NZ Historic Muscle Cars

New Zealand Historic Muscle Cars Inc.

For Vehicle with Engines Larger than 3 Litres

Regulations Comply With MNZ Schedule T&C Manual 34.

Contents

Objectives
Article 1 Identity Classification
Article 2 Interpretations and Definitions
Article 3 Group 1 – Sports and GT Cars up to 31.12.1977. and,
Group 2 – Production Saloon Cars up to 31.12.1977:

Thoroughbred & Classic Car Regulations Objectives:

This schedule is designed to provide a set of regulations for the use of period
production based Sports, Grand Touring, and Saloon Cars in sporting
competition while maintaining the philosophy of the Historic & Classic movement.
Where appropriate, the regulations have been formulated to preserve period
specifications by preventing the application of technology that is inappropriate for
the period depicted. These regulations define the ONLY ALLOWABLE changes
in each vehicle raced, which differ from the catalogued model variant the vehicle
represents.

All vehicles complying with this set of regulations will be given an ‘A’ Certificate of
Description on application to Motorsport New Zealand.

1. Identity Classification:
1.1 Refer to Section Three of this Appendix for details on the Certificate of
Description and for details on vehicle classification.
Note: The onus of proof relating to the appropriate vehicle Certificate of
Description classification rests entirely with the competitor

1.2 The date assigned to a vehicle by a COD or from corroborated information
supplied by the competitor, representing the vehicle’s owner, will be the actual
year of commencement of manufacture of that model, providing that the model is
essentially unchanged as to body and engine and is part of a continuous model
run.
1.3 Once classified, cars may only be re-classified by order of MotorSport NZ. It
is the entrant’s responsibility to prove the eligibility of a car’s specifications as
entered on the Certificate of Description. Any appeal or enquiry regarding
classification status shall be referred to MotorSport NZ.
2. Interpretations and Definitions: In addition to the interpretations detailed in
the National Sporting Code Article 2 and in Article 2.1 of Schedule K, the
following apply to this schedule;
“Grand Touring” or “GT” means a fixed head, performance orientated, two (2)
door vehicle with either two (2) or two plus two (2+2) seating, and
“Homologation” is the term given to the official certification made by the FIA
that a specified minimum number of a specific model has been made on series
production terms, and
“Period” means the era during which a vehicle and/or its components were used
actively in Motorsport Competition, and

“Saloon” means a two (2) or four (4) door vehicle not falling into either the
Sports or GT categories including the convertible variations of same, and
“Sports Car” means a two (2) seat open vehicle and the fixed head variations of
the same, and
“Standard” means a vehicle identifiable as belonging to a production series,
with a minimum model run of 100 identical units, distinguishable by external
general lines of the bodywork and identical mechanical construction of the
engine, transmission and suspension to the wheels, and
“Works” means a defined specification for a vehicle and/or its components as
prepared by the vehicle manufacturers officially designated race team.
“Make”: means the part(s) produced within that manufacturer’s model range. A
change in model is determined by a change in model number/classification
instigated by the manufacturer.
“Substitute Part”: means a completely new part that retains the same
appearance, material and dimensions of the original item fitted to that particular
make of vehicle
“Free”: Means the application of technology that is appropriate for the period
depicted.

3. Group 1 – Sports and GT Cars up to 31.12.1977. and,
Group 2 – Production Saloon Cars up to 31.12.1977:

3.1 Eligibility:
Important Note:

The following regulations have been formulated to preserve period specifications
by preventing the application of technology that is inappropriate for the period
depicted. The objectives stated at the start of this Schedule should be considered
in relation with all of the following articles.

(1) A vehicle may be modified to utilize the period variations within the
manufacturer’s model body shell.
(2) All other modifications are strictly prohibited except as specified elsewhere in
this schedule.
(3) The onus of providing proof of eligibility remains the responsibility of the
competitor.
Note: It is the responsibility of the competitor to be able to show conclusively that
the vehicle contains only specifications of its original build and modifications that
pertain to that particular build and only one other model of the same
manufacturer’s range.

(4) Scrutineering audits: These will be conducted to the requirements of
Appendix Six Schedule ‘AA’ or Schedule A where appropriate.

