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Engine displacement is defined as the total Volume of air/fuel mixture an Engine can draw in during one complete engine cycle; it is normally stated in Cubic Centimetre s, Litre s or Cubic Inch es. In a Piston Engine , this is the volume that is ''swept'' as the Piston s are moved from '' Top Dead Centre '' to ''bottom dead centre''. GOVERNMENTAL REGULATIONS In many nations levels of Tax ation on Automobile s have been based on engine displacement, rather than on power output. Displacement is easy to identify and difficult to modify whereas power output must be tested. This has encouraged the development of other methods to increase engine power. There are four major regulatory constraints for automobiles: the European, the British, the Japanese, and the American. The method used in some European countries, and which predates the EU, has a level of taxation for engines over one (1.0) Litre and another at the level of about 100 cubic Inch es, which is approximated to 1.6 litres. The British system of taxation depends upon vehicle emissions for cars registered after 1 March 2001 but for cars registered before this date it depends on engine size. Cars under 1549cc qualify for a cheaper rate of tax {Link without Title} . The Japanese is similar to the European taxation by classes of displacement, plus a vehicle weight tax. In the American system, which includes Canada , Australia and New Zealand , there is not this sort of taxation per engine displacement. In The Netherlands and Sweden , road tax is based on vehicle weight. Displacement is also used to distinguish categories of (heavier) motorbikes with respect to license requirements. In France and some other EU countries, Moped s, usually with a Two-stroke Engine and less than 50 cm3 displacement can be driven with minimum qualifications (previously, they could be driven by any person over 14). This led to all light motorbikes having a displacement of about 49.9 cm3. Some people Tuned the engine by increasing the cylinder bore, increasing displacement; such mopeds cannot be driven legally on public roads since they do no longer conform to the original specifications and may go faster than 45 km/h. Wankel Engine s, due to the amount of power and emissions they create for their displacement, are generally taxed as 1.5 times their actual physical displacement (1.3 litres becomes 2.0, 2.0 becomes 3.0), although actual power outputs are far greater (the 1.3 litre 13B can produce power comparable to a 3.0 V6, and the 2.0 litre 20B can produce power comparable to a 4.0L V8). As such, racing regulations actually use a much higher conversion factor. Example regulations
INCREASE AND DECREASE OF TYPICAL ENGINE DISPLACEMENT IN THE US Once V8 engines became expected on large American cars in the late 1950s , and continuing to the Oil Crisis in the 1970s , there was an engine displacement race in the industry. Firms would put badges on the fenders of cars giving the displacement in cubic inches. This was also a sort of trademark as well. There's a famous Beach Boys song, "409", which refers to any full-size Chevrolet which had an engine displacement, in cubic inches, of that amount, regardless of trim level. This number was not the ''model number'' of the car. In the mid- 1960s , Chrysler offered a V8 engine of 426 cubic inches (6981 cm³) on its Muscle Car s and Pony Car s. Soon Ford came out with one of similar size, which displaced 427 cubic inches (6997 cm³), and hence was named the '427'. Engine sizes eventually grew to 440 Cubic Inches (7210 cm³) in Chrysler s, 500 (8193 cm³) in Cadillac s, 496 (8127 cm³) in Chevrolets, and 462 (7570 cm³) in Lincolns . With the oil shocks of the 1970s, American firms started selling cars with smaller engines. The Chevrolet Vega was initially touted as having an engine of 2300 "cc" (cubic centimetres), given in metric as it equates to 140 cubic inches, which would have been considered laughable to declare in the American market. This also differs from the European convention of two significant figures, which was in the U.S. European car models usually have a number of three digits. In this instance, the numbers are considered trademarks. These two factors in the world marketplace contributed to American cars now getting labeled in the European manner. Engines like that of the Vega would now be called 2.0 (being litres). CONVERSIONS
The big engines listed above are mostly 7.0 litres. The 3.5 litre engines listed on American cars today as being large are much smaller than the 350 cubic inch (5.7 L) engines that once were considered medium size. The 3.5 litre engine is 213 cubic inches. The 1964 Mustang's smallest Ford V8 engine of 289 cubic inches is 4.7 litres. However, modern engines are much more efficient, using such technologies as an ECU , electronic Fuel Injection , and Variable Valve Timing . Also, the engines and the total weight of cars they are fitted in are lighter, so the difference in performance is not as great as might otherwise be supposed. SEE ALSO EXTERNAL LINKS |
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