Twin cam (DOHC)
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Twin cam (DOHC) also known as DOHC (double overhead camshaft). Twin cam refers to an car's engine which has two camshafts per cylinder bank. The two act together as one is responsible for intake valves while the other acts as for exhaust valves. This is more efficient than one cam for both jobs. The idea is to provide improved fuel efficiency and performance. This system is now standard on all modern engines.