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).
Dual - overhead cam (DOHC) cylinder heads with high - flow intake and exhaust ports, in combination with variable - valve timing (VVT), allow
optimum volumetric and combustion efficiency over the full speed and load range.
The 3.6 - liter V - 6 engine design features DOHC and high - flow intake and exhaust ports, that in combination with variable - valve timing via dual independent cam phasing, allow
optimum volumetric and combustion efficiency over the full speed and load range.
Not exact matches
Unfortunately, the frequency, magnitude and timing of these pulses varies with speed, so the
volumetric efficiency of an engine with fixed valve timing will only be
optimum at one speed.