This can be accomplished by throttling the engine with the intake valves. It has the benefit you mentioned - that of improved charge tumble and reduced cylinder wall wetting; both of which improve partial throttle burn efficiency and reduce emissions. It also has the benefit of reducing...
A solenoid based electronic valve system is unlikely in that the force required (~800 N @ 5000 rpm) is impractical for solenoids at that speed. Solenoids are inductve and as they get bigger (stronger) their time constant also gets slower meaning that high speed and high force are mutually...
Anyone familiar with FI pneumatic poppet valve springs? I'm looking for a predictive model that includes nonlinear effects. Also, how is the pressure maintained?
