QRCCRA > The Cars > 8th Scale

8th Scale Rules

1. 1/8th IC ON-ROAD TECHNICAL SPECIFICATIONS

1.1 The engine may have a total capacity of not more than 3.5 cubic centimetres/0.214 cubic inches. No tolerance allowed. Homologated mufflers and homologated inlet noise silencer boxes (INS box) must be used. Each individual car must not produce more than 85 decibels, measured at ten (10) metres distance and one (1) metre high at full throttle. AARCMCC definition of a noise level is always final.

1.2 The fuel tank, including filter and fuel pipes up to the carburettor may hold a maximum of 125 millilitres/4.23 fluid ounces. No loose inserts allowed. Any tank found to be illegal (over 125 millilitres/4.23 fluid ounces) after a heat or final shall be removed from the car and inspected for a second time after an initial ‘cool down’ period of fifteen (15) minutes. This ‘cool down’ period is only necessary in the case of temperatures above 20 degrees C / 68 degrees F.

1.3 Overall dimensions:

Wheel base 270 - 330 mm

Maximum overall width 267 mm

Maximum overall height 190 mm (except aerial)

1.4 Tyres:

Maximum width front 37 mm

Maximum width rear 64 mm

Tyres must be black, except for writing on sidewalls.

1.5 Rims: The rim's diameter must not exceed 54 mm An edge to reinforce the rim of 2 mm thickness and 3 mm height on the inside (car side) is allowed. Flange diameter maximum 60 mm. Any fixing bolts or other equipment installed in the wheel rim must not extend beyond the exterior of the wheel rim. The wheel rim must not extend more than 1.5 mm from the exterior of the tyre.

1.6 All cars will be equipped with brakes and a clutch in such a manner that the car may be held stationary with the engine running.

1.7 Only IFMAR homologated pipes are allowed. The pipes used on the car have to bear their homologation number during the entire championship and their measurements (both internally and externally) have to conform with those on the homologation sheet issued by IFMAR. The IFMAR Approved Muffler List, with detailed drawings, must be available in Technical Control. Additional copies of the IFMAR Approved Muffler List must be available to each participant, if requested.

The outlet or tailpipe of the muffler must project horizontally or downward. No upward or vertical exhaust outlets are allowed. The first cone on all homologated mufflers may be reduced by a maximum of 8 mm (length). The outlet pipe may have a minus tolerance of 2 mm (length).

1.8 The front of the car must be equipped with a bumper in such a manner that it will minimise a wound in the case of it entering into contact with other participants or members of the public. The bumper must be made from a flexible material with all corners and sharp edges rounded off. The contour of the bumper will follow the contour of the body with which it is being used. At no point may the bumper protrude more than 5 mm/0.20 in. in front of the body.

1.9 If a rear bumper is fitted, it must finish no more than 10 mm behind the rear wheels.

1.10 If a roll-over bar is built in, it must be placed behind the driver or just behind the imaginary driver’s position.

1.11 The aerial must be made from a flexible material in such a manner that it will bend completely under the weight of an inverted car. Metallic aerials must have the free end protected.

1.12 Bodies must be a one-eighth scale authentic reproduction of sports cars or prototype cars in full scale racing participating in FISA's, IMSA's or CANAM's official sport classes. There will be an allowance of 10% tolerance in all dimensions.

1.13 Only bodies that are recognised and approved by IFMAR will be allowed.

1.14 The body must be made from a flexible material and painted properly.

1.15 A realistic driver's figure (minimum helmet and shoulders) made to l/8th scale and painted in a minimum of three(3) colours must be fixed at the normal place in the body. The head may not be amputated to make way for the fuel filler cap or any other element. The driver need not be fitted under a closed body.

1.16 All bodies must have the front and rear sides cut out for the wheels if the original was so designed. The radius of the cut-out must not exceed the tyre by more than 13 mm.

