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PLEASE NOTE ALL NEW RULE CHANGES ARE IN BOLD PRINT Cars, engines and fuel will be checked on a random basis at the end of a meeting for eligibility. When referring to the engine or construction rules and regulations, the principal will always be:- unless permission is specifically granted to make modifications or any variations, nothing may be done to alter or change in any way the standard parts. I.E. Unless these rules state you can do it, you CANNOT do it. Violations will result in an immediate suspension of all racing facilities and any refusal will also result in an immediate suspension. Drivers are reminded that scrutineer checks can be carried out at any time, and most certainly at official championships. If parts are suspected of being illegal make sure you leave them with the promotion if you do not agree, if you refuse it will automatically make the parts illegal.
1. DEFINITION. Group a Hot-Rods are a non-contact formula using suitably modified small family saloon and hatchback cars.
2. WEIGHT LIMIT Warning : Cars can be weighed at any time before, during or after a meeting, without driver. They must always achieve the minimum weight; the adding of fuel or any other liquids is not allowed to achieve this minimum weight. The minimum car weight for rear wheel drive cars is 600Kg and front wheel drive cars is 650Kg. The use of ballast to achieve this weight must be steel plate bolted to the floor. This internal plating must be of equal proportions on both sides and front to rear of the car both in construction and gauge. I.E. If a 10Kg weight is fitted in the front offside footwell, a 10kg weight must also be fitted in the nearside footwell. Bolts of the same size and material must be used to fit the plates, and the bolts must be welded.
3. TYPE OF CAR. You may use any right hand drive steel bodied saloon, coupe or hatchback The body must not be lowered, narrowed or shortened in any way and the floor must be complete upto the front of the rear seats. The rear of the engine must not be further back than the original line of the bulkhead. 4. ENGINES. You may use any four cylinder in-line engine up to a maximum capacity of 1330cc. Vauxhall engines may use a 1mm piston to allow a maximum capacity of 1332cc No twin cam engines and no engine with more than two valves per cylinder. No turbos, no fuel injection, no forced induction of any kind, no dry sump systems, no specially manufactured steel rods or cranks. An effective oil catch tank must be fitted. Apart from these restrictions, lightening, balancing, cam and cylinder head modifications are permitted. Fly wheels are free. 4A. FORD 1600cc CROSSFLOW You may you the above named engine in the following specification only. (a) Nominal bore plus 60 thou overbore. Standard stroke. (b) Block and head may be skimmed. Pistons may not protrude above the block. Pistons may not be skimmed or modified in any way. (c) Camshafts are free, vernier cam wheels allowed. Cam wheels must be driven as original design. Standard rocker gear only to be used. (d) Head. Only 1600cc Crossflow allowed as fitted originally. No modification is allowed. Valves must be standard 1600cc Crossflow. Valve seats may be re-cut. No gas flowing or adding of material to the ports or combustion chamber, no double valve springs allowed. Any single valve spring may be used that fits without any modification (e) Fly wheel and clutch are free. (f) No competition gaskets allowed. (g) Only the standard Bosch or Motorcraft distributor allowed with points and condenser or electronic ignition. Mechanical and vacuum advance may be altered. (h) The charging system. Power steering pumps may be removed, fan belts are free but pulleys must remain standard, with the exception of the bottom pulley which may be steel. (i) Oil coolers may be fitted using a sandwich plate between the oil filter and block. An effective oil catch tank must be fitted. Oil coolers and oil catch tanks must be fitted within the engine compartment. No turbos, fuel injection or forced induction of any kind. No remote oil coolers. (j) Any standard replacement crossflow pistons may be used. No Powermax or high compression pistons allowed. Any make of piston ring may be used providing the number of rings remains the same as standard and no machining of the piston or piston rings apart from gapping is allowed. (k) Blocks may be rebored, honed, sleeved to standard and rebored, surface ground, line bored and edges broken. No other modifications. (l) Crankshaft may be balanced and\or tuftrided with fly wheel and pulleys, no other balancing or lightening allowed. (m) Inlet manifold must be standard and may not be gas flowed or faced to alter the angle of the carburettor. No material may be added to the gas flow area. Water ways may be blanked off but not removed. You may use one standard single choke carburettor, which may be modified and fitted with and adapter ( maximum length 120mm ). After modification, the carburettor orifice must not exceed 1.75 inches or 45mm. If your car was originally fitted with a single twin choke carburettor, this may be used with the following modifications, secondary chokes may be altered from vacuum to open progressive on linkage, all cold starting devices may be removed. Jet may be changed. Replacement spindles with standard screws may be fitted, no polishing or reprofiling allowed, no modification or enlargement of any air or fuel galleries allowed. Floats must not be modified, needle valve must remain standard size. Enrichment or power valve must be fitted and working. Only the standard twin choke carburettor may be used on the Ford 1600 Crossflow. A carburettor adaptor plate mat be fitted upto 1 inch thickness, but the carburettor must occupy its original position.
