Eligibility Rules

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ELIGIBILITY OF CARS Edition 5 Awaiting Update from ESC

Eligibility Rules 2015
PERMITTED MODIFICATIONS FOR EDWARDIAN, VINTAGE AND PVT CARS ONLY
 
CHASSIS
 

Standard	Modified	Special
Must be to the original specification.	Must be of the original type. Local stiffening is allowed. Wheelbase may be altered but must be as offered by the manufacturer in the relevant period for that model. Position and method of fixing of the axles, engine, steering box and gearbox may not be changed. Position and height of the radiator may not be changed.	Must be from an eligible car or of the same design. Position and method of fixing of axles, engine, gearbox, steering box and radiator can be changed. Wheelbase may be altered. Stiffening or boxing is allowed, but this may change the period definition of the car.

 
 
SPRINGS
 

Standard	Modified	Special
Must be to the original specification.	Must be of the original type.	Must be appropriate to the period of the car.

 
 
BRAKES
 

Standard	Modified	Special
Must be to the original specification.	Must be of the original kind and size. Hydraulic conversion allowed. Separate front and rear systems may be linked. Transmission brakes may be rendered inoperative. Front brakes may be fitted, but Edwardian cars converted to front wheel brakes will be reclassified as Vintage.	May be modified, converted to hydraulic or increased in size. Transmission brakes may be removed or rendered inoperative. Front brakes may be fitted, but Edwardian cars converted to front wheel brakes will be reclassified as Vintage.

 
 
 
FRONT AXLE
 

Standard	Modified	Special
Must be to the original specification.	Must be of the original type. A different axle of the correct period may be fitted for the purpose of fitting front wheel brakes but this must not alter the track.	Must be from an eligible car

 
 
 
REAR AXLE
 

Standard	Modified	Special
Must be to the original specification with axle ratio as catalogued by the manufacturer for that model in the relevant period.	Must be of the original type. Axle ratio may be altered.	Must be from an eligible car. Axle ratio may be altered.

 
 
ENGINE
 

Standard	Modified	Special
Must be to the original specification. Up to 5% rebore is permitted which will not alter the nominal capacity. Larger rebore not allowed. Stroke may not be altered. Non standard oil coolers not allowed. Oil filters may be fitted or altered.	Must be of the original type. Up to 5% rebore is allowed without altering the nominal capacity. Any greater rebore and the car must run at its actual capacity. Such rebore must be within the limits of the original block casting. The stroke may not be altered. Oil filters or coolers may be fitted or altered. Camshafts, valves, connecting rods, crankshaft, lubrication system, may be altered but such modifications must properly reflect the period of the car.	Must be from an eligible vehicle (pre 1931 commercial, motorcycle, marine, aeroplane or dirigible engines may be used.). Rebore up to 5% is permitted without altering the nominal capacity. Any greater rebore will mean that the car must run at its actual capacity. Such rebore must be within the limits permitted by the original block casting. Firing order may be altered. All modifications must properly reflect the period of the car.

 
 
 IGNITION
 
 
 
CARBURETTORS
 

Standard	Modified	Special
Must be to the original specification, number, size and configuration.	Number of carburettors may be increased by one. Kind and size of carburettor may be changed.	Any number or kind of pre 1941 designed carburettors may be used.

 

An alternative period carburettor of the same size as the original and appropriate to the year of the car may be accepted if fitted on the existing manifold in the same orientation as the original.  Specific approval must be obtained.

S.U. or Amal carburettors with separate float chambers may be used but if of a post 1940 design must be concealed within the bodywork. No other make of post 1940 carburettor may be used.

 
 
FUEL DELIVERY SYSTEM
 

Standard	Modified	Special
Must be of the original type. Pre-war type electromechanical SU fuel pumps are accepted as standard vintage.	Any pre 1941 system is allowed.	Any pre 1941 system is allowed.

