Another source of high engine friction is the valve train.

Let's look at all of the different subsystems used in modern engines, beginning with the valve train.

Mechanically, the new engine used an internal rather than external oil line feeding the upper valve train.

The valve train is a dual overhead camshaft configuration with four valves per cylinder.

They consist of pistons, a cylinder block and a head, which contains the valve train.

It came with special heads, valve train, cam, as well as a redesigned intake and exhaust.

As stated above, the valve train is the mechanical system responsible for operation of the valves.

The engine still resembles a Mercedes in many ways, particularly the valve train.

Other changes include a higher compression ratio, a new intake manifold and an extensively modified valve train.

The valve train consists of the valves and a mechanism that opens and closes them.