Fuel economy and reduced emissions continue to be large factors in engine technology. Therefore the continued development of VVA will become necessary on virtually all gasoline engines, and must be adopted on diesel engines. The benefits achieved with the applications of this technology include: fuel economy, reduced emissions, improved power, performance, reliability and durability.
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Introduction to Engine Valvetrains
Emission Control and Fuel Economy for Port and Direct Injected SI Engines
Advanced Three-way Catalysts