 
 
MANIFOLDS
 

Standard	Modified	Special
Must be to the original specification.	May be altered but must be of a design and appearance strictly appropriate to the period and type of car, e.g.; modern tuned length exhaust systems are not allowed. Exhaust manifolds must be within the bonnet, unless otherwise provided by, or available from, the manufacturer in the period.	May be altered, but must be of design and appearance appropriate to the period of the car, e.g.; modern tuned length exhaust systems are not allowed.

 
 
 
 
SUPERCHARGERS
 

Standard	Modified	Special
Must be to the original specification.	Must be of an original kind. (See below)	Must be of a pre-1941 style. The use of any supercharger not listed in Appendix A must be specifically approved in writing by the Committee.

 
 It is mandatory that, where a member wishes to use a supercharger that requires modifications according to our rules or a newly manufactured supercharger, they must seek acceptance and clarification from the Club prior to fitment.  If a supercharger built in period but not listed below is available it is essential that approval is sought. Any approval given for the use of a supercharger not listed, applies to that specific application only and does not create any precedent for a similar supercharger to be fitted to any other car.
 
Acceptable as  Vintage
 
Vane Type: 
·         Cozette                  
·         Zoller
·         Power Plus
               
Roots type:
·         Marshall
·          Amherst Villiers
 
Plus car manufacturers' own period superchargers and other units proved to have been manufactured in the Vintage period.
 
Acceptable as PVT
 
Vane type
·         Centric
·         Arnott
·         Shorrock:requires modification to place the inlet on opposite side to exhaust
           
Roots type:
·         Wade: requires modification to inlet and exhaust to disguise the parallelogram opening.  (There are different models of Wade supercharger. On some the modifications needed are so extensive as to make this impracticable without a new case).  Advice should be sought.
·         Godfrey
·         Volumex: requires modification to remove plastic pipes and fit suitable aluminium end plates.
 
Plus car manufacturers' own period superchargers and other units proved to have been manufactured in the period.
 
Replica Cozette, Zoller, Power Plus and Centric, together with certain Roots design superchargers of new manufacture, are permitted on Vintage and PVT cars, as appropriate, with prior Committee approval.
 
 
Acceptable Supercharger Drives
·         Vintage: Chain, dog, gear (bevel, spiral, pinion) or shaft.           
·         PVT: As Vintage plus one or more seperate v-belts, epicyclic, quill shaft and hydraulic. Toothed and multi v-belts cannot be used for this or any other purpose.
 
 
SUPERCHARGER DRIVE
 

Standard	Modified	Special
Must be to the original specification. (See above)	Must be of an original kind. (See above)	Vintage cars may use chain, gear or direct drive. PVT cars may also use one or more seperate v-belts

 
 
 
 
 
GEARBOX
 

Standard	Modified	Special
Must be to the original specification with original ratios.	Must be of the original type. Ratios may be changed.	Must be from an eligible car and retain the original method of engagement. Ratios may be changed.

 
 
 
CLUTCH
 

Standard	Modified	Special
Must be to the original specification.	Any clutch may be used.	Any clutch may be used.

 
 
SHOCK ABSORBERS
 

Standard	Modified	Special
Must be to the original specification.	Must be of the original kind and appropriate to the period of the car. Additional dampers of the appropriate period may be fitted.	Any number or kind of pre-1941 design of shock absorber is allowed.

 
 
BODYWORK
(The use of glass reinforced plastic for bodies is not allowed in any circumstance)
 

Standard	Modified	Special
Must be to the original specification or a strictly accurate copy of an original fitted to the model in the period. It must be constructed in the original manner and with original materials.	Must be appropriate to the make and model of the car. Uncharacteristic lightweight style or construction will change the classification of the car.	Appearance, construction of the body and the appearance and construction of the detail equipment must be appropriate to the period of the car.

