S.I. No. 293/1985:

ROAD VEHICLES (REGISTRATION AND LICENSING) (AMENDMENT) REGULATIONS, 1985.

ROAD VEHICLES (REGISTRATION AND LICENSING) (AMENDMENT) REGULATIONS, 1985.

The Minister for the Environment in exercise of the powers conferred on him by sections 5, 6 and 12 of the Roads Act, 1920 and sections 1 and 3 of the Finance (Excise Duties) (Vehicles) Act, 1952 (No. 24 of 1952) hereby makes the following regulations:--

1. (1) These regulations may be cited as the Road Vehicles (Registration and Licensing) (Amendment) Regulations. 1985.

(2) These Regulations and the Road Vehicles (Registration and Licensing) Regulations, 1982 shall be construed as one and may be cited together as the Road Vehicles (Registration and Licensing) Regulations, 1982 and 1985.

(3) These Regulations shall come into operation on the 1st day of October, 1985.

2. The Road Vehicles (Registration and Licensing) Regulations, 1982 ( S.I. No. 311 of 1982 ) shall be amended as follows:--

( a ) by the substitution for sub-paragraph (b) (ii) of article 3 of the following subparagraph:--

"(ii) the cylinder capacity of the engine expressed in cubic centimetres, maximum seating capacity, or weight unladen (as the case may be) in respect of which duty has been paid;",

( b ) by the substitution for article 30 of the following article:--

Calculation of cylinder capacity of engines.

"30. (1) For the purposes of any rate of duty specified in the schedule to the Act of 1952. the cylinder capacity of the engine of any vehicle shall be--

( a ) in the case of any vehicle deriving its motive power wholly from an internal combustion engine;

(i) in the case of a single cylinder engine, the cylinder capacity attributable to the cylinder;

(ii) in the case of an engine having two or more cylinders, the sum of the cylinder capacities attributable to the separate cylinders;

and the cylinder capacity attributable to any cylinder of an internal combustion engine shall be--

(I) In the case of a cylinder having a single piston, the product expressed in cubic centimetres of the square of the internal diameter of such cylinder measured in centimetres and the distance through which the piston associated with that cylinder moves during one-half of a revolution of the engine crankshaft measured in centimetres multiplied by 0.7854; and

(II) in the case of a cylinder having more than one piston, the sum of the products expressed in cubic centimetres of the square of the internal diameter of each part of the cylinder in which a piston moves measured in centimetres and the distance through which the piston associated with that diameter moves during one-half of a revolution of the engine crankshaft measured in centimetres multiplied by 0.7854.

( b ) in the case of any vehicle deriving its motive power wholly from a rotary-piston engine the total cylinder capacity attributable to the rotary-pistons calculated in respect of each rotary-piston by dividing the displacement volume attributable to the rotary-piston by half the number of output shaft revolutions for one revolution of the rotary piston;

( c ) in the case of any vehicle deriving its power wholly from a steam engine, the effective heating surface of the boiler supplying steam to such engine, at the rate of one cubic centimetre for every 22.3 square centimetres in such heating surface, and the effective heating surface shall be taken to be--

(i) in the case of a boiler having horizontal or approximately horizontal tubes, the whole of that surface of the tubes which is exposed to the flame or hot gases;

(ii) in the case of a boiler having vertical or approximately vertical tubes, half of that surface of the tubes which is exposed to the flame or hot gases.

(2) In this article:--

"rotary-piston engine" means an engine with one or more rotary-pistons, each of which produces power by acting on an eccentric which is directly attached to an output shaft;

"output shaft" means a shaft to which a rotary-piston is directly coupled without gearing or other similar devices intervening;

"displacement volume attributable to the rotary-piston" means the difference between the maximum and minimum volumes, expressed in cubic centimetres, of a single working chamber based on a working flank of the rotary-piston multiplied by a number of working flanks of the rotary-piston.".

GIVEN under the Official Seal of the Minister for the Environment this 4th

day of September, 1985.

LIAM KAVANAGH,

Minister for the Environment.

EXPLANATORY NOTE.

These Regulations amend the Road Vehicles (Registration and Licensing) Regulations, 1982 ( S.I. No. 311 of 1982 ) so as to provide for the substitution of references to "cubic centimetres" for references to "horsepower" as a measurement of the cylinder capacity of engines for motor tax purposes. The regulations implement EEC Directive 76/770 on the approximation of the laws of Member States relating to units of measurement.