This can give a less restricted airflow at higher engine speeds.DOHC with a multivalve design also allows for the optimum placement of the spark plug, which in turn improves combustion efficiency.
Honda later used a similar valvetrain system in their motorcycles, using the term "Unicam" for the concept.
This system uses one camshaft for each bank of cylinder heads, with the cams operating directly onto the inlet valve(s), and indirectly, through a short rocker arm, on the exhaust valve(s).
SOHC designs offer reduced complexity compared with overhead valve designs when used for multivalve cylinder heads, in which each cylinder has more than two valves.
An example of an SOHC design using shim and bucket valve adjustment was the engine installed in the Hillman Imp (four cylinder, eight valve), a small, early-1960s two-door saloon car (sedan) with a rear-mounted aluminium-alloy engine based on the Coventry Climax FWMA race engines.
In an inline engine, this means there is one camshaft in the head, whilst in an engine with more than one cylinder head, such as a V engine or a horizontally-opposed engine (boxer; flat engine) – there are two camshafts, one per cylinder bank.
In the SOHC design, the camshaft operates the valves directly, traditionally via a bucket tappet; or via an intermediary rocker arm.
) Another performance advantage is gained as a result of the better optimised port configurations made possible with overhead camshaft designs.
With no intrusive pushrods, the overhead camshaft cylinder head design can use straighter ports of more advantageous cross-section and length.
The terms "multivalve" and "DOHC" do not refer to the same thing: not all multivalve engines are DOHC and not all DOHC engines are multivalve.
Examples of DOHC engines with two valves per cylinder include the Alfa Romeo Twin Cam engine and the engine of the Jaguar XK6.
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