3.2 Exterior: The vehicle shall be smartly maintained with all exterior trim in
place. All Panels, Bumpers, Moldings, Spoilers, etc must be made of the original
material, as per the “Standard” Series Production Vehicle. EG Steel Panels must
be retained if originally fitted. Any part of the arch/wing pressing folded into the
wheel arch may be deformed, but not removed, to give clearance to the tyres.

3.3 Interior:
(1) Carpets maybe removed.
(2) Front seats may be replaced with recognised competition seats.
(3) It is recommended that competition seatbelts also be fitted. Full harness seat
belts must be fitted in compliance to MSNZ Rules

(4) Any non-visible devices such as heater and fan may be removed or
substituted.
(5) Solid wood-rimmed steering wheels are prohibited, even when they are
original fitment. The steering wheel may be replaced with a sports or competition
wheel.
(6) Rear seats may be removed for the fitment of a roll cage. Rear Interior can be
in “Works” configuration, but must smartly maintained
(7) Roof lining may be removed
(8) Original dash panel and door panels must be retained

3.4 Glazing: Fitting of a laminated windscreen is strongly recommended. All
other glazing may be substituted with alternative transparent material, but original
fixing medium must be used including operating mechanisms. Rear screens to
be minimum 5 mm thick

3.5 Chassis:
(1) The “standard” chassis must retain full structural integrity, i.e. removal of any
material or component which was originally designed as load-bearing is strictly
prohibited.
(2) Addition of stiffening material and components is permitted.
(3) Transmission tunnels and inner guards to remain as “standard”. Tunnels may
be modified for shifter/lever clearance only. Shifter must retain original position.

3.6 Engine:
(1) Cylinder head(s) and block must be of “Standard” material and may be
changed to one of the same make and model range but cylinder heads must be
of the same internal valve angle, port spacing and. Aftermarket “Substitute Part”
block and heads are allowed. Alloy heads and blocks are not allowed unless
original fitment and meet the “Standard” criteria.
(2) “Period” Components, as undertaken in New Zealand, and components as used in Australia assembled 6 Cylinder vehicles are allowed ,but engine
block must remain “Standard”.
(3) Maximum Capacity of any engine used in HMC competition is 468 cubic
inches (7700cc).
(4) Dry Sump Oiling systems are permissible.
(5) Computerised engine management systems are prohibited unless “Standard”
fitment.
(6) Supercharging and Turbocharging are Prohibited
(7) Front Engined Vehicles Only

 
3.7 Exhaust: The exhaust system is free provided that the maximum permitted
decibel limit as specified in Appendix Two Schedule A is not exceeded.

3.9 Differential: May be changed provided the type of suspension is not
affected. Ratios may be changed. Limited slip and locked differentials are
permitted.

3.10 Suspension: Original componentry must be retained. Additional
components may be fitted as required providing in all cases the “Standard” type
of suspension and chassis mounting points are retained. Additional “Period”
chassis or suspension modifications may be used. Shock absorbers are to be
“Period” double action, with modern triple and quadruple action shock absorbers
not allowed. The steering box is to remain in the original position.

3.11 Brakes: Brakes are “Free” except that all disc and drum friction surfaces
must be made from ferrous material. Aftermarket “Substitute Part” two piece “bolt
together” fixed mounted aluminum calipers allowed. Modern mono-block calipers
are not permissible. Cooling ducts may be fitted. Master Cylinder or Cylinders are
to remain in the original position

3.12 Wheels: Wheels are “Free” provided they fit within the bodywork and they
have an appearance suitable for the “period” of that model. 1” increase in
diameter from “standard” for 15" is allowed. all others can use 15"

3.13 Tyres: Only tyres for legal road use in New Zealand may be used. (ie DOT
approved road tyres having 1.5 mm minimum tread depth across 75% of the
width of the tyre and around the entire circumference at the tyre, Drag Race DOT
Tyres not allowed, nor is the practice of skimming the tyres. Aspect ratio is
restricted to 50% minimum Non DOT goodyear Blue Streak 15" G7 period Vintage Race Tyres
Allowed in following sizes 5.50,6.00,7.00, and 8.00

To help understand the “Interpretations and Definitions” for a particular
Vehicle, please contact Tony Roberts 09-280-6584, E-Mail
tony@hamptondowns.com or Dale Mathers 07-578-8852, dmathers@xtra.co.nz