1.17 The windscreen must not be cut out. In closed bodies, a hole of maximum 6.5 square centimetres/1 square inch for cooling is allowed to be cut out in the front of the windscreen The windscreen may be painted in a realistic transparent colour.

1.18 Side windows and rear window may be opened.

1.19 No wheels, tyres or rims of the car may extend outside the body shell, as viewed from above.

1.20 Cut-outs in the body that were not in the original full scale version will be allowed for the following:

l - The cylinder head and air filter must follow their contour and have a maximum of 10 mm clearance on all sides

2 - The aerial hole will be no larger than 10 mm in diameter

3 - The radio switch hole will be no larger than 13 mm in diameter

4 - Cut-out for the fuel filler cap will follow the contour with a maximum of 10 mm in gap between the body and the filler cap as viewed from above.

5 - The hole for the exhaust pipe must follow the contour of the above piece with a maximum of 10 mm in gap between the body and the exhaust outlet

6 - The slot for the roll-over bar should be no more than 10 mm in width. The bar should not protrude more than 38 mm above the body and not exceed a total height of 190 mm from the ground

1.21 A spoiler/wing which conforms to AARCMCC regulations may be fitted.

1.22 Spoiler/wing sizes for sports cars/prototypes:

Maximum width 267 mm

Maximum length 77 mm

Maximum height 191 mm

Maximum angle 45 degrees.

1.23 Fuel:

Fuel may only contain Methanol, oil/lubricant and nitro-methane (with a maximum of 25% measured in volume). To implement this rule, Organisers will provide the appropriate Serpent/EFRA fuel check system at Technical Inspection. Random fuel tests will be made during the entire championship. Samples and counter samples will be collected for analysis and any competitor found to be using any substance other than those mentioned above will be disqualified and any race result obtained will be null and void. Further punishment to be determined by AARCMCC, such as a ban from future racing.

1.24 The minimum weight limit of the cars is 2525(weight includes timing transponder allowance). The weight limit will be checked with the cars being ready to race including timing transponder but with empty tank. The weight will be checked by a set of digital electronic scales and can be done at any time during the meeting, i.e. before the start of a heat, sub-final or final or after the end of either. An approved test weight must be provided for checking calibration of the digital electronic scales.

1.25 The car shall be measured for the width by placing it on a baseboard equipped with two side rails of 25.4 mm in height, spaced 267 mm apart. Constructed in such a way that the car can roll freely between them. Base board and rails must be constructed of high quality material, suitably stiffened to prevent distortion. The car must roll freely between the rails with any steerable wheel set in the straight ahead position, irrespective of the compression or extension of the suspension. The car shall be measured for length and height in a similarly constructed box of internal dimensions 637 x 267 mm which includes provision for checking the maximum height. Measurement of the wheel base may be made by simple measurement of axle centre distance but the Race Director should be prepared to make more exact checks in case of doubt or protests. It is suggested that the wheels are removed and the wheel spindles firmly placed on V-blocks whilst accurate measurements are made. It is the responsibility of the driver to ensure that his/her car complies with the regulations at all times it is on the track and the organiser may check any car, at any time during the championship, for compliance with the regulations. On checking immediately after a race, if a car is found to be under the minimum weight or has incorrect dimensions, positive proof of race damage may prevent disqualification.

1.26 The maximum carburettor size will be 9.00 mm

1.27 Technical restrictions: (Not allowed)

4 wheel brakes (no independently controlled braking on the front wheels is allowed)

liquid cooled engines

hydraulic systems

more than 2 servos

no more than 3-speed transmissions.

1.28 Driver Aids - The use of traction control devices, active suspension devices and any steering control aided by gyroscopes/’G’-force sensors is strictly forbidden. Sensors are only allowed for the purpose of passive data recording and not for adjusting the performance of the car whilst in motion. It is the object of this rule to ensure that the AARCMCC sanctioned events be a test of driver skill.