I read all your post with interest, but often feel I don't have experience or knowledge to contribute with anything of value
You obviously have a great ability to free yourself from the conventional thinking around a subject and find truly new workable solutions (that are just not different only to aper novel)
It's great to follow!
Hello Johan ( GIA HARA APO ELLADA ).
Anybody unfamiliar with a subject has the advantage of the “fresh-eye”. The rest are mostly "luck" and "persistence".
This was the case with the MultiAir.
A big OEM ( the FIAT group ) made a great invention that reliably turns the ICE into a digital device.
Think for a moment about the MultiAir from a different viewpoint:
It doesn’t need preparation or motion of mechanical parts.
The ECU sends an electronic pulse “the right moment” to switch on and off the solenoid valve that modifies the valve motion (late opening, early closing, multi-lift, full lift deactivation).
The “right moment” is independently defined for each cylinder, according the program and the feedback from the sensors (high speed oxygen sensor etc).
If you want to retard the “right moment” by three millionths of a second in the third cylinder only, it is OK. The ECU is adequately fast to manage it immediately.
The ECU operates at accuracy and speed impossible for the mechanical systems.
Comparing the valvetronic of BMW to the MultiAir of Fiat is like comparing the old mechanical distributors (those with the “centrifugal” control) with the modern electronic ignition systems.
With the MultiAir the internal combustion engine works like a PC or a laptop.
It took almost a decade and a bigger than FIAT manufacturer from Germany, the Schaeffler-INA, in order to become the MultiAir reliable and cheap and ready for mass production.
When we first saw the intake cam-lobes of the camshaft, we couldn’t believe that two partners of such a size teamed up to come up with such a blunder.
We tried to communicate with them, but “no response” is their policy.
We filed a couple of patents and a prototype Alfa-Romeo car was prepared as proof of concept ( http://www.pattakon....ttakonHydro.htm
The PatAir is better not because we say so, but because it offers more.
Toyota Prius, Mazda SkyActive-G and Nissan Micra DIG-S are three of the most fuel efficient modern engines; all three of them operate on a "limited Miller cycle" and high compression ratio; with conventional technology they achieve at least comparable fuel efficiency with that of the high tech digital MultiAir system of Fiat.
The PatAir offers more than both worlds (i.e. the high compression Miller and the MultiAir) together.