The 2CV was powered by an air-cooled boxer-twin engine. The Citroën 2CV, produced from 1948 to 1990, was one of the first front-wheel drive cars to use a flat engine. : 38–44 and several Jowett Cars models from 1910 to 1937. Other early uses of flat-twin engines were 1903-04 Ford Model A, the 1904-1905 Ford Model C, the 1905-1906 Ford Model F. Lanchester used this engine design until 1904. It also had the torque reaction of one crankshaft cancel the torque reaction of the other, cancelling torque reaction in the engine.
Each piston was also connected to the other crankshaft by two thinner connecting rods, causing the two pistons to move on the same axis. This engine had an unusual design of two counter-rotating crankshafts, with each piston attached to its crankshaft by a thick connecting rod. In 1900, The Lanchester Engine Company began production of the Lanchester 8 hp Phaeton, which used a flat-twin engine. A year later, his company Benz & Cie unveiled the first flat-twin engine, a boxer design called the "contra engine". The beginnings of the flat-twin engine were in 1896, when Karl Benz obtained a patent for the design. Applications Automobiles Citroën 2CV engine (viewed from rear) This was achieved by using a one-way valve (a leather or rubber flap over a hole in the crankcase), to let air escape the crankcase but not enter it. The Citroën 2CV boxer-twin engine took advantage of this pumping effect to maintain a partial vacuum inside the crankcase, in order to reduce oil leaks when an oil seal malfunctions. This crankcase pumping effect (also found on singles-cylinder engines and 360° parallel-twin engines) is usually addressed by means of a crankcase breather. The boxer-twin configuration can cause pressuring of the crankcase during each inward piston stroke and de-pressurisation during each outward piston stroke, since both pistons are moving inwards or outwards at the same time. This system is distributorless and requires only a single contact breaker and coil for the engine. during both the compression and exhaust strokes). : 27 Wasted spark ignition systemĪ commonly used ignition system is wasted spark, which is a simple ignition system using a double-ended coil firing both spark plugs on each revolution (i.e. The equal and opposite forces in a boxer-twin engine do however generate a rocking couple, due to the offset distance between the pistons along the crankshaft. The evenly spaced firing order also assists in reducing vibration. In a boxer-twin engine, the 180° crankshaft moves the pistons in phase with each other, therefore the forces generated by one piston are cancelled out by the other, resulting in excellent primary balance. Most flat-twin engines use a boxer configuration for the crankshaft and are therefore called "boxer-twin" engines. Typical design Boxer crankshaft configuration
In the Supreme (the later model) all these problems were fixed with a rear-domed piston, crankcase mixers and refined ignition system. They are very sought after as only small numbers were produced, most likely due to ignition- and fuel-related problems in early models. These motors were manufactured in Canada. The Australian lawnmower manufacturer Victa also produced a flat-twin engine push mower from August 1975 to 1980 dubbed the ‘Twin 500’, and later the ‘Supreme’. The flat-twin engine was used in several other cars since, however a more common usage is in motorcycles early models oriented the cylinders in line with the frame, however later models switched to the cylinders being perpendicular to the frame to provide even cooling across both cylinders.įlat-twin engines were also used in several aircraft up until the 1930s and in various stationary applications from the 1930s to the 1960s. The flat-twin design was patented by Karl Benz in 1896 and the first production flat-twin engine was used in the Lanchester 8 hp Phaeton car released in 1900. The most common type of flat-twin engine is the boxer-twin engine, where both pistons move inwards and outwards at the same time. For Soviet radar nicknamed "flat twin", see 5N65 radar.Ī flat-twin engine is a two-cylinder internal combustion engine with the cylinders on opposite sides of the crankshaft.
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