to the floor.

A 5 point safety harness must be fitted and must be anchored on at least four separate anchor points. (No homemade

harnesses are allowed).

Minimum width of harness straps is 3” (75mm). Width of crutch strap must be minimum 1-1/2” maximum 2”.

It is recommended that the shoulder straps be anchored to the roll cage, NOT the original rear seat belt points to prevent

the straps becoming loose in the event of a rear end collision.

It is recommended that safety belts comprising of separate shoulder, lap and sub-straps be fitted.

The crutch strap must pass through the seat base and be anchored rearward of the leading edge of the seat base.

The sub-strap must be used at all times and all parts must connect to the quick release buckle.

In the case of the NASCAR Lever Latch buckles it is advisable to fit a secondary means of detent to protect overall

sleeves accidentally unhooking buckles during racing.

A small section of tube grip elasticated bandage slid over the hook buckles serves the purpose.

It is strongly recommended that once involved in a serious accident, the harness should be discarded and replaced. The

harness manufacturer’s instructions must be followed regarding this issue. In case of any difference between the two,

the manufacturer’s instructions shall take precedence.

Shoulder pads are strongly recommended.

At all times when on the track a driver must wear a crash helmet. These must be of a minimum standard as directed by

the British Oval Racing Safety Executive (BORSE). These are BS6658/85 Type A, BS6658/85 Type A/FR, FIA 8860-

2004, Snell Foundation SA2000, Snell SA2005, SFI Foundation 31.1 and SFI Foundation 31.2.

The E2205 European Standard Helmet may also be used. These helmets must be constructed of glass fibre or Kevlar.

No thermoplastic or polycarbonate helmets are allowed. The helmet must fit the driver’s head correctly.

Protective goggles or visors must be worn at all times during racing or practice.

Tinted visors are not permitted.

All drivers must wear clean, fire retardant overalls, minimum Proban, at all times when on the track.

Fireproof neck collars are highly recommended, and if used must be marked appropriately.

Fireproof balaclavas are highly recommended, and if used must be marked appropriately.

Fire retardant gloves are MANDATORY, and must be marked appropriately.

On wet meetings, waterproofs may be worn as over garments.

The wearing of protective boots (rather than trainers) is recommended whilst racing.

For cars, which do not have, the seat fitted centrally, a cloth “quick release” window net must be fitted to the driver’s

door; the netting should have holes no larger than 7.5cm or 3” wide.

A fire extinguisher is highly recommended. If fitted, this should be securely mounted (not taped) within easy reach of

the driver. Specification of extinguisher is minimum 1Kg (2.2lbs) either dry powder or CO2 gas, fitted with a sight

gauge. Old type BCF (green) fire extinguishers are not allowed. It is a requirement that all transporters must carry

Large neat numbers a minimum 9” high and 2" brush strokes must be painted black on white on both sides of the car

along with the driver’s name.

A fin type roof number with numbers a minimum 9” high and 2" brush strokes painted black on white may be fitted.

The points champion has the option to use racing number 1 during his/her reign, but the car roof MUST be painted

silver, or a silver stripe added if the roof colour represents other championship wins.

PLAN VIEW

All queries connected with car construction should be directed to Bill Lever on 0115 961 8309 during business hours,

who will be happy to assist you.

The Promoter can be contacted on 01663 741353 during business hours.