 
 
 
WINGS
(The use of glass reinforced plastic for wings is not allowed in any circumstance)
 

Standard	Modified	Special
Must be to the original specification.	Alternative wings may be fitted but of a type appropriate to the make, model, style and period of the vehicle.	Must be appropriate to the period of the vehicle.

 
 
 
 
 
 
 
 
WHEELS
 

Standard	Modified	Special
Must be to the original specification. Rims for beaded edge or straight sided lyres may be changed to well-base in accordance with Appendix B.	Must be of the original type. The diameter may be increased or decreased by 10%. The rim section may be increased by ½" except that for racing cars competing in race or speed events the rim section may be increased by 1". Wheels may also be altered in size to allow the use of well-base tyres (See Appendix B).	Vintage cars up to 1100cc capacity may use wheels of 400mm/16" or larger. Other vintage cars must use 18" or larger wheels. PVT cars must use wheels of 400mm or larger. Max rim section 5½".  Post-1930 Austin 7 racing cars may use wheels of 15" diameter, rim width 4".

 
Beaded-edge or straight-sided tyres may be changed for well-base tyres as show below:
 

Original Size Beaded edge/Straight side	Minimum  Rim Diameter Well-base	Max. Section Well-base Tyre
26 x 3 710 x 90, 28 x 4 760 x 90, 810 x 90 30 x 3, 30 x 3½ 815 x 105, 820 x 120 880 x 120, 32 x 4½ 895 x 135	19 inch 19 inch 21 inch 21 inch 21 inch 21 inch 21 inch	3.50 inch 4.50 inch 4.75 inch 4.75 inch 5.25 inch 5.25 inch 6.00 inch

 

For other beaded edge or straight sided tyre sizes enquire for well base equivalent

 

For a Modified or Special car based on a type originally fitted with beaded-edge or straight-sided tyres, the well-base equivalent of those tyres, shown above, should be used to calculate allowable modifications.

 
 
WHEEL OFFSET (TRACK)
 

Standard	Modified	Special
Must be to the original specification.	Must not be more than I" greater than the original track of the model concerned.	Must not be more than 2" greater than is the standard track for the axle concerned.

 
 
TYRES
 

Standard	Modified	Special
Must be to the original specification. But a change from beaded edge or straight sided tyres to well-base types is allowed in accordance with Appendix B.	There must not be more than 1" difference in section from the original specification. Change from beaded edge or straight sided tyres to well-base is allowed in accordance with Appendix B.	15" tyres, where permitted, must not be more than 145mm or 4.5 nominal section. Other tyres must not be more than 7" section.
Notes: 1.       Radial Tyres are not permitted. 2.       Motor cycle tyres of low profile or of triangular cross section are not permitted.  There are special regulations for three wheelers available from the Office. 3.       For Race and Speed events, tyres listed on the Club’s approved tyre list are the only ones that may be used. Such list will be published with event regulations. 4.       Tyres on cars taking part in competitive Trials must have a tread pattern such that the blocks are not more than 10mm deep nor more than 10mm apart laterally or circumferentially. There must not be an uninterrupted lateral gap between the side blocks.  Off-road, trail, trial, enduro or town and country types of tyre are not permitted.  5.       The enhancing of the tread pattern by re-cutting is not allowed. 6.      Radial tyres are not permitted except for certain post vintage models as agreed by the Committee. 7.      No tyre compound softer than Dunlop 204 or equivelant may be used.

 
DYNAMO and STARTER
 
 
 
OVERDRIVES
This paragraph does not apply to cars fitted with a high ratio "overdrive" top gear as standard.
eg MX Series Bentley 4¼
 

Standard	Modified	Special
Overdrive units may not be fitted.	Overdrives, if fitted, must be capable of being disconnected for competition and must always be so disconnected to the scrutineer's satisfaction.	Overdrives, if fitted, must be capable of being disconnected for competition and must always be so disconnected to the scrutineer's satisfaction.

 
 
 
FUEL