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The result was a water-cooled version with barrels and cylinder heads cast in pairs, and fitted with enclosed valves. All exhaust ports now faced rearwards. Initially a thermo siphon design with a radiator on each side of the front frame downtubes, an impeller type water pump was soon added to the left side of the crankshaft to further aid cooling.
A third engine was the Williamson Flat Twin made by Douglas with cyclecars in mind but produced for the Williamson Motor Company to use in their motor cycles since 1912. This was an 8 hp engine of 964cc, 85mm bore and 85mm stroke. [8] Initially water cooled, from 1913 it was also available air-cooled.
At the end of the 1920s they also started producing engines for stationary use, with the first model being the water-cooled WX11 and in 1933 the air-cooled Mar-vil. Villiers engines were also used in lawn mowers, for example the 147 cc engine was used in the Atco mowers of the 1920s and in 1931 it was joined by a 98 cc Villiers engine, known as ...
Although designed separately from the Taunus engine, the Essex also was a 60-degree V4 with water cooling, overhead valves, and designed for use in front-engined cars/vans. The Porsche 919 Hybrid LMP1 racing car used in the 2014–2017 seasons used a 2.0 L (122 cu in) 90-degree turbocharged V4 engine that was mid-mounted.
A Honda Super Cub engine. The most popular motorcycle in history, with over 100 million produced. A motorcycle engine is an engine that powers a motorcycle.Motorcycle engines are typically two-stroke or four-stroke internal combustion engines, but other engine types, such as Wankels and electric motors, have been used.
A pit bike is a small motorcycle, used primarily for recreational purposes, stunt riding and motocross racing.Pit bikes are characterised by small, air-cooled engines, and are rarely used for professional racing, instead being intended for use in the pit lanes of racing events.
In 1912, Humber produced a light car called the Humberette with a Humber-made V-twin side-valve engine of 998cc. The engine had a directly attached clutch, 3-speed gearbox and prop shaft output to a rear differential. A water cooled version of this engine was made available in 1914, but WW1 ended Humberette production in 1915. [25]
Some design details were carried over from a steam-powered prototype made by the Hildebrand brothers in 1889, including the water tank shaped to form the rear mudguard and the connecting rods of the engine driving the rear wheel directly. The water tank was repurposed to supply water to the cooling jackets surrounding the cylinders. [7]