Late Intake Valve Closing
The first variation of continuous variable valve timing involves holding the intake valve open slightly longer than a traditional engine. This results in the piston actually pushing air out of the cylinder and back into the intake manifold during the compression stroke. The air which is expelled fills the manifold with higher pressure, and on subsequent intake strokes the air which is taken in is at a higher pressure. Late intake valve closing has shown to reduce pumping losses by 40% during partial load conditions, as well as decreasing NO emissions by 24%. Peak engine torque showed only a 1% decline, and Hydrocarbon emissions were unchanged.
Read more about this topic: Continuous Variable Valve Timing
Famous quotes containing the words late and/or closing:
“Nowadays most people die of a sort of creeping common sense, and discover when it is too late that the only things one never regrets are one’s mistakes.”
—Oscar Wilde (1854–1900)
“It is closing time in the gardens of the West and from now on an artist will be judged only by the resonance of his solitude or the quality of his despair.”
—Cyril Connolly (1903–1974)