Toyota has something new up it’s sleeves – Valvematic, an evolution of the VVT-i mechanism which now incorporates continuous valve lift control together with VVT-i’s existing valve timing control. Valvematic also eliminates the need for a throttle valve, instead controlling the volume of intake air using valve lift instead.
According to Toyota, an improvement of 5% to 10% can be seen with fuel efficiency, as well as an improvement of 10% with the power output on a similiar engine displacement comparison. Toyota also mentions reduced CO2 emission as well as improved acceleration responsiveness.
The first Valvematic-equipped engine will be a 2.0 litre model, most likely a replacement for the 145 horsepower 1AZ-FE engine which has been pretty much slotted with different tune levels into all Toyota cars in the C-segment and above. The trademark “Valvematic” was registered by Toyota a few months ago, so alot of people have been expecting this. One of the first few cars to get the new Valvematic 2.0 litre engine are the 2.0 litre versions of the recently launched twin sedans Toyota Allion and Toyota Premio. The 2.0 litre variants are set to debut in Winter 2007.
The new Toyota Valvematic 2.0 litre engine will most likely be christened the 3ZR-FAE, and will put out 158 PS at 6,200rpm and 196Nm at 4,400rpm. Being part of the new ZR engine family, variable valve timing features will be the same as the 2ZR-FE’s Dual VVT-i system – valve timing on both intake and exhaust valves.
Honda also recently announced an engine with continuous valve lift control combined with variable valve timing, a technology it calls AVTEC.
Check out a patent application filed by Toyota in March 2007 by clicking here – I think it is the patent for Valvematic. Be warned though, it’s pretty long.