2013 Technical Regulations

Introduction
The aim of this trophy being to revive the great international Formula 3 races of the 60's. The trophy is for cars which comply with the original regulations of Formula 3 between 1964 and 1970. Any technical feature not used in period should not be used e.g. Ceramic coating pistons, cockpit adjustable anti roll bars and data logging.

Eligible Cars
Single-seaters complying to the international Formula 3 regulation built between 1/1/1964 and 31/12/1970.
Class A: from 01/01/64 to 31/12/65 Side draught engines with the inlet ports at right angles with the cylinder bore and horizontal carburettors only (no downdraught)  fitted with wheels of maximum dimensions: 6.5" X 13") and tyres either AVON ACB9 A37 compound Code numbers Front 7660 Rear 7661, or Dunlop ‘L’ and ‘M’ Section.
Class B: from 01/01/66 to 31/12/70; This includes cars built before 01/0/1966 which have rims exceeding 6.5” and/or downdraught engines.
Scoring and sporting regulations will be identical in class A and B. Trophies will be award for Class A and B based on the points scored during the season.
All cars must to comply with the rules of 1970 Appendix "J" article 95 and current Appendix “K” and must remain in their original period specifications.

Chassis and Bodywork
As original. The points to which the suspension elements are attached to the frame must not differ in dimension or positions from the period specification. All sprung parts of the car must have a minimum ground clearance of 40 mm with the driver on board.
The use of any material which was not in general use during the period is prohibited. E.g. titanium, kevlar, carbon fibre, etc.

Aerodynamic Devices
Any front or rear aerofoils or aerodynamic devices are not permitted as well as any modifications of bodywork which were not originally used in period.

Engines
They have to comply with the requirement of the original Appendix J 1964-1970 Article 295 &296. Engines must have a maximum of 4 cylinders with a maximum capacity of 1000cc and excluding any engines with overhead camshaft/s.
All the carburetted mixture must pass through a throttling restrictor of 36 mm in diameter and 3mm. minimum of thickness which must be placed between the carburettor and the inlet manifold.
Only one carburettor, whatever it number of chokes, may be used.
The use of any material which was not in general use during the period is prohibited. E.g. titanium, kevlar, carbon fibre, etc.
Ignition must be by a distributor with a mechanical centrifugal advance. Multiple spark systems and systems were the timing of the spark is altered electronically are not permitted. The system must contain only a single ignition coil with distribution by the distributor.

Gearbox
As originally defined, with 4 forward gears and a reverse. The use of Hewland MK8 box is permitted. The choice of gear ratios is free. The use of any limited slip or torque biasing differential is not permitted.
It is strongly recommended that safety centralizing shafts are fitted between the drive shafts and the gearbox output shafts to maintain the drive shaft location in the event of a failure of the rotoflex couplings. Please note that this will be mandatory for 2014.

Suspension
As original period specification. Springs and shock absorbers are free but the mountings to the frame must not differ from the dimensions or positions for the period specification.
Dampers which are adjustable in compression and rebound are permitted; the use of damper with external or remote reservoirs is prohibited.

Wheels
Their dimensions will not be able to be more than:
Class A Front and Rear 13″ x 6.5″
Class B
Front: 13" X 9" (Diameter x width)
Rear:  13" X 11" (Diameter x width)

Tyres
Class A
For Cars built prior to December 31st 1965 and fitted with side draught engines:
If fitted with wheel rims 13" diameter and a maximum of 6.5" wide: AVON ACB9 A37compound Code numbers: Front 7660 Rear 7661 or Dunlop ‘L’ and ‘M’ Section.

Class B
For Cars built after December 31st 1965 and/or all cars fitted with downdraft carburettor:
For dry conditions: AVON slick cut to CR65 (dry) pattern, A37 compound, code numbers 7342 and 7343, pattern Ref:H002 and H004 (see pdf document by a click on Ref. number) or Dunlop ‘L’ and ‘M’ Section CR65 204 compound or ‘Post Historic’ 204 compound.
For wet conditions: AVON slick cut to (wet) pattern, A37 compound, code numbers Front 7714 Rear 7715, pattern Ref: W002 and W005 (see pdf document by a click on Ref. number), or Dunlop ‘L’ and ‘M’ Section CR65 204 compound or ‘Post Historic’ 204 compound.

Brakes
As originally period specification with dual hydraulic circuits.

Weight
The minimum weight is 400kg. The minimum weight is that of the car in running order i.e. with all lubrication and cooling liquids but without fuel.
Note from App ‘K’
The ballast of a removable type is prohibited. If ballast is require it may be added as solid and unitary blocks and they must be securely fixed by means of a tool and offer the opportunity of being sealed on should the officials entrusted with the scrutineering of the car deem It necessary.

Fuel
Only usual commercial fuel is authorized. The characteristics will not be able to exceed 102.0 RON and 90.0 MON

Safety
The cars must comply with the safety requirements of the current Appendix "K” Article 5. Extinguishers must comply with Appendix J articles 273.7.3
It is recommended that a plumbed in extinguisher is fitted.