Sentences with phrase «follow cam lobes»

In order to achieve the optimum volumetric efficiency in the lower portion of the engine's operating range, rocker arms are programmed to follow cam lobes that provide low lift and reduced duration (shorter time open with less valve lift).

Not exact matches

Valve float is an adverse condition which can occur at high engine speeds when the poppet valves in an internal combustion engine valvetrain do not properly follow the closure phase of the cam lobe profile.

If the engine is going fast enough, this time is longer than the time it takes for the cam lobe to rotate from «fully open'to «fully closed», so the valve doesn't follow the cam - a gap appears momentarily.

As a result, both intake valves follow a central high - lift, longer - duration cam lobe.