Free. 7. GEAR BOXES. Free 8. DIFFERENTIALS. Free 9. STRENGTHENING. There is no restriction on welding to strengthen the car. You must cover the headlamp and tail lamp orifices. Wheel arches must be fitted to cover protruding wheels. No sharp edges are to remain on the wings. The following panels may be replaced with Kevlar or fibreglass - front and rear wings, front and rear panels, boots, bonnets and doors, no adding of materials i.e. no tubing, box or angle iron for armouring at the front of the car is allowed. Any panels changed or repaired must be replaced by metal of the same thickness as original. Replacement door sills should be no more than 6 - 8" high. No drilling of holes in the bodywork is allowed with the exception of the side skirts. Aerofoils must not be fitted further forward than the rear axle. The aerofoil must not exceed 12” in height above the roof line and must not exceed 18” long from front to rear.
11. WHEELS AND TYRES. Any one piece wheel may be fitted to a maximum size of 6 x 13. Maximum wheel spacer size permitted is 1\4" all round. The only tyres permitted are the Yokohama 185\60 A021R or 185\70 A021R. FWD cars must have studs fitted on the front wheels. 12. SUSPENSION. Suspension components are free but must remain as original configuration i.e. struts to remain struts and wishbone to remain wishbone. You must also retain a cross member, chassis rails and inner wings. Any bracing fitted within the engine compartment must not protrude further forward than the centre line of the front wheels. The rear of the car may be space framed from the rear seats backwards only.
13. BACK AXLE. Free except no quick change rear ends allowed. No Birdcage axles allowed
14. ROLL CAGE. The minimum requirement is a four poster cage in support of the door pillars and front windscreen pillars made of steel and securely bolted or welded on all joints. The minimum thickness must not be less than 1.25" x 1.25" x 10 gauge tube. Two chicken bars in the drivers and at least one chicken bar in the passengers door is compulsory. Chicken bars must be attached to the roll cage. All roll cages must terminate at least 4" from the back panel. A bar must be fitted in the front windscreen aperture.
15. BRAKES. Must be effective on all four wheels. A parking brake is compulsory. The pedal box must remain in it’s original position. 16. MIRRORS. Interior driving mirrors must be used. If side view mirrors are fitted they must not protrude outside the car. 17. DOORS. The drivers door may be hinged and fitted with a secondary fastening. All other doors must be securely fixed shut. A window net on the drivers side is compulsory and this must be of a manufacturers cloth type material and must be detachable and not fixed to the door.
18. COOLING SYSTEM. All water and oil cooling systems must be contained within the engine compartment Blisters and air scoops are not permitted.
19. FUEL SYSTEM. A maximum of a 4 gallon tank must be fitted behind the driver. The fuel outlet pipe must enter the tank at the top. A vent pipe must be fitted and either incorporate a one way valve or have a pipe attached terminating below the tank. An adequate firewall must exist between the tank and the driver. Fuel lines must be metal and a fuel tap must be fitted within easy reach of the driver.
19A. FUEL. For the full fuel specification please see the separate sheet 20. ELECTRICAL SYSTEM. Batteries must be bolted or clamped in position and completely covered with a rot proof material to prevent acid leakage. All wiring must be fully insulated. Electric starters must be fitted and in working order. Brake lights must be fitted on the rear panel shelf or hung from the roof and totally inside the car. Cars without working brake lights will be excluded from the meeting. Electronic ignition is permitted. An electrical cut out switch must be fitted to the rear near side corner of the car and clearly marked ON\OFF.
21. SAFETY EQUIPMENT. · · Plastic or Polycarbonate helmets (i.e. British, European or Snell) of any type are not permitted. · Helmets must be of a minimum standard as directed by British Oval Racing Safety Executive (B.O.R.S.E). These are BS6658/85 Type A, BS6658 Type A/FR, FIA8860-2004, Snell SA2000, Snell SA2005, SFI Foundation 31.1, or SFI Foundation 31.2. Shatterproof goggles/visors must be worn although tinted visors are not advisable. · Neck braces are recommended. · Fireproof balaclavas are MANDATORY from 2nd January 2007 and must be marked appropriately. · Fire retardant gloves are MANDATORY and must be marked appropriately. · A minimum of 3” (75mm) wide safety belts (1.75” (40mm) sub-strap) are mandatory. This must be a full five point buckle release harness (including NASCAR type) with sub-strap and must be fitted and bolted to the floor and/or the roll cage. Shoulder belts with a sternum protection latch are highly recommended. The sub-strap must be used at all times and all belts must connect to the quick release buckle. In the case of NASCAR lever latch buckles it is advisable to fit a secondary means of detent to prevent overall sleeves accidentally unhooking buckles during racing. A small section of Tubegrip elasticated bandage slid over the hooked buckle serves this purpose. Special attention must be paid to the condition of seat belts and fixings once fitted. An extra bar is to be fitted to roll cage behind drivers seat approx 4” below shoulder height of driver. Your seat belts may be fixed to this bar. The bar is to be of roll cage material specification Following recent research made by leading safety harness manufacturers, new information has been made available with regard to the best way to fit your safety harness, which will further ensure your safety. Please study the diagrams below to ensure your safety harness is fitted correctly. · Drivers must wear bright coloured racing overall type clothing of flame retardant Proban or a high specification material and this must be maintained in a clean and tidy condition in view of the public. N.B. If wet weather clothing is used this must be worn IN ADDITION TO and NOT INSTEAD OF the regulation flame retardant overall type of clothing described above.
· A quick release cloth window net must be fitted to the driver’s door window aperture. The netting should have holes not larger than 7.5cm or 3” wide. It should come down level with the steering wheel, and should be flexible and easily removable separate to the movement of the door. · A 1Kg Dry Powder Gauge Fire Extinguisher is highly recommended and if fitted, this should be in a tube with a spring top and should be within easy reach of the driver. Old type BCF (green) type extinguishers are not allowed. 22. DRIVERS SEAT. A racing seat must be fitted and must incorporate a head restraint and should be bolted or welded to the floor. 23. FINAL PREPARATION. The external painting of the car should be to a high professional standard preferably in bright colours. Any colour scheme is permitted and your name should appear on the sun visor. No childish drawings allowed. Race damage should be repaired after each meeting and painted accordingly 24. NUMBERS. Your racing number should be painted on the doors and in a contrasting colour to your car, your number must also be painted white on black on the rear near side of your roof. 25. ROOF COLOURS. The roof must be completely painted in your correct grade colour. 26. not used. 27. NOISE REDUCTION. Exhaust systems are free but must be fitted and comply with the promotions requirements at all times. If a silencer becomes ineffective during racing or practice, the car will be withdrawn from the event. If exhaust systems pass through the car they must be covered. 28. NOTES. No rear engined cars allowed. The promotion reserves the right to exclude any car that it does not consider to comply within the spirit of the rules, if in doubt ask. The Promotion also reserves the right to exclude any car that it sees as scruffy or unsightly and detrimental to the Formula. 29. TRANSPONDERS. Transponders are mandatory and should be working at all times. They should be fitted 1.8 metres back from the front most position of the car. A hole of at least 6” (150mm) is required in the floor, with the transponder fitted vertically, just below the hole. In the event of a dispute with the transponder result, the Steward of the meeting will make the final decision. Any driver found to have fitted the transponder further forward that the required 1.8 metres will be excluded from the meeting. As an alternative to the 1330 and X-Flow engines PRI are introducing the 1400cc Stock Rod engine rule. The only engines to be allowed are those that are listed at the end of this section and must be built strictly to the regulations laid out below. In time the 1330 and X-Flow engines will be phased out and the 1400cc engine will be the only engine allowed.
ENGINES - 1400CC Engines must be as produced by the manufacturer, two valves per cylinder, i.e. no twin carburettor set ups, where not originally specified. No fuel injection or turbo charging is permitted. It is permitted to use an engine or block assembly from another model of the same manufacturer if all technical specifications are the same. Fuel injected engines may be used – see Inlet and Exhaust Manifold below. Engine mountings to remain standard, with the exception of Front Wheel Drive cars where the top engine mounting (by valve cover) may be solid..
Cylinder Block..... Nominal overboring to a maximum of 0.060” (1.5mm) is permitted. Skimming of the block on the head gasket surface only is permitted. No other modifications to the block are permitted.
