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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 Revolution Max is a V-twin motorcycle engine from Harley-Davidson. It features double overhead camshafts and liquid cooling. It debuted in the Pan America adventure bike in February 2021. [1] Harley-Davidson has announced this engine will eventually come in sizes ranging from 500cc to 1250cc. [2]
The Harley-Davidson Milwaukee-Eight engine is the ninth generation of "big twin" engines developed by the company, but only Harley's fourth all-new Big Twin in 80 years, first introduced in 2016. These engines differ from the traditional Harley Big Twin engines in that there are four valves per cylinder, totaling eight valves, hence the name.
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.
The valvetrain layout is defined according to the number of camshafts per cylinder bank. Therefore, a V6 engine with a total of four camshafts - two camshafts per cylinder bank - is usually referred to as a double overhead camshaft engine (although colloquially they are sometimes referred to as "quad-cam" engines). [14]
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