Fiat Multiair Technology Announced - More Power, Less Fuel, Less Emissions

This is very different from VTEC and other dual camshaft profile systems, as the MultiAir system has very many modes of operation for different driving conditions. VTEC and such have two camshaft profiles, one for low rpm usage and one for high rpm usage.

Huh, just give me a VTEC, and I will pretend I like the new Fiat tech. But I'm sure that Chrysler will like it.

MultiAir is way superior to any other VVT technology on the market. It is the only system which can independently and instantly change the valve timing and opening profile of the valves cylinder by cylinder and stroke by stroke. In other words it can vary from minimal or no opening (idle) to full lift within one engine stroke phase. The biggest merrit of this system however is that it eliminates pumping losses. Any other engine (with or without VVT) constantly wastes 10% of its power by creating a unnecessary pressure drop in the gas manifold (between butterfly valve and cylinder injection valve). The cylinder has to ?suck? the air gas mixture into the cylinder creating this pressure drop all the way from cylinder through supply manifold to the butterfly valve. Once the supply valve closes it will just burn the gas trapped inside the cylinder while the created pressure drop in the supply manifold is given away in the following phase. Multiair eliminates the butterfly valve and all associated friction and pumping losses. It directly uses the injection valves to dose the required air-gas mixture in the cylinder. No more friction and pumping to get air into the cylinder. This is HUGE and unprecedented in internal combustion engine technology.