Cylinder Head...... The skimming of cylinder head is permitted on head gasket surface. Cylinder heads must remain standard and unworked. A 3 angle cut is permitted, but there must be no machining or fettling either side of the valve seat. The measurements of the angle valve seats must be as manufacturers specifications with valve seat width free. The valve length must remain within standard manufacturers tolerances (i.e. the length as supplied to the industry, not a minimum service length). Eg. Vauxhall 104.25mm-105.35mm, Inlet Valve diameter 38mm and exhaust valve diameter 31mm. Valve springs must remain as standard, and must be the original manufacturer’s part. The following must not be machined, repositioned or modified in any way: valve caps, collets, valve guides, spring seats and valve stem oil seals, with the exception of Corsa/Nova lash caps which may be of competition type. Solid lifters may be fitted. Hydraulic lifters may be welded or modified to be solid and shimmed. Fuel injected engines may be used, but injection inlet manifold must be replaced with a conventional carburettor version within the manufacturer’s range. Only locating holes and gasket may be altered to allow manifold to fit. (Manifolds and carburettors from larger cc version cannot be used.) Peugeot 106 Cylinder heads and rocker gear are not interchangeable.
i) If the oil feed to the cylinder head becomes mis-aligned when head is surfaced it may be re-aligned. ii) Head bolts may be shortened or washers may be used. iii) Bronze valve guides are NOT permitted unless fitted as standard, but it is permitted to use a thin wall bronze sleeve in existing guide. iv) Inlet and exhaust valve seats may be lowered, (i.e. moved away from pistons) but the valve head must sit level with or below the combustion chamber roof.
Pistons................ Manufacturers pistons or original replacement pistons must be used and must not be altered in any way other than for balancing as specified below. Nova/Corsa if a small valve cylinder head is used, it must be with original compression ratio pistons (i.e. 9.4..1), the big valve cylinder head may use 9.4..1, 9.8..1 or 10.0..1.
Camshafts........... The camshaft may be changed to that of a competition type but no other parts may be altered to accept the camshaft other than those permitted within these rules. The only exception to this is for the Vauxhall Nova/Corsa engine where the cambox to cylinder head surface of the cambox may be surfaced (level). Offset dowels, drilling or pinning is permitted. Vernier timing wheel is permitted.
Carburation......... Must remain as standard and although jets and needles are free, they must remain fitted. Trumpets or stubs are not allowed on carburettors. Choke butterflies, cold start equipment and economy devices can be removed. The VV carburettor on CVH engines may be replaced with a Weber 32 IBF. A 32 DHA carburettor is allowed on Kent engine. A 32 DGA or 32 DGR carburettor is permitted on either the CVH or Kent engine. Throttle butterflies may be modified to open together.
Inlet Manifold...... Must be the original manufacturer’s parts if available from the manufacturers range. Water circulation holes may be blanked off.
Distributor........... Must be the standard type. The mechanical and vacuum advance may be altered. The vacuum advance may also be removed. No electronic ignition is permitted unless fitted as standard. Where the engine is not fitted with a distributor as standard and it is not possible to fit a distributor from the same vehicle manufacturer, certain types of Luminition will be allowed to be fitted. (The Renault Clio 1.4 may fit Luminition Kit No C410 ECU. Top line mapped only. Max advance by 3750-RPM ignition may be advanced only; no retarding. Whatever advance figure appears at 3750-RPM must be continued to end of rev range). Rev limiters are allowed.
Balancing............ Balancing is permitted by spot machining only. Spot machining means either hand grind, drill or machine. When balancing pistons and con rods, at least one of each must be as original. The flywheel and clutch assembly may be balanced.
Con Rods............ Any big end bolts may be used, but con rods must not be machined to accommodate them.
Flywheel.............. Lightening of the flywheel is permitted.
Sundry................ The engine must be fitted with a metal catch tank of 1 litre minimum capacity connected to the engine breather system, fitted in the engine compartment. Bottom Crankshaft pulleys are optional.
Sump.................. Standard sumps must be used and can be baffled. Pick-up pipes can be modified within the confines of the sump. No outside alterations are permitted.
TRANSMISSION The gearbox, gearbox mountings and final drive must remain standard, but gears and ratios from the same manufacturer may be interchanged and the gearbox and final drive may be interchanged within manufacturer's range. The differential assembly may be locked by way of welding. All of the above exceptions must be achieved without machining or modification of the standard parts.
Driveshafts.......... Must be the original fitted to make and model and must remain standard. The fitting of spacers is not permitted. Drive shafts from automatic versions are not permitted.
Propshafts........... May be modified or interchanged from manufacturers range.
ENGINES; Citroen AX-1350cc, Citroen Saxo, Fiat Uno-1301 or 1372cc, Ford Fiesta-1392cc, Peugeots 106 & 205-1360cc, Renault Clio-1400cc, Vauxhalls, Corsa-1396cc, Nova-1400cc & Tigra-1400cc ( Run as Nova spec. )
All carburettor/venturi sizes for the above, are to be the original standard part.
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