Valvematic, Valvetronic, MultiAir & more
Next, we change how much, and for how long, the valves stay open. The best way to alter the amount and duration of opening is to do it continuously over a wide range.
A throttle is unnecessary. Instead, if you use the inlet valves to control airflow, by altering how far they open, this removes a major obstruction to airflow.
Carmakers had spent years trying to design systems that can open the valve electronically or hydraulically, free from the camshaft’s limits. They eventually achieved this goal in 2009, creating the MultiAir engine that could pull energetically from low speeds and rev like a racing car without compromising on performance.
Now comes the clever part: an electric solenoid valve bleeds off part of the oil flow in the hydraulic pipe as required, up to 60 times a second, leaving the rest to open the inlet valve. It’s probably the most significant breakthrough in piston engine design in the last 100 years.