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A dual overhead cam, double overhead cam, or twin-cam engine has two camshafts over each bank of the cylinder head, [1] [2] one for the intake valves and another for the exhaust valves. Therefore there are two camshafts for a straight engine and a total of four camshafts for a V engine or a flat engine.
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
The Peugeot 500 M (1913-1914) was a French racing motorcycle designed by Ernest Henry in 1913. It was a "technical tour de force" as the first motorcycle ever designed with a dual overhead camshaft. It also used a multi-valve cylinder head, with four valves per cylinder. [2] [3]
Single- and double-overhead camshaft (SOHC and DOHC, respectively) engines have overhead camshafts typically operated by chain, belt, gear train or bevel gear drive. The earliest motorcycle engines had exhaust valves operated in the same way as a side-valve engine, but they had overhead intake valves held closed by a weak spring.
In 1914 Henry adapted his automobile engine design for a new 500 cc straight-twin engine racing motorcycle. The Peugeot 500 M racing motorcycle was the world's first motorcycle to use a double overhead camshaft cylinder head; the twin camshafts were driven by a cascade of gears between the cylinders, and used 4 valves per cylinder. The new ...
The VF1000 is a range of motorcycles produced by Honda from 1984 to 1988. The VF1000 is named after its V-4 998 cc (60.9 cu in) double overhead cam 16-valve engine. There were three main models in the VF1000 range, the VF1000F (also known as Interceptor), the VF1000R and the VF1000F2.
VTEC was introduced as a DOHC (dual overhead camshaft) system in Japan in the 1989 Honda Integra XSi, [1] which used the 160 bhp (120 kW) B16A engine. The same year, Europe saw the arrival of VTEC in the Honda Civic and Honda CRX 1.6i-VT, using a 150 bhp (110 kW) B16A1 variant.
The Honda VF750F is a street bike designed by Honda from 1983 to 1985. It has an 86 hp (64 kW), liquid-cooled, V4 engine which sports dual overhead cams (DOHC). The V4s were started a year before with the 1982 Honda Magna VF750C and Sabre VF750S [2] but were adapted for the VF750F in 1983 by reducing the six speed transmission to a five speed because of the change from shaft